{"id":"GHSA-q6f4-qqrg-jv6x","summary":"@angular/common: 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","aliases":["CVE-2026-50170"],"modified":"2026-07-17T21:12:03.542565467Z","published":"2026-06-15T16:51:53Z","database_specific":{"cwe_ids":["CWE-524"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-06-15T16:51:53Z","nvd_published_at":"2026-06-22T18:16:42Z"},"references":[{"type":"WEB","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":"WEB","url":"https://github.com/angular/angular/pull/67964"},{"type":"PACKAGE","url":"https://github.com/angular/angular"}],"affected":[{"package":{"name":"@angular/common","ecosystem":"npm","purl":"pkg:npm/%40angular/common"},"ranges":[{"type":"SEMVER","events":[{"introduced":"22.0.0-next.0"},{"fixed":"22.0.0-rc.2"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-q6f4-qqrg-jv6x/GHSA-q6f4-qqrg-jv6x.json"}},{"package":{"name":"@angular/common","ecosystem":"npm","purl":"pkg:npm/%40angular/common"},"ranges":[{"type":"SEMVER","events":[{"introduced":"20.0.0-next.0"},{"fixed":"20.3.22"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-q6f4-qqrg-jv6x/GHSA-q6f4-qqrg-jv6x.json"}},{"package":{"name":"@angular/common","ecosystem":"npm","purl":"pkg:npm/%40angular/common"},"ranges":[{"type":"SEMVER","events":[{"introduced":"19.0.0-next.0"},{"fixed":"19.2.23"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-q6f4-qqrg-jv6x/GHSA-q6f4-qqrg-jv6x.json"}},{"package":{"name":"@angular/common","ecosystem":"npm","purl":"pkg:npm/%40angular/common"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"18.2.14"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-q6f4-qqrg-jv6x/GHSA-q6f4-qqrg-jv6x.json"}},{"package":{"name":"@angular/common","ecosystem":"npm","purl":"pkg:npm/%40angular/common"},"ranges":[{"type":"SEMVER","events":[{"introduced":"21.0.0-next.0"},{"fixed":"21.2.15"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-q6f4-qqrg-jv6x/GHSA-q6f4-qqrg-jv6x.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"}]}