Modification of assumed-immutable data in Angular - CVE-2026-54267
Published: September 11, 2026
Vulnerability identifier: #VU149009
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-54267
CWE-ID: CWE-471
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to poison HTTP Transfer Cache responses.
The vulnerability exists due to improper control of assumed-immutable data in the Angular client hydration state-container lookup when processing attacker-controlled element IDs before the genuine state script is parsed. A remote attacker can inject a clobbered ng-state element containing forged JSON to poison HTTP Transfer Cache responses.
User interaction is required.
Affected software
Angular
How to mitigate CVE-2026-54267
Install security update from vendor's website.
Angular - addressed in versions 20.3.25, 21.2.17, 22.0.1