CVE-2026-16093

MEDIUMPre-NVD 5.45.4
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

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, GitHub Security Advisory, a secondary CVSS source

Also known asEUVD-2026-45222 (ENISA EUVD) · GHSA-jmhg-9c54-p575 (GitHub Security Advisories)Source: ENISA EUVD

5.4EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 5.4Exploit: None knownExposed services: Not assessed

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
5.4MEDIUMmedium confidence
EG Risk
24
EG Risk 24/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity54% × 45%
Impact severity (EG Severity): CVSS 5.4 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
33rd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (5.4): severity, escalated by confirmed exploitation. This CVE's 5.4 is its impact severity (EG Severity), not escalated.

EG Severity
5.4 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 17, 2026

Last Modified

September 16, 2026

Advisory Details (2)

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

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
Red HatMentions a patch (unverified)

cve-details

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

Patch Availability(2)

Vendor / EcosystemFix (by version range) / 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.

Data Freshness Timeline

(refreshed 8× in last 7d / 41× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 198 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 98 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  2. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  3. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  4. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  5. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  6. 2026-10-25 14:47 UTCEG score recompute
  7. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  8. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  9. 2026-10-23 06:22 UTCEG score recompute
  10. 2026-10-23 06:22 UTCVendor advisory
  11. 2026-10-23 06:22 UTCGHSA enrichmentGHSA-jmhg-9c54-p575 · GitHub CVSS 5.4
  12. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  13. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  14. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  15. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  16. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  17. 2026-10-18 04:01 UTCEG score recompute
  18. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  19. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  20. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  21. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  22. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  23. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  24. 2026-10-12 16:30 UTCEG score recompute
  25. 2026-10-11 20:09 UTCEG score recompute
Show 75 more
  1. 2026-10-11 17:21 UTCEG score recompute
  2. 2026-10-11 14:54 UTCEG score recompute
  3. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  4. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  5. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  6. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  7. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  8. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  9. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  10. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  11. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  12. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  13. 2026-10-01 10:28 UTCEG score recompute
  14. 2026-10-01 10:28 UTCVendor advisory
  15. 2026-10-01 10:28 UTCGHSA enrichmentGHSA-jmhg-9c54-p575 · GitHub CVSS 5.4
  16. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  17. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  18. 2026-09-28 07:53 UTCEG score recompute
  19. 2026-09-28 07:53 UTCVendor advisory
  20. 2026-09-28 07:53 UTCGHSA enrichmentGHSA-jmhg-9c54-p575 · GitHub CVSS 5.4
  21. 2026-09-27 13:47 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  22. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  23. 2026-09-24 04:35 UTCEG score recompute
  24. 2026-09-24 04:35 UTCVendor advisory
  25. 2026-09-24 04:35 UTCGHSA enrichmentGHSA-jmhg-9c54-p575 · GitHub CVSS 5.4
  26. 2026-09-23 02:26 UTCEG score recompute
  27. 2026-09-23 02:26 UTCVendor advisory
  28. 2026-09-23 02:26 UTCGHSA enrichmentGHSA-jmhg-9c54-p575 · GitHub CVSS 5.4
  29. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  30. 2026-09-18 04:32 UTCEG score recompute
  31. 2026-09-18 04:32 UTCVendor advisory
  32. 2026-09-18 04:32 UTCGHSA enrichmentGHSA-jmhg-9c54-p575 · GitHub CVSS 5.4
  33. 2026-09-16 19:21 UTCEG score recompute
  34. 2026-09-16 19:21 UTCGHSA enrichmentGHSA-jmhg-9c54-p575 · GitHub CVSS 5.4
  35. 2026-09-16 18:41 UTCEG score recompute
  36. 2026-09-16 18:41 UTCGHSA enrichmentGHSA-jmhg-9c54-p575 · GitHub CVSS 5.4
  37. 2026-09-16 17:11 UTCEG score recompute
  38. 2026-09-16 17:11 UTCGHSA enrichmentGHSA-jmhg-9c54-p575 · GitHub CVSS 5.4
  39. 2026-09-16 15:55 UTCEG score recompute
  40. 2026-09-16 15:55 UTCGHSA enrichmentGHSA-jmhg-9c54-p575 · GitHub CVSS 5.4
  41. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  42. 2026-09-16 05:14 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  43. 2026-09-14 05:24 UTCEG score recompute
  44. 2026-09-14 05:24 UTCGHSA enrichmentGHSA-jmhg-9c54-p575 · GitHub CVSS 5.4
  45. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  46. 2026-09-13 05:15 UTCEG score recompute
  47. 2026-09-13 05:15 UTCGHSA enrichmentGHSA-jmhg-9c54-p575 · GitHub CVSS 5.4
  48. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  49. 2026-09-11 21:06 UTCEG score recompute
  50. 2026-09-11 21:06 UTCGHSA enrichmentGHSA-jmhg-9c54-p575 · GitHub CVSS 5.4
  51. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  52. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  53. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  54. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  55. 2026-09-08 00:00 UTCEG score recompute
  56. 2026-09-08 00:00 UTCGHSA enrichmentGHSA-jmhg-9c54-p575 · GitHub CVSS 5.4
  57. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  58. 2026-09-05 20:26 UTCEG score recompute
  59. 2026-09-05 20:26 UTCGHSA enrichmentGHSA-jmhg-9c54-p575 · GitHub CVSS 5.4
  60. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  61. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  62. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  63. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  64. 2026-08-31 15:39 UTCEG score recompute
  65. 2026-08-31 15:39 UTCGHSA enrichmentGHSA-jmhg-9c54-p575 · GitHub CVSS 5.4
  66. 2026-08-31 03:33 UTCEG score recompute
  67. 2026-08-31 03:33 UTCGHSA enrichmentGHSA-jmhg-9c54-p575 · GitHub CVSS 5.4
  68. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  69. 2026-08-30 03:17 UTCEG score recompute
  70. 2026-08-30 03:17 UTCGHSA enrichmentGHSA-jmhg-9c54-p575 · GitHub CVSS 5.4
  71. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  72. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  73. 2026-08-28 01:48 UTCEG score recompute
  74. 2026-08-28 01:48 UTCGHSA enrichmentGHSA-jmhg-9c54-p575 · GitHub CVSS 5.4
  75. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 22nd percentile

Frequently asked(5)

What is CVE-2026-16093?
CVE-2026-16093 is a medium-severity vulnerability; its CVE record was 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 made public?
CVE-2026-16093 was made public on July 16, 2026: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on July 17, 2026. EchelonGraph's copy of the record carries a last-modified date of September 16, 2026; the record at its source may have been updated since.
Is CVE-2026-16093 actively exploited?
CVE-2026-16093 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (33rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-16093?
CVE-2026-16093 has a CVSS base score of 5.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-16093?
A fix for CVE-2026-16093 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-16093 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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