CVE-2026-16443

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 92% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in the SAML metadata import functionality of the keycloak-services component, which is the core engine for identity brokering in Red Hat Build of Keycloak. When importing identity provider metadata that lacks specific usage attributes for keys, the system incorrectly disables signature validation for SAML responses even if a signing certificate is provided. This issue allows an unauthenticated attacker to forge a SAML response and gain unauthorized access to a user account by knowing their external identifier.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
41(Track)
EG Risk 41/100SSVC: 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
Severity91% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
8%
KEV
Not listed

Published

August 5, 2026

Last Modified

August 31, 2026

Advisory Details (6)

Auto-updated Sep 15, 2026
Patch available. Sources: redhat.
redhat

2503139 – (CVE-2026-16443) CVE-2026-16443 keycloak-services: keycloak-services: SAML broker metadata import disables response signature validation

https://bugzilla.redhat.com/show_bug.cgi?id=2503139
redhat Patch Available

CVE-2026-16443 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-16443
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:50849
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:50848
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:50847
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:50846

Vendor Advisories for CVE-2026-16443(5)

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

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrhbk/keycloak-rhel9-operator:26.6-112026-08-05redhat
redhatrhbk/keycloak-rhel9-operator:26.4-222026-08-05redhat
redhatrhbk-openshift-rhel9/rhbk-openshift-rhel92026-08-05redhat

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 78× in last 7d / 334× 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 522 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-16443?
CVE-2026-16443 is a critical vulnerability published on August 5, 2026. A flaw was found in the SAML metadata import functionality of the keycloak-services component, which is the core engine for identity brokering in Red Hat Build of Keycloak. When importing identity provider metadata that lacks specific usage attributes for keys, the system incorrectly disables…
When was CVE-2026-16443 disclosed?
CVE-2026-16443 was first published in the National Vulnerability Database on August 5, 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-2026-16443 actively exploited?
CVE-2026-16443 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 92.2% of all scored CVEs.
What is the CVSS score of CVE-2026-16443?
CVE-2026-16443 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-16443?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-16443, 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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