Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 22.0.0-rc.2, 21.2.15, 20.3.22, and 19.2.23, 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. However, 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. This vulnerability is fixed in 22.0.0-rc.2, 21.2.15, 20.3.22, and 19.2.23.
Angular: Information Leak via Default Caching of Credentialed Requests in HttpTransferCache
Problem type
Affected products
angular
>= 22.0.0-next.0, < 22.0.0-rc.2 - AFFECTED
>= 21.0.0-next.0, < 21.2.15 - AFFECTED
>= 20.0.0-next.0, < 20.3.22 - AFFECTED
>= 19.0.0-next.0, < 19.2.23 - AFFECTED
<= 18.2.14 - AFFECTED
References
https://github.com/angular/angular/security/advisories/GHSA-q6f4-qqrg-jv6x
https://github.com/angular/angular/pull/67964
GitHub Security Advisories
GHSA-q6f4-qqrg-jv6x
@angular/common: Information Leak via Default Caching of Credentialed Requests in HttpTransferCache
https://github.com/advisories/GHSA-q6f4-qqrg-jv6xA 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.
However, 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.
Impact
Successful exploitation allows an unauthenticated attacker to obtain sensitive, user-specific information of other authenticated users. This occurs when:
- The SSR-rendered HTML containing the cached private data is stored in a shared cache (e.g., CDN, reverse proxy).
- Subsequent requests for the same page receive the cached HTML containing the first user's private data.
Attack Preconditions
- SSR and Hydration Enabled: The Angular application must be configured to use Server-Side Rendering and hydration (e.g., using
provideClientHydration()). - 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. - 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.
Patches
- 22.0.0-rc.2
- 21.2.15
- 20.3.22
- 19.2.23
JSON source
https://cveawg.mitre.org/api/cve/CVE-2026-50170Click to expand
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