CVE-2026-74909 Keycloak - Broken Access Control

Keycloak contains a broken access control caused by improper normalization of encoded special characters in web addresses, letting authenticated users bypass security policies and gain unauthorized access to sensitive endpoints, exploit requires user authentication.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.85% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Broken Access Control
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Published
16 September 2026
Updated
15 October 2026
Weakness
CWE-862

Vendor fix

Update to the latest version with the fix for policy enforcer normalization.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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