CVE-2026-9689

MEDIUMPre-NVD 4.24.2—
EchelonGraph scoreMEDIUM confidence

Score 4.2 from GitHub Security Advisory published 2026-05-27. a secondary CVSS source baseline 4.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
4.2
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.2Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A flaw was found in Keycloak, an open-source identity and access management solution. When a client application is configured to accept broad redirect Uniform Resource Identifiers (URIs), a remote attacker can manipulate the authentication process by crafting a special web address. If a user clicks this link, the client application might incorrectly prioritize attacker-controlled information over legitimate data. This vulnerability, known as HTTP parameter pollution, could allow an attacker to bypass security measures or gain unauthorized access to resources.

CVSS v3
4.2
EG Score
4.2(medium)
EPSS
11.6%
KEV
Not listed

Published

May 27, 2026

Last Modified

June 3, 2026

Advisory Details (2)

Auto-updated Jun 18, 2026
Patch available. Sources: redhat.
redhat

2481845 – (CVE-2026-9689) CVE-2026-9689 keycloak: org.keycloak.protocol.oidc: HTTP Parameter Pollution in OIDC redirect URI allows response parameter duplication - #GHI-604

https://bugzilla.redhat.com/show_bug.cgi?id=2481845
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-9689

Vendor Advisories for CVE-2026-9689(1)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
mavenorg.keycloak:keycloak-services—ghsa

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 9× in last 7d / 49× 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 103 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-9689?
CVE-2026-9689 is a medium vulnerability published on May 27, 2026. A flaw was found in Keycloak, an open-source identity and access management solution. When a client application is configured to accept broad redirect Uniform Resource Identifiers (URIs), a remote attacker can manipulate the authentication process by crafting a special web address. If a user clicks…
When was CVE-2026-9689 disclosed?
CVE-2026-9689 was first published in the National Vulnerability Database on May 27, 2026, with the most recent update on June 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-9689 actively exploited?
CVE-2026-9689 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 11.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-9689?
CVE-2026-9689 has a CVSS v3 base score of 4.2 (NVD).
How do I remediate CVE-2026-9689?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9689, 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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