CVE-2026-16093

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

Score 5.4 from GitHub Security Advisory published 2026-07-17. a secondary CVSS source baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — Patch released 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

A fix is available — apply it.

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
33%
KEV
Not listed

Published

July 17, 2026

Last Modified

September 16, 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(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrhbk/keycloak-rhel9-operator:26.6-202026-09-16redhat
redhatrhbk-openshift-rhel9/rhbk-openshift-rhel92026-09-16redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 20× in last 7d / 63× 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 145 total refreshes for this CVE.

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

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 September 16, 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 66.7% of all scored CVEs.
What is the CVSS score of CVE-2026-16093?
CVE-2026-16093 has a CVSS v3 base score of 5.4 (NVD).
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.

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