CVE-2026-16442

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.3% (22nd percentile of EPSS-scored CVEs). GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw was found in the SAML broker component of Keycloak, which is used to manage identity federation and user authentication. The issue occurs because the IdP-initiated Single Sign-On endpoint fails to check if a provider is restricted to account linking only. This allows an attacker with control over a linked upstream identity to bypass login restrictions and gain full access to a local user account.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
44
EG Risk 44/100CISA SSVC

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
Severity98% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
22nd
KEV
Not listed

CISA SSVCTrack 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). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 5, 2026

Last Modified

August 31, 2026

Advisory Details (6)

Auto-updated Sep 28, 2026
Patch available. Sources: redhat.
redhat

2503138 – (CVE-2026-16442) CVE-2026-16442 keycloak-services: keycloak-services: SAML IdP-initiated broker login bypasses link-only restriction

https://bugzilla.redhat.com/show_bug.cgi?id=2503138
redhat Patch Available

CVE-2026-16442 - 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-2026-16442
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-2026-16442(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 / EcosystemFix (by version range) / 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 36× in last 7d / 228× 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 553 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-16442?
CVE-2026-16442 is a critical vulnerability published on August 5, 2026. A flaw was found in the SAML broker component of Keycloak, which is used to manage identity federation and user authentication. The issue occurs because the IdP-initiated Single Sign-On endpoint fails to check if a provider is restricted to account linking only. This allows an attacker with control…
When was CVE-2026-16442 disclosed?
CVE-2026-16442 was first published 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-2026-16442 actively exploited?
CVE-2026-16442 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (22nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-16442?
CVE-2026-16442 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-16442?
A fix for CVE-2026-16442 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-16442 are linked in the Vendor Advisories panel on this page.

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