diff --git a/tradein-mvp/backend/app/api/v1/admin.py b/tradein-mvp/backend/app/api/v1/admin.py
index 07a08672..c5df222a 100644
--- a/tradein-mvp/backend/app/api/v1/admin.py
+++ b/tradein-mvp/backend/app/api/v1/admin.py
@@ -373,6 +373,56 @@ async def geocode_missing(
     }
 
 
+def _cian_verify_state_error(state: dict[str, Any] | None) -> HTTPException | None:
+    """Маппинг исхода cian_session_svc.verify_session() на HTTP-ответ админки.
+
+    verify_session() возвращает 4 разных исхода (см. докстринг сервиса) плюс успех —
+    их нельзя схлопывать в один "cookies invalid", иначе бан по IP выглядит так же,
+    как протухшие куки, и человек в момент инцидента перезаливает заведомо валидные
+    куки вместо починки egress/прокси (инцидент 2026-08-10).
+
+    Sentinel'ы сравниваются через `is`, НЕ `==` — так требует докстринг verify_session.
+
+    Возвращает None, если state — это успешно распаршенный state dict (в т.ч. случай
+    "успех, но userId не найден" — этот случай caller должен обработать отдельно).
+    """
+    if state is cian_session_svc.VERIFY_BAN_SENTINEL:
+        return HTTPException(
+            status_code=503,
+            detail=(
+                "Cian заблокировал наш IP (HTTP 403, TLS/bot-fingerprint ban). "
+                "Куки, скорее всего, валидны — блокировка не про них. "
+                "Нужно чинить egress: проверить SCRAPER_PROXY_URL и баны в "
+                "scrape_proxy_source_bans. Перезаливать куки бесполезно. "
+                "(CIAN_PROXY_URL — мёртвая переменная, снята в #2616.)"
+            ),
+        )
+    if state is cian_session_svc.VERIFY_SOURCE_UNAVAILABLE_SENTINEL:
+        return HTTPException(
+            status_code=503,
+            detail=(
+                "Cian временно недоступен (5xx или сетевой сбой при проверке кук). "
+                "Повторите проверку позже. Куки не трогать — источник просто не ответил."
+            ),
+        )
+    if state is cian_session_svc.VERIFY_MARKUP_CHANGED_SENTINEL:
+        return HTTPException(
+            status_code=500,
+            detail=(
+                "Cian изменил вёрстку/схему страницы — auth-state не найден/не "
+                "распарсился (scraper_kit.cian_state_parser.extract_state, MFE "
+                "header-frontend). Нужен инженерный фикс парсера, перезалив кук "
+                "проблему НЕ решит."
+            ),
+        )
+    if state is None:
+        return HTTPException(
+            status_code=401,
+            detail="Куки протухли или сессия разлогинена на cian.ru — перезалейте куки.",
+        )
+    return None
+
+
 @router.post("/scrape/cian/upload-cookies", status_code=200)
 async def upload_cian_cookies(
     cookies: dict[str, str],
@@ -405,15 +455,21 @@ async def upload_cian_cookies(
         )
 
     state = await cian_session_svc.verify_session(cleaned)
-    if state is None:
-        raise HTTPException(
-            status_code=401,
-            detail="Cookies invalid or session not authenticated on cian.ru",
-        )
+    verify_error = _cian_verify_state_error(state)
+    if verify_error is not None:
+        raise verify_error
+    assert state is not None  # narrowed by _cian_verify_state_error above
 
     user_id = state.get("user", {}).get("userId")
     if not user_id:
-        raise HTTPException(status_code=400, detail="Authenticated state missing userId")
+        raise HTTPException(
+            status_code=400,
+            detail=(
+                "Cian подтвердил аутентификацию (state распарсился), но userId в "
+                "ответе не найден — структура state неожиданная, куки тут ни при "
+                "чём, смотрите server logs."
+            ),
+        )
 
     cian_session_svc.save_session(db, account_user_id=int(user_id), cookies=cleaned)
     return {"ok": True, "userId": user_id, "cookieCount": len(cleaned)}
@@ -480,15 +536,21 @@ async def cian_auto_login(
         )
 
     state = await cian_session_svc.verify_session(cleaned)
-    if state is None:
-        raise HTTPException(
-            status_code=401,
-            detail="Logged in but session not authenticated (cookies rejected by cian.ru)",
-        )
+    verify_error = _cian_verify_state_error(state)
+    if verify_error is not None:
+        raise verify_error
+    assert state is not None  # narrowed by _cian_verify_state_error above
 
     user_id = state.get("user", {}).get("userId")
     if not user_id:
-        raise HTTPException(status_code=400, detail="Authenticated state missing userId")
+        raise HTTPException(
+            status_code=400,
+            detail=(
+                "Cian подтвердил аутентификацию (state распарсился), но userId в "
+                "ответе не найден — структура state неожиданная, куки тут ни при "
+                "чём, смотрите server logs."
+            ),
+        )
 
     cian_session_svc.save_session(db, account_user_id=int(user_id), cookies=cleaned)
     return {"ok": True, "userId": user_id, "cookieCount": len(cleaned)}
@@ -500,6 +562,12 @@ async def test_cian_auth(
 ) -> dict:
     """Проверить что текущие сохранённые Cian cookies ещё валидны.
 
+    reason различает 5 исходов (см. cian_session_svc.verify_session докстринг):
+    "banned_403" — куки, вероятно, ОК, блокирован IP; "source_unavailable" —
+    Cian недоступен, куки ни при чём; "markup_changed" — вёрстка Cian сменилась,
+    нужен фикс парсера; "session_expired_or_invalid" — куки реально протухли;
+    "no_session_in_db" / "encryption_key_not_configured" — конфигурация/данных нет.
+
     Returns: {"authenticated": bool, "userId": <int|null>, "reason": <str|null>}
     """
     if not settings.cookie_encryption_key:
@@ -510,10 +578,14 @@ async def test_cian_auth(
         return {"authenticated": False, "userId": None, "reason": "no_session_in_db"}
 
     state = await cian_session_svc.verify_session(cookies)
+    if state is cian_session_svc.VERIFY_BAN_SENTINEL:
+        return {"authenticated": False, "userId": None, "reason": "banned_403"}
+    if state is cian_session_svc.VERIFY_SOURCE_UNAVAILABLE_SENTINEL:
+        return {"authenticated": False, "userId": None, "reason": "source_unavailable"}
+    if state is cian_session_svc.VERIFY_MARKUP_CHANGED_SENTINEL:
+        return {"authenticated": False, "userId": None, "reason": "markup_changed"}
     if state is None:
         return {"authenticated": False, "userId": None, "reason": "session_expired_or_invalid"}
-    if state.get("_ban"):
-        return {"authenticated": False, "userId": None, "reason": "banned_403"}
 
     user_id = state.get("user", {}).get("userId")
     return {"authenticated": True, "userId": user_id, "reason": None}
diff --git a/tradein-mvp/backend/tests/test_admin_cian_session_endpoints.py b/tradein-mvp/backend/tests/test_admin_cian_session_endpoints.py
new file mode 100644
index 00000000..884a7c8a
--- /dev/null
+++ b/tradein-mvp/backend/tests/test_admin_cian_session_endpoints.py
@@ -0,0 +1,290 @@
+"""Offline tests для Cian cookie-session admin-эндпоинтов (#инцидент 2026-08-10).
+
+cian_session_svc.verify_session() возвращает 5 разных исходов (state dict / None /
+VERIFY_BAN_SENTINEL / VERIFY_SOURCE_UNAVAILABLE_SENTINEL / VERIFY_MARKUP_CHANGED_SENTINEL)
+и раньше admin.py проверял только `if state is None`, из-за чего реальный бан по IP
+(403) и недоступность источника (5xx) выглядели как "куки протухли" — человек в
+момент инцидента перезаливал заведомо валидные куки вместо починки egress/прокси.
+
+Покрытие 3 эндпоинтов (db/verify_session/BrowserFetcher мокаются, NO live network/DB),
+зеркалит паттерн test_domclick_admin_apis.py (dependency_overrides[get_db] + TestClient):
+  - POST /api/v1/admin/scrape/cian/upload-cookies
+  - POST /api/v1/admin/scrape/cian/auto-login
+  - GET  /api/v1/admin/scrape/cian/test-auth
+"""
+
+from __future__ import annotations
+
+import os
+
+os.environ.setdefault("DATABASE_URL", "postgresql+psycopg://test:test@localhost:5432/test")
+
+from unittest.mock import AsyncMock, MagicMock, patch
+
+import pytest
+from fastapi import FastAPI
+from fastapi.testclient import TestClient
+
+from app.services.cian_session import (
+    VERIFY_BAN_SENTINEL,
+    VERIFY_MARKUP_CHANGED_SENTINEL,
+    VERIFY_SOURCE_UNAVAILABLE_SENTINEL,
+)
+
+
+@pytest.fixture
+def client() -> TestClient:
+    from app.api.v1 import admin as admin_module
+    from app.core.db import get_db
+
+    app = FastAPI()
+    app.include_router(admin_module.router, prefix="/api/v1/admin")
+
+    def fake_db():
+        yield MagicMock()
+
+    app.dependency_overrides[get_db] = fake_db
+    return TestClient(app)
+
+
+_UPLOAD_URL = "/api/v1/admin/scrape/cian/upload-cookies"
+_AUTOLOGIN_URL = "/api/v1/admin/scrape/cian/auto-login"
+_TEST_AUTH_URL = "/api/v1/admin/scrape/cian/test-auth"
+
+_RAW_COOKIES = {"DMIR_AUTH": "abc", "_CIAN_GK": "def"}
+_AUTHENTICATED_STATE = {"user": {"isAuthenticated": True, "userId": 102963817}}
+_AUTHENTICATED_STATE_NO_USERID = {"user": {"isAuthenticated": True}}
+
+
+# ── POST /scrape/cian/upload-cookies — пять исходов verify_session ────────────
+
+
+def test_upload_cookies_ban_returns_503(client: TestClient) -> None:
+    """403 TLS/bot ban → 503, текст говорит чинить прокси, НЕ перезаливать куки."""
+    with (
+        patch("app.api.v1.admin.settings.cookie_encryption_key", "test-key"),
+        patch(
+            "app.api.v1.admin.cian_session_svc.verify_session",
+            new=AsyncMock(return_value=VERIFY_BAN_SENTINEL),
+        ),
+    ):
+        resp = client.post(_UPLOAD_URL, json=_RAW_COOKIES)
+    assert resp.status_code == 503
+    detail = resp.json()["detail"]
+    assert "заблокировал" in detail
+    assert "прокси" in detail or "egress" in detail
+    assert "бесполезно" in detail
+    # Текст обязан называть ЖИВУЮ переменную: инцидент 2026-08-10 — правка мёртвой
+    # CIAN_PROXY_URL не давала эффекта, реальный egress задаётся SCRAPER_PROXY_URL.
+    assert "SCRAPER_PROXY_URL" in detail
+
+
+def test_upload_cookies_source_unavailable_returns_503(client: TestClient) -> None:
+    """5xx/сеть → 503, текст говорит повторить позже, куки не трогать."""
+    with (
+        patch("app.api.v1.admin.settings.cookie_encryption_key", "test-key"),
+        patch(
+            "app.api.v1.admin.cian_session_svc.verify_session",
+            new=AsyncMock(return_value=VERIFY_SOURCE_UNAVAILABLE_SENTINEL),
+        ),
+    ):
+        resp = client.post(_UPLOAD_URL, json=_RAW_COOKIES)
+    assert resp.status_code == 503
+    detail = resp.json()["detail"]
+    assert "недоступен" in detail
+    assert "позже" in detail
+
+
+def test_upload_cookies_markup_changed_returns_500(client: TestClient) -> None:
+    """200 но auth-state не распарсился → 500, текст указывает на фикс парсера."""
+    with (
+        patch("app.api.v1.admin.settings.cookie_encryption_key", "test-key"),
+        patch(
+            "app.api.v1.admin.cian_session_svc.verify_session",
+            new=AsyncMock(return_value=VERIFY_MARKUP_CHANGED_SENTINEL),
+        ),
+    ):
+        resp = client.post(_UPLOAD_URL, json=_RAW_COOKIES)
+    assert resp.status_code == 500
+    detail = resp.json()["detail"]
+    assert "вёрстк" in detail
+    assert "перезалив" in detail
+
+
+def test_upload_cookies_expired_returns_401(client: TestClient) -> None:
+    """None → 401, текст просит перезалить куки (единственный случай re-upload)."""
+    with (
+        patch("app.api.v1.admin.settings.cookie_encryption_key", "test-key"),
+        patch(
+            "app.api.v1.admin.cian_session_svc.verify_session",
+            new=AsyncMock(return_value=None),
+        ),
+    ):
+        resp = client.post(_UPLOAD_URL, json=_RAW_COOKIES)
+    assert resp.status_code == 401
+    assert "перезалейте" in resp.json()["detail"]
+
+
+def test_upload_cookies_success_missing_userid_returns_400(client: TestClient) -> None:
+    """Успешный state, но без userId → 400 с уточнением что куки тут ни при чём."""
+    with (
+        patch("app.api.v1.admin.settings.cookie_encryption_key", "test-key"),
+        patch(
+            "app.api.v1.admin.cian_session_svc.verify_session",
+            new=AsyncMock(return_value=_AUTHENTICATED_STATE_NO_USERID),
+        ),
+    ):
+        resp = client.post(_UPLOAD_URL, json=_RAW_COOKIES)
+    assert resp.status_code == 400
+    detail = resp.json()["detail"]
+    assert "userId" in detail
+    assert "куки тут ни при" in detail
+
+
+def test_upload_cookies_success_saves_and_returns_200(client: TestClient) -> None:
+    with (
+        patch("app.api.v1.admin.settings.cookie_encryption_key", "test-key"),
+        patch(
+            "app.api.v1.admin.cian_session_svc.verify_session",
+            new=AsyncMock(return_value=_AUTHENTICATED_STATE),
+        ),
+        patch("app.api.v1.admin.cian_session_svc.save_session") as mock_save,
+    ):
+        resp = client.post(_UPLOAD_URL, json=_RAW_COOKIES)
+    assert resp.status_code == 200
+    body = resp.json()
+    assert body["ok"] is True
+    assert body["userId"] == 102963817
+    mock_save.assert_called_once()
+    _, kwargs = mock_save.call_args
+    assert kwargs["account_user_id"] == 102963817
+
+
+# ── POST /scrape/cian/auto-login — тот же маппинг после успешного browser-login ──
+
+
+def _mock_browser_fetcher(raw_cookies: dict[str, str]) -> MagicMock:
+    fetcher = AsyncMock()
+    fetcher.__aenter__ = AsyncMock(return_value=fetcher)
+    fetcher.__aexit__ = AsyncMock(return_value=None)
+    fetcher.login = AsyncMock(return_value=raw_cookies)
+    return fetcher
+
+
+def test_auto_login_ban_returns_503(client: TestClient) -> None:
+    """Browser login прошёл, но verify_session ловит 403 ban → 503, не "куки протухли"."""
+    with (
+        patch("app.api.v1.admin.settings.cookie_encryption_key", "test-key"),
+        patch("app.api.v1.admin.settings.cian_login_email", "user@example.com"),
+        patch("app.api.v1.admin.settings.cian_login_password", "secret"),
+        patch(
+            "app.api.v1.admin.BrowserFetcher",
+            return_value=_mock_browser_fetcher(_RAW_COOKIES),
+        ),
+        patch(
+            "app.api.v1.admin.cian_session_svc.verify_session",
+            new=AsyncMock(return_value=VERIFY_BAN_SENTINEL),
+        ),
+    ):
+        resp = client.post(_AUTOLOGIN_URL)
+    assert resp.status_code == 503
+    assert "заблокировал" in resp.json()["detail"]
+
+
+def test_auto_login_success_saves_and_returns_200(client: TestClient) -> None:
+    with (
+        patch("app.api.v1.admin.settings.cookie_encryption_key", "test-key"),
+        patch("app.api.v1.admin.settings.cian_login_email", "user@example.com"),
+        patch("app.api.v1.admin.settings.cian_login_password", "secret"),
+        patch(
+            "app.api.v1.admin.BrowserFetcher",
+            return_value=_mock_browser_fetcher(_RAW_COOKIES),
+        ),
+        patch(
+            "app.api.v1.admin.cian_session_svc.verify_session",
+            new=AsyncMock(return_value=_AUTHENTICATED_STATE),
+        ),
+        patch("app.api.v1.admin.cian_session_svc.save_session") as mock_save,
+    ):
+        resp = client.post(_AUTOLOGIN_URL)
+    assert resp.status_code == 200
+    assert resp.json()["userId"] == 102963817
+    mock_save.assert_called_once()
+
+
+# ── GET /scrape/cian/test-auth — reason различает все пять исходов ────────────
+
+
+def test_test_auth_ban_reason(client: TestClient) -> None:
+    with (
+        patch("app.api.v1.admin.settings.cookie_encryption_key", "test-key"),
+        patch("app.api.v1.admin.cian_session_svc.load_session", return_value=_RAW_COOKIES),
+        patch(
+            "app.api.v1.admin.cian_session_svc.verify_session",
+            new=AsyncMock(return_value=VERIFY_BAN_SENTINEL),
+        ),
+    ):
+        resp = client.get(_TEST_AUTH_URL)
+    assert resp.status_code == 200
+    body = resp.json()
+    assert body["authenticated"] is False
+    assert body["reason"] == "banned_403"
+
+
+def test_test_auth_source_unavailable_reason(client: TestClient) -> None:
+    with (
+        patch("app.api.v1.admin.settings.cookie_encryption_key", "test-key"),
+        patch("app.api.v1.admin.cian_session_svc.load_session", return_value=_RAW_COOKIES),
+        patch(
+            "app.api.v1.admin.cian_session_svc.verify_session",
+            new=AsyncMock(return_value=VERIFY_SOURCE_UNAVAILABLE_SENTINEL),
+        ),
+    ):
+        resp = client.get(_TEST_AUTH_URL)
+    assert resp.status_code == 200
+    assert resp.json()["reason"] == "source_unavailable"
+
+
+def test_test_auth_markup_changed_reason(client: TestClient) -> None:
+    with (
+        patch("app.api.v1.admin.settings.cookie_encryption_key", "test-key"),
+        patch("app.api.v1.admin.cian_session_svc.load_session", return_value=_RAW_COOKIES),
+        patch(
+            "app.api.v1.admin.cian_session_svc.verify_session",
+            new=AsyncMock(return_value=VERIFY_MARKUP_CHANGED_SENTINEL),
+        ),
+    ):
+        resp = client.get(_TEST_AUTH_URL)
+    assert resp.status_code == 200
+    assert resp.json()["reason"] == "markup_changed"
+
+
+def test_test_auth_expired_reason(client: TestClient) -> None:
+    with (
+        patch("app.api.v1.admin.settings.cookie_encryption_key", "test-key"),
+        patch("app.api.v1.admin.cian_session_svc.load_session", return_value=_RAW_COOKIES),
+        patch(
+            "app.api.v1.admin.cian_session_svc.verify_session",
+            new=AsyncMock(return_value=None),
+        ),
+    ):
+        resp = client.get(_TEST_AUTH_URL)
+    assert resp.status_code == 200
+    assert resp.json()["reason"] == "session_expired_or_invalid"
+
+
+def test_test_auth_success(client: TestClient) -> None:
+    with (
+        patch("app.api.v1.admin.settings.cookie_encryption_key", "test-key"),
+        patch("app.api.v1.admin.cian_session_svc.load_session", return_value=_RAW_COOKIES),
+        patch(
+            "app.api.v1.admin.cian_session_svc.verify_session",
+            new=AsyncMock(return_value=_AUTHENTICATED_STATE),
+        ),
+    ):
+        resp = client.get(_TEST_AUTH_URL)
+    assert resp.status_code == 200
+    body = resp.json()
+    assert body["authenticated"] is True
+    assert body["userId"] == 102963817
+    assert body["reason"] is None