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
4.2EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.2Exploit: None knownExposed: 0

A fix is available — apply it.

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)
EG Risk
19(Track)
EG Risk 19/100SSVC: 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
Severity42% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
25%
KEV
Not listed

Published

May 27, 2026

Last Modified

August 20, 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(5)

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

Patch Availability(4)

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

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFixed inDependents
org.keycloak:keycloak-services1.0-alpha-1 ... 9.0.3 (216 versions)——

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 6× in last 7d / 75× 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 192 total refreshes for this CVE.

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

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 August 20, 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 0% probability of exploitation in the next 30 days, which ranks it in the top 75.3% of all scored CVEs.
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.

Dependency Blast Radius

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