CVE-2026-18208

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-07-31. the CNA's CVSS baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:redhat, epss, ghsa
Trending — 3 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A flaw was found in the OIDC token introspection endpoint of the keycloak-services component. Keycloak is an open-source identity and access management solution used to secure modern applications and services. The issue occurs when a confidential client, configured to receive signed JWT introspection responses, attempts to introspect a token issued for a different audience. Although the endpoint correctly identifies the token as inactive for that client, it still returns the full set of token claims within a signed JWT field. This allows an unauthorized client to bypass audience-based restrictions and access sensitive information contained in the token.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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 computed
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
10%
KEV
Not listed

Published

July 31, 2026

Last Modified

August 31, 2026

Advisory Details (2)

Auto-updated Jul 31, 2026
Patch available. Sources: redhat.
redhat

2508304 – (CVE-2026-18208) CVE-2026-18208 keycloak-services: keycloak-services: Inactive out-of-audience token introspection leaks signed JWT claim

https://bugzilla.redhat.com/show_bug.cgi?id=2508304
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-18208

Vendor Advisories for CVE-2026-18208(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 16× in last 7d / 71× 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.

Showing the most recent 100 of 122 total refreshes for this CVE.

  1. 2026-09-15 03:04 UTCGHSA enrichment
  2. 2026-09-13 19:47 UTCEG score recompute
  3. 2026-09-13 19:47 UTCGHSA enrichment
  4. 2026-09-13 16:46 UTCEPSS rescore
  5. 2026-09-12 17:23 UTCEG score recompute
  6. 2026-09-12 17:23 UTCGHSA enrichment
  7. 2026-09-12 15:00 UTCEPSS rescore
  8. 2026-09-11 14:58 UTCEG score recompute
  9. 2026-09-11 14:58 UTCGHSA enrichment
  10. 2026-09-11 14:52 UTCEPSS rescore
  11. 2026-09-11 09:36 UTCEPSS rescore
  12. 2026-09-10 10:02 UTCEG score recompute
  13. 2026-09-10 10:02 UTCGHSA enrichment
  14. 2026-09-10 09:34 UTCEPSS rescore
  15. 2026-09-09 07:07 UTCEG score recompute
  16. 2026-09-09 07:06 UTCGHSA enrichment
  17. 2026-09-08 22:00 UTCEPSS rescore
  18. 2026-09-07 23:43 UTCEG score recompute
  19. 2026-09-07 23:42 UTCGHSA enrichment
  20. 2026-09-07 16:01 UTCEPSS rescore
  21. 2026-09-06 21:18 UTCEG score recompute
  22. 2026-09-06 21:18 UTCGHSA enrichment
  23. 2026-09-06 13:47 UTCEPSS rescore
  24. 2026-09-05 18:47 UTCEG score recompute
  25. 2026-09-05 18:47 UTCGHSA enrichment
Show 75 more
  1. 2026-09-04 11:38 UTCEG score recompute
  2. 2026-09-04 11:38 UTCGHSA enrichment
  3. 2026-09-04 05:06 UTCEPSS rescore
  4. 2026-09-03 09:13 UTCEG score recompute
  5. 2026-09-03 09:13 UTCGHSA enrichment
  6. 2026-09-02 14:11 UTCEPSS rescore
  7. 2026-09-01 22:34 UTCEG score recompute
  8. 2026-09-01 22:34 UTCGHSA enrichment
  9. 2026-09-01 13:53 UTCEPSS rescore
  10. 2026-09-01 04:39 UTCEPSS rescore
  11. 2026-08-31 15:39 UTCEG score recompute
  12. 2026-08-31 15:39 UTCGHSA enrichment
  13. 2026-08-31 00:47 UTCEG score recompute
  14. 2026-08-31 00:47 UTCGHSA enrichment
  15. 2026-08-30 19:17 UTCEPSS rescore
  16. 2026-08-30 01:22 UTCEPSS rescore
  17. 2026-08-29 22:23 UTCEG score recompute
  18. 2026-08-29 22:23 UTCGHSA enrichment
  19. 2026-08-28 21:41 UTCEPSS rescore
  20. 2026-08-27 14:25 UTCEPSS rescore
  21. 2026-08-27 12:51 UTCEG score recompute
  22. 2026-08-27 12:51 UTCGHSA enrichment
  23. 2026-08-26 14:46 UTCEPSS rescore
  24. 2026-08-26 10:27 UTCEG score recompute
  25. 2026-08-26 10:27 UTCGHSA enrichment
  26. 2026-08-25 13:48 UTCEPSS rescore
  27. 2026-08-25 07:25 UTCEG score recompute
  28. 2026-08-25 07:25 UTCGHSA enrichment
  29. 2026-08-24 05:01 UTCGHSA enrichment
  30. 2026-08-23 02:38 UTCEG score recompute
  31. 2026-08-23 02:37 UTCGHSA enrichment
  32. 2026-08-23 00:19 UTCEPSS rescore
  33. 2026-08-22 00:13 UTCEG score recompute
  34. 2026-08-22 00:13 UTCGHSA enrichment
  35. 2026-08-21 23:49 UTCEPSS rescore
  36. 2026-08-20 22:55 UTCEPSS rescore
  37. 2026-08-20 21:49 UTCGHSA enrichment
  38. 2026-08-19 19:26 UTCEG score recompute
  39. 2026-08-19 19:26 UTCGHSA enrichment
  40. 2026-08-19 17:03 UTCEPSS rescore
  41. 2026-08-18 15:51 UTCEG score recompute
  42. 2026-08-18 15:51 UTCGHSA enrichment
  43. 2026-08-18 13:48 UTCEPSS rescore
  44. 2026-08-17 13:47 UTCEPSS rescore
  45. 2026-08-17 12:23 UTCEG score recompute
  46. 2026-08-17 12:23 UTCGHSA enrichment
  47. 2026-08-16 14:56 UTCEPSS rescore
  48. 2026-08-16 09:59 UTCEG score recompute
  49. 2026-08-16 09:59 UTCGHSA enrichment
  50. 2026-08-16 02:14 UTCEPSS rescore
  51. 2026-08-15 07:36 UTCEG score recompute
  52. 2026-08-15 07:36 UTCGHSA enrichment
  53. 2026-08-15 01:30 UTCEPSS rescore
  54. 2026-08-14 05:12 UTCEG score recompute
  55. 2026-08-14 05:12 UTCGHSA enrichment
  56. 2026-08-13 22:00 UTCEPSS rescore
  57. 2026-08-13 02:49 UTCEG score recompute
  58. 2026-08-13 02:49 UTCGHSA enrichment
  59. 2026-08-12 13:50 UTCEPSS rescore
  60. 2026-08-12 00:25 UTCEG score recompute
  61. 2026-08-12 00:25 UTCGHSA enrichment
  62. 2026-08-11 13:42 UTCEPSS rescore
  63. 2026-08-11 00:00 UTCEPSS rescore
  64. 2026-08-10 22:02 UTCGHSA enrichment
  65. 2026-08-09 19:38 UTCEG score recompute
  66. 2026-08-09 19:38 UTCGHSA enrichment
  67. 2026-08-09 13:46 UTCEPSS rescore
  68. 2026-08-08 17:15 UTCEG score recompute
  69. 2026-08-08 17:15 UTCGHSA enrichment
  70. 2026-08-08 16:37 UTCEPSS rescore
  71. 2026-08-07 14:51 UTCGHSA enrichment
  72. 2026-08-07 00:07 UTCEG score recompute
  73. 2026-08-07 00:07 UTCGHSA enrichment
  74. 2026-08-06 13:46 UTCEPSS rescore
  75. 2026-08-05 21:44 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-18208?
CVE-2026-18208 is a medium vulnerability published on July 31, 2026. A flaw was found in the OIDC token introspection endpoint of the keycloak-services component. Keycloak is an open-source identity and access management solution used to secure modern applications and services. The issue occurs when a confidential client, configured to receive signed JWT…
When was CVE-2026-18208 disclosed?
CVE-2026-18208 was first published in the National Vulnerability Database on July 31, 2026, with the most recent update on August 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18208 actively exploited?
CVE-2026-18208 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 89.9% of all scored CVEs.
What is the CVSS score of CVE-2026-18208?
CVE-2026-18208 has a CVSS v4.0 base score of 6.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-18208?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18208, 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-2026-18208

Explore →

Is Your Infrastructure Affected by CVE-2026-18208?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs