WaratekVRT Sign in

CVE-2026-4282 Build of Keycloak

Affected softwareBuild of Keycloak
Severity7.4 High CVSS 3.1 2 scores
Fixed in26.5.7
WeaknessCWE-653
Published2 Apr 2026
Updated26 Oct 2026

Description

A flaw was found in Keycloak. The SingleUseObjectProvider, a global key-value store, lacks proper type and namespace isolation. This vulnerability allows an unauthenticated attacker to forge authorization codes. Successful exploitation can lead to the creation of admin-capable access tokens, resulting in privilege escalation.

Exploitation status

No public exploit

No exploit has been reported in the sources we check. The 1 repository below are public GitHub repositories with fewer than 5 stars.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC 1 indexed, none at 5+ stars
  • EPSS 0.43% chance in 30 days

1 of these are GitHub repositories with fewer than 5 stars. They are listed for reference and don't count toward the exploitation status above.

IndexArtifactStarsFirst seen
GitHub PoC Non-intrusive version-based vulnerability scanner for CVE-2026-4282 (Keycloak SingleUseObjectProvider isolation flaw enabling authorization code forgery & privilege escalation) 3 2026-08-09

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists: keycloak/keycloak 9046f20.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.
Candidate fix https://bugzilla.redhat.com/show_bug.cgi?id=2448061 : a Red Hat bug: the triage, which links onward to the fix

CVSS

7.4 HIGH v3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.1 7.4 HIGH CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N secalert@redhat.com Secondary published
CVSS 3.1 7.4 HIGH CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N redhat-SADP Secondary

Affected software and releases

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.keycloak:keycloak-services 0 26.5.7 unbounded

Products and versions

2 products, 6 version entries
SourceVendorProductSchemeAffected versions
osv org.keycloak keycloak-services generic < 26.5.7
nvd redhat build of keycloak generic any version · 26.2 · 26.2.15 · 26.4 · 26.4.11

References

URLTags
https://bugzilla.redhat.com/show_bug.cgi?id=2448061 bugzilla
https://github.com/keycloak/keycloak/issues/47719 WEB
https://github.com/keycloak/keycloak/commit/9046f201125a6fd6be9c116b99d348509d99d4a5 WEB
https://access.redhat.com/errata/RHSA-2026:6475 WEB
https://access.redhat.com/errata/RHSA-2026:6476 WEB
https://access.redhat.com/errata/RHSA-2026:6477 WEB
https://access.redhat.com/errata/RHSA-2026:6478 WEB
https://access.redhat.com/security/cve/CVE-2026-4282 WEB
https://github.com/keycloak/keycloak PACKAGE
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4282.json

Timeline

Published2026-04-02By the CVE Program.
NVD record modified2026-10-26NVD's own last-modified date for this record.