CVE-2026-16093

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

Score 5.4 from GitHub Security Advisory published 2026-07-17. the CNA's CVSS baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:redhat, epss, ghsa
Trending — 3 sources updated this week
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: None knownExposed: 0

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

Keycloak provides a mechanism called Client Policies to enforce security requirements on clients, such as requiring them to use signed JWTs for authentication. A flaw was discovered where this enforcement can be bypassed. An attacker with valid client credentials can provide a fake, unsigned assertion header that tricks the system into thinking the policy requirements have been met. This allows the attacker to authenticate using simpler methods like a client secret even when the administrator has mandated more secure, signed assertions.

CVSS v3
5.4
EG Score
5.4(medium)
EG Risk
24(Track)
EG Risk 24/100SSVC: 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
Severity54% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
23%
KEV
Not listed

Published

July 17, 2026

Last Modified

August 31, 2026

Advisory Details (2)

Auto-updated Jul 17, 2026
Patch available. Sources: redhat.
redhat

2501729 – (CVE-2026-16093) CVE-2026-16093 keycloak-services: keycloak-services: Required signed-JWT assertion policy can be bypassed with unsigned assertion headers

https://bugzilla.redhat.com/show_bug.cgi?id=2501729
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-16093

Vendor Advisories for CVE-2026-16093(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 9× in last 7d / 59× 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 123 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-16093?
CVE-2026-16093 is a medium vulnerability published on July 17, 2026. Keycloak provides a mechanism called Client Policies to enforce security requirements on clients, such as requiring them to use signed JWTs for authentication. A flaw was discovered where this enforcement can be bypassed. An attacker with valid client credentials can provide a fake, unsigned…
When was CVE-2026-16093 disclosed?
CVE-2026-16093 was first published in the National Vulnerability Database on July 17, 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-2026-16093 actively exploited?
CVE-2026-16093 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 77.1% of all scored CVEs.
What is the CVSS score of CVE-2026-16093?
CVE-2026-16093 has a CVSS v4.0 base score of 5.4 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-16093?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-16093, 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

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