CVE-2026-74909: Auth Bypass (CVSS 8.1)

Description

Keycloak provides a policy enforcer to protect applications by matching incoming web requests against defined security policies. A flaw was found where the enforcer fails to correctly normalize web addresses that contain special encoded characters, such as those representing semicolons or directory traversal segments. An authenticated user can use these encoded characters to trick the enforcer into applying a less restrictive security policy than intended, potentially gaining unauthorized access to sensitive administrative or private application endpoints.

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CVSS v3.1 Score

8.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Weakness Type (CWE)

CWE-862 Missing Authorization

References

Other References

https://access.redhat.com/errata/RHSA-2026:68276 https://access.redhat.com/errata/RHSA-2026:68277 https://access.redhat.com/errata/RHSA-2026:68278 https://access.redhat.com/errata/RHSA-2026:68280 https://access.redhat.com/security/cve/CVE-2026-74909 https://bugzilla.redhat.com/show_bug.cgi?id=2517354

Frequently Asked Questions

What is CVE-2026-74909? +

Keycloak provides a policy enforcer to protect applications by matching incoming web requests against defined security policies. A flaw was found where the enforcer fails to correctly normalize web addresses that contain special encoded characters, such as those representing semicolons or directory traversal segments. An authenticated user can use these encoded characters to trick the enforcer into applying a less restrictive security policy than intended, potentially gaining unauthorized access to sensitive administrative or private application endpoints. It has a CVSS v3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-74909? +

CVE-2026-74909 has a CVSS v3.1 score of 8.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

How do I check if I'm vulnerable to CVE-2026-74909? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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