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CVE-2025-2559VulnerabilityPublished Updated

Red Hat Security Advisory: Red Hat build of Keycloak 26.0.11 Update

Affects Red HatSource GCVE Database

0

Mentioned vulnerabilities

Not known to be exploited · fixed in Red Hat package updates : patch Red Hat soon.

Data as of 26 Oct 2026, 15:59 UTC

Severity
High

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS
0.7% chance of exploitation in 30 days – higher than 53% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 26.0.11

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 29 Apr 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: 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 26 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
Red Hat Product Security Red HatAffected
  • Red Hat
  • Red Hat build of Keycloak
  • Red Hat Build of Keycloak
Fixed in–

AI-suggested

Red Hat has provided an official update to version 26.0.11 of their build of Keycloak that addresses these vulnerabilities. Users should back up their existing installations, including applications, configuration files, and databases, before applying the update. Applying this update mitigates the identified security issues.

Description

Red Hat has released an important security update for its build of Keycloak, version 26.0.11. This update addresses three security issues: a JWT token cache exhaustion vulnerability that can lead to denial of service, a hostname verification flaw, and a bypass in two-factor authentication. These vulnerabilities affect the authentication and single sign-on capabilities provided by Keycloak. Users are advised to back up their installations before applying the update.

References

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