CVE-2026-50170High▾ Twilight@angular/common: Information Leak via Default Caching of Credentialed Requests in HttpTransferCache
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 7.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via GHSA
0.3%
0.3% → 0.4%
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.
Successful exploitation allows an unauthenticated attacker to obtain sensitive, user-specific information of other authenticated users. This occurs when:
provideClientHydration()).withCredentials: true) during the initial server-side render.@angular/common >= 22.0.0-next.0, < 22.0.0-rc.2@angular/common >= 20.0.0-next.0, < 20.3.22@angular/common >= 19.0.0-next.0, < 19.2.23@angular/common <= 18.2.14@angular/common >= 21.0.0-next.0, < 21.2.15Upgrade to a patched release:
@angular/common 22.0.0-rc.2@angular/common 20.3.22@angular/common 19.2.23@angular/common 21.2.15Connected by shared product, vendor, weakness, or advisory.
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