Skip to main content
CVE-2026-4874VulnerabilityPublished Updated

Red Hat Security Advisory: Red Hat build of Keycloak 26.4.13 Images Security Update

Affects Red Hat keycloakSource GCVE Database

0
Compare

Mentioned vulnerabilities

Authoritative record:CVE-2026-4874· Low 3.1

Not known to be exploited · CVSS 3.1 Low : upgrade Red Hat keycloak to 26.6.0 when convenient.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score
3.1Low
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 28% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 26.6.0
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 26 Mar 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade keycloak/keycloak to 26.6.0.

Affected software

ProductAffectedFixed in
GitHubkeycloak/keycloakpkg:github/keycloak/keycloakOther threatsAffected
  • <26.6.0
  • <=26.6.3
Fixed in
  • 26.6.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Red Hat has released updated images and packages for the Red Hat build of Keycloak 26.4.13 and 26.6.3 that address these vulnerabilities. Users should apply these updates promptly. Before updating, it is recommended to back up existing installations, including applications, configuration files, and databases. No vendor advisory indicates that no action is required or that these issues are already mitigated. Therefore, applying the official patches is the recommended remediation.

Description

Red Hat build of Keycloak is an integrated sign-on solution, available as a Red Hat JBoss Middleware for OpenShift containerized image. The Red Hat build of Keycloak for OpenShift image provides an authentication server that you can use to log in centrally, log out, and register. You can also manage user accounts for web applications, mobile applications, and RESTful web services. Red Hat build of Keycloak Operator for OpenShift simplifies deployment and management of Keycloak 26.4.13 clusters. This erratum releases new images for Red Hat build of Keycloak 26.4.13 for use within the OpenShift Container Platform cloud computing Platform-as-a-Service (PaaS) for on-premise or private cloud deployments, aligning with the standalone product release. Security fixes: * Information disclosure via CORS header injection due to unvalidated JWT azp claim (CVE-2026-37977) * Server-Side Request Forgery via OIDC token endpoint manipulation (CVE-2026-4874) * eclipse-vertx/vert.x:Denial of Service via TLS handshake with wildcard server name (CVE-2026-6860) * Improper Access Control on Keycloak Server when the account Account API feature is disabled (CVE-2026-7500) * Policy bypass during WebAuthn credential registration via client-side JavaScript manipulation (CVE-2026-8830) * Security flaw in org.keycloak/keycloak-services (CVE-2026-8922) * Information disclosure through arbitrary filesystem path probing (CVE-2026-9083) * Cross-site scripting (XSS) via case-insensitive URI validation bypass (CVE-2026-9086) * Cross-Session Email Verification Proof Not Bound to Upstream Identity in First-Broker-Login (CVE-2026-9087) * Information disclosure due to user profile permission bypass (CVE-2026-9088) * Group-Admin Escalation to Realm-Admin (CVE-2026-9099) * Privilege escalation due to oversized subject_token JWT (CVE-2026-9704) * Attacker can re-enable and take over disabled clients via Registration Access Token (CVE-2026-9705) * Organization Data Leak After Feature Disabled in Keycloak (CVE-2026-9791) * Security restriction bypass allows unauthorized ROPC token acquisition (CVE-2026-9792) * Information disclosure via SAML ECP endpoint (CVE-2026-9794) * Privilege escalation via improper scope mapping enforcement (CVE-2026-9795) * Unauthorized access to resources via UMA permission ticket bypass (CVE-2026-9799) * Authorization bypass via incorrect URI comparison (CVE-2026-9800) * Denial of Service via malformed LDAP password policy response (CVE-2026-9801) * Unauthorized account access via replayed refresh tokens after cluster restart (CVE-2026-9802) * Denial of Service via malformed Authorization header (CVE-2026-9803)

References

Community reviews

Loading reviews…