Reversible One-Way Hash in Angular - CVE-2026-54266
Published: September 11, 2026
Vulnerability identifier: #VU149010
CSH Severity: High
CVSS v4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-54266
CWE-ID: CWE-328
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information and poison application state.
The vulnerability exists due to use of a weak hash in HttpTransferCache when generating TransferState cache keys for server-side rendered HTTP requests. A remote attacker can send a crafted link containing colliding query parameters to disclose sensitive information and poison application state.
Exploitation requires an SSR page that makes both a request containing the colliding parameter and a sensitive request.
Affected software
Angular
How to mitigate CVE-2026-54266
Install security update from vendor's website.
Angular - addressed in versions 20.3.25, 21.2.17, 22.0.1