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. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
CVE-2026-18218
MEDIUMPre-NVD 4.24.2—Trending — 3 sources updated this week
EchelonGraph scoreHIGH confidence
Score 4.2 from GitHub Security Advisory published 2026-07-31. the CNA's CVSS baseline 4.2; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: cna:redhat, ghsa
4.2EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 4.2Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 4.2
- EG Score
- 4.2(high)
- EG Risk
- 19(Track)EG Risk 19/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity42% × 45%Exploitation0% × 40%Automatability0% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- —
- EPSS %ILE
- —
- KEV
- Not listed
Published
July 31, 2026
Last Modified
July 31, 2026
Advisory Details (2)
Auto-updated Jul 31, 2026Patch available. Sources: redhat.
redhat
2508313 – (CVE-2026-18218) CVE-2026-18218 keycloak-services: keycloak-services: Client not-before revocation ignored when realm not-before is older but nonzero
https://bugzilla.redhat.com/show_bug.cgi?id=2508313Vendor Advisories for CVE-2026-18218(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 5× in last 7d / 5× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-31 16:23 UTCEG score recompute
- 2026-07-31 16:23 UTCGHSA enrichment
- 2026-07-31 08:18 UTCEG score recompute
- 2026-07-31 07:28 UTCEG score recompute
- 2026-07-31 07:28 UTCMITRE cvelistV5first tracked
Frequently asked(4)
What is CVE-2026-18218?
CVE-2026-18218 is a medium vulnerability published on July 31, 2026. 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,…
When was CVE-2026-18218 disclosed?
CVE-2026-18218 was first published in the National Vulnerability Database on July 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-18218?
CVE-2026-18218 has a CVSS v3 base score of 4.2 (NVD).
How do I remediate CVE-2026-18218?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18218, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-18218
Is Your Infrastructure Affected by CVE-2026-18218?
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