CVE-2026-11800
High · 8.1CVSS
8.1
EPSS
0.3%
Published
Jun 25, 2026
CISA due date
—
The record
A flaw was found in Keycloak. This JWT algorithm confusion vulnerability in the JWT Authorization Grant flow allows an attacker with valid client credentials to bypass signature verification. By forging an assertion, the attacker can create unauthorized access tokens. This enables the attacker to impersonate any federated user linked to the affected Identity Provider, leading to unauthorized access and potential privilege escalation.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|
Related vulnerabilities
- CVE-2026-87947 Improper Verification of Cryptographic Signature vulnerability in Drupal SAML SSO… CWE-347
- CVE-2026-84918 Improper Verification of Cryptographic Signature vulnerability in Drupal Monobank payment… CWE-347
- CVE-2026-102271 PyJWT is a Python implementation of JSON Web Token standards. CWE-347
- CVE-2026-102272 PyJWT is a Python implementation of JSON Web Token standards. CWE-347
- CVE-2026-102273 PyJWT is a Python implementation of JSON Web Token standards. CWE-347
- CVE-2026-102268 PyJWT is a Python implementation of JSON Web Token standards. CWE-347
- CVE-2026-102266 PyJWT is a Python implementation of JSON Web Token standards. CWE-347
- CVE-2026-73784 A potential security vulnerability in HPE IceWall products could be exploited to tamper… CWE-347