CVE-2026-9704

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 76% 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 — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in Keycloak. An authenticated user with low privileges can exploit this vulnerability by sending an oversized subject_token JSON Web Token (JWT) to the TokenEndpoint. When the token exceeds a 4000-character limit, it is silently dropped, causing the system to fall back to client credentials. This allows the user to gain the permissions of the client's service account, leading to privilege escalation.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
24%
KEV
Not listed

Published

May 27, 2026

Last Modified

June 26, 2026

Advisory Details (2)

Auto-updated Jun 9, 2026
Patch available. Sources: redhat.
redhat

2481877 – (CVE-2026-9704) CVE-2026-9704 keycloak: Keycloak: Privilege escalation due to oversized subject_token JWT

https://bugzilla.redhat.com/show_bug.cgi?id=2481877
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-9704

Vendor Advisories for CVE-2026-9704(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:26.4-192026-06-25redhat
redhatrhbk/keycloak-rhel92026-06-25redhat
redhatrhbk/keycloak-operator-bundle:26.6.4-22026-06-25redhat
redhatrhbk/keycloak-rhel9-operator:26.6-62026-06-10redhat

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

(2 across 1 ecosystem)
Maven(2)
PackageVulnerable rangeFixed inDependents
org.keycloak:keycloak-server-spi-private10.0.0 ... 9.0.3 (167 versions)26.6.3—
org.keycloak:keycloak-services1.0-alpha-1 ... 9.0.3 (227 versions)26.6.3—

Weakness Classification(1)

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

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 11× in last 7d / 41× 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 102 total refreshes for this CVE.

  1. 2026-07-27 11:43 UTCEG score recompute
  2. 2026-07-27 11:43 UTCVendor advisory
  3. 2026-07-26 14:54 UTCEPSS rescore
  4. 2026-07-25 14:18 UTCEPSS rescore
  5. 2026-07-24 14:18 UTCEPSS rescore
  6. 2026-07-23 14:18 UTCEPSS rescore
  7. 2026-07-23 03:23 UTCEG score recompute▲ 2.00
  8. 2026-07-22 14:08 UTCEPSS rescore
  9. 2026-07-21 15:25 UTCEPSS rescore
  10. 2026-07-21 15:25 UTCEPSS rescore
  11. 2026-07-20 17:08 UTCEPSS rescore
  12. 2026-07-19 14:31 UTCEPSS rescore
  13. 2026-07-19 02:29 UTCEPSS rescore
  14. 2026-07-18 10:04 UTCEPSS rescore
  15. 2026-07-16 17:03 UTCEPSS rescore
  16. 2026-07-15 16:57 UTCEPSS rescore
  17. 2026-07-15 02:00 UTCEPSS rescore
  18. 2026-07-13 22:31 UTCEPSS rescore
  19. 2026-07-13 06:13 UTCEPSS rescore
  20. 2026-07-12 05:46 UTCEPSS rescore
  21. 2026-07-11 23:51 UTCVendor advisory
  22. 2026-07-11 08:27 UTCEPSS rescore
  23. 2026-07-09 19:10 UTCEPSS rescore
  24. 2026-07-09 00:00 UTCVendor advisory
  25. 2026-07-08 15:16 UTCEPSS rescore
Show 75 more
  1. 2026-07-07 13:46 UTCEPSS rescore
  2. 2026-07-06 16:27 UTCEPSS rescore
  3. 2026-07-06 02:23 UTCEPSS rescore
  4. 2026-07-05 02:31 UTCEPSS rescore
  5. 2026-07-04 06:31 UTCEPSS rescore
  6. 2026-07-01 15:07 UTCEPSS rescore
  7. 2026-07-01 10:49 UTCVendor advisory
  8. 2026-07-01 10:49 UTCGHSA enrichment
  9. 2026-06-30 23:22 UTCEPSS rescore
  10. 2026-06-29 14:23 UTCVendor advisory
  11. 2026-06-29 14:23 UTCGHSA enrichment
  12. 2026-06-29 14:06 UTCEPSS rescore
  13. 2026-06-28 14:07 UTCEPSS rescore
  14. 2026-06-28 08:07 UTCVendor advisory
  15. 2026-06-28 08:07 UTCGHSA enrichment
  16. 2026-06-28 04:56 UTCEPSS rescore
  17. 2026-06-27 06:02 UTCVendor advisory
  18. 2026-06-27 06:02 UTCGHSA enrichment
  19. 2026-06-27 03:08 UTCEPSS rescore
  20. 2026-06-26 03:23 UTCVendor advisory
  21. 2026-06-26 03:23 UTCGHSA enrichment
  22. 2026-06-25 13:50 UTCEPSS rescore
  23. 2026-06-25 01:23 UTCVendor advisory
  24. 2026-06-25 01:23 UTCGHSA enrichment
  25. 2026-06-24 14:05 UTCEPSS rescore
  26. 2026-06-23 21:33 UTCEPSS rescore
  27. 2026-06-22 14:25 UTCEPSS rescore
  28. 2026-06-21 14:56 UTCEPSS rescore
  29. 2026-06-21 01:59 UTCEPSS rescore
  30. 2026-06-19 19:26 UTCEPSS rescore
  31. 2026-06-18 17:52 UTCEPSS rescore
  32. 2026-06-17 17:53 UTCEPSS rescore
  33. 2026-06-17 11:38 UTCVendor advisory
  34. 2026-06-17 11:38 UTCGHSA enrichment
  35. 2026-06-16 17:53 UTCEPSS rescore
  36. 2026-06-16 09:40 UTCVendor advisory
  37. 2026-06-16 09:39 UTCGHSA enrichment
  38. 2026-06-15 17:49 UTCEPSS rescore
  39. 2026-06-15 06:58 UTCVendor advisory
  40. 2026-06-15 06:58 UTCGHSA enrichment
  41. 2026-06-14 23:18 UTCEPSS rescore
  42. 2026-06-14 04:58 UTCVendor advisory
  43. 2026-06-14 04:58 UTCGHSA enrichment
  44. 2026-06-13 23:00 UTCEPSS rescore
  45. 2026-06-13 02:58 UTCVendor advisory
  46. 2026-06-13 02:58 UTCGHSA enrichment
  47. 2026-06-12 23:12 UTCEPSS rescore
  48. 2026-06-12 23:12 UTCEPSS rescore
  49. 2026-06-12 00:59 UTCVendor advisory
  50. 2026-06-12 00:59 UTCGHSA enrichment
  51. 2026-06-11 14:00 UTCEPSS rescore
  52. 2026-06-10 23:00 UTCGHSA enrichment
  53. 2026-06-10 22:19 UTCEPSS rescore
  54. 2026-06-10 13:22 UTCEPSS rescore
  55. 2026-06-09 21:01 UTCGHSA enrichment
  56. 2026-06-08 23:31 UTCNVD updateCVSS v3 → 8.8 · severity → HIGH
  57. 2026-06-08 18:54 UTCGHSA enrichment
  58. 2026-06-08 14:17 UTCEPSS rescore
  59. 2026-06-07 15:25 UTCEPSS rescore
  60. 2026-06-07 13:30 UTCGHSA enrichment
  61. 2026-06-06 13:47 UTCEPSS rescore
  62. 2026-06-06 11:30 UTCGHSA enrichment
  63. 2026-06-05 22:47 UTCEPSS rescore
  64. 2026-06-05 09:32 UTCGHSA enrichment
  65. 2026-06-05 06:10 UTCEPSS rescore
  66. 2026-06-04 13:12 UTCEPSS rescore
  67. 2026-06-04 07:33 UTCGHSA enrichment
  68. 2026-06-03 05:34 UTCGHSA enrichment
  69. 2026-06-02 20:13 UTCEPSS rescore
  70. 2026-06-02 03:35 UTCGHSA enrichment
  71. 2026-06-01 13:52 UTCEPSS rescore
  72. 2026-06-01 01:36 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-2026-9704?
CVE-2026-9704 is a high vulnerability published on May 27, 2026. A flaw was found in Keycloak. An authenticated user with low privileges can exploit this vulnerability by sending an oversized subject_token JSON Web Token (JWT) to the TokenEndpoint. When the token exceeds a 4000-character limit, it is silently dropped, causing the system to fall back to client…
When was CVE-2026-9704 disclosed?
CVE-2026-9704 was first published in the National Vulnerability Database on May 27, 2026, with the most recent update on June 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-9704 actively exploited?
CVE-2026-9704 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 75.6% of all scored CVEs.
What is the CVSS score of CVE-2026-9704?
CVE-2026-9704 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-9704?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9704, 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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