CVE-2026-16442

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 90% 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
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

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
9.8(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
10%
KEV
Not listed

Published

August 5, 2026

Last Modified

August 10, 2026

Advisory Details (6)

Auto-updated Aug 17, 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 / EcosystemFixed in / PatchReleasedSource
redhatrhbk/keycloak-rhel9-operator:26.6-112026-08-05redhat
redhatrhbk-openshift-rhel9/rhbk-openshift-rhel92026-08-05redhat
redhatrhbk/keycloak-rhel9-operator:26.4-222026-08-05redhat

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 92× in last 7d / 176× 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 176 total refreshes for this CVE.

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

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 in the National Vulnerability Database on August 5, 2026, with the most recent update on August 10, 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% probability of exploitation in the next 30 days, which ranks it in the top 89.5% of all 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?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-16442, 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

Explore the affected products and dependency analysis for CVE-2026-16442

Explore →

Is Your Infrastructure Affected by CVE-2026-16442?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs