CVE-2026-50170: Angular: Information Leak via Default Caching of Credentialed Requests in HttpTransferCache

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-22 · updated 2026-07-09
Weakness: CWE-524

Description

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.

Affected products

angular: through 18.2.14; from 19.0.0 before 19.2.23; from 20.0.0 before 20.3.22; from 21.0.0 before 21.2.15; 22.0.0-next0, 22.0.0-next1, 22.0.0-next10, 22.0.0-next11, 22.0.0-next12, 22.0.0-next2 (+9) — fixed in 19.2.23, 20.3.22, 21.2.15

How to fix

Upgrade to a fixed version: angular 19.2.23, 20.3.22, 21.2.15. Check the vendor advisory for mitigations.

References

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