CVE-2026-18218 — MEDIUM (4.2)

Vulnerability Description

A flaw was found in the TokenManager component of the Keycloak identity management service. When an administrator attempts to revoke tokens for a specific application (client) using a "not-before" policy, the revocation may be silently ignored if the overall security realm already has an older, non-zero revocation policy in place. This issue can allow previously issued tokens to remain valid for refreshing sessions and accessing user information even after an administrator has attempted to invalidate them. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

CVSS Score

4.2

MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

LOW

Integrity

LOW

Availability

NONE

Affected Products

Vendor	Product	Versions
Redhat	Build Of Keycloak	-

Related Weaknesses (CWE)

CWE-862

References

https://access.redhat.com/security/cve/CVE-2026-18218Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2508313Issue TrackingVendor Advisory

FAQ

What is CVE-2026-18218?

CVE-2026-18218 is a vulnerability with a CVSS score of 4.2 (MEDIUM). A flaw was found in the TokenManager component of the Keycloak identity management service. When an administrator attempts to revoke tokens for a specific application (client) using a "not-before" pol...

How severe is CVE-2026-18218?

CVE-2026-18218 has been rated MEDIUM with a CVSS base score of 4.2/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-18218?

Check the references section above for vendor advisories and patch information. Affected products include: Redhat Build Of Keycloak.