{"id":"CVE-2026-50170","aliases":["GHSA-q6f4-qqrg-jv6x"],"url":"https://o3.security/vulnerability/CVE-2026-50170","summary":"Angular: Information Leak via Default Caching of Credentialed Requests in HttpTransferCache","details":"A vulnerability was discovered in `@angular/common` when Server-Side Rendering (SSR) and hydration are enabled. The `HttpTransferCache` utility optimizes hydration by caching outgoing HTTP requests performed during SSR and transferring the cached state to the client-side application via `TransferState`.\n\nHowever, the caching mechanism fails to inspect the `withCredentials` flag or the `Cookie` header of outgoing requests. As a result, credentialed, user-specific responses may be cached by default in the shared `TransferState` payload. When these responses are serialized into the HTML, any caching layer (such as a CDN, reverse proxy, or shared server cache) that caches the SSR-rendered HTML page could inadvertently cache and leak one user's private data to other users, leading to a high-severity information disclosure vulnerability.\n\n### Impact\n\nSuccessful exploitation allows an unauthenticated attacker to obtain sensitive, user-specific information of other authenticated users. This occurs when:\n\n* The SSR-rendered HTML containing the cached private data is stored in a shared cache (e.g., CDN, reverse proxy).  \n* Subsequent requests for the same page receive the cached HTML containing the first user's private data.\n\n### Attack Preconditions\n\n* **SSR and Hydration Enabled:** The Angular application must be configured to use Server-Side Rendering and hydration (e.g., using `provideClientHydration()`).  \n* **Credentialed Requests during SSR:** The application must perform HTTP requests that require user-specific authentication (using cookies or `withCredentials: true`) during the initial server-side render.  \n* **Shared Caching:** The application's HTML responses must be cached by a shared caching layer (CDN, reverse proxy, or server-side cache) without proper cache-control headers to distinguish authenticated users.\n\n### Patches\n- 22.0.0-rc.2\n- 21.2.15\n- 20.3.22\n- 19.2.23","published":"2026-06-22T15:39:08.877Z","modified":"2026-08-12T03:51:48.177278753Z","cvss":null,"epss":{"score":0.00425,"percentile":0.35671,"asOf":"2026-09-06"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"@angular/common","fixedVersion":"22.0.0-rc.2"},{"ecosystem":"npm","name":"@angular/common","fixedVersion":"20.3.22"},{"ecosystem":"npm","name":"@angular/common","fixedVersion":"19.2.23"},{"ecosystem":"npm","name":"@angular/common","fixedVersion":null},{"ecosystem":"npm","name":"@angular/common","fixedVersion":"21.2.15"}],"fix":{"url":"https://github.com/angular/angular/pull/67964","label":"angular/angular#67964"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50170.json"},{"type":"ADVISORY","url":"https://github.com/angular/angular/security/advisories/GHSA-q6f4-qqrg-jv6x"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50170"},{"type":"FIX","url":"https://github.com/angular/angular/pull/67964"},{"type":"PACKAGE","url":"https://github.com/angular/angular"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:48.177278753Z"}}