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CVE-2026-8763VulnerabilityPublished

Red Hat Security Advisory: Red Hat build of Keycloak 26.6.8 Security Update

Affects Red HatSource GCVE Database

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Authoritative record:CVE-2026-8763· Critical 9.3

Not known to be exploited · CVSS 9.3 Critical · fixed in Red Hat package updates : patch Red Hat bcprov as a priority.

Data as of 6 Nov 2026, 11:51 UTC

CVSS 4.0 base score
9.3Critical
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 1.85, 2.73.12, 2.1.3 +2
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/U:Amber

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 3 Aug 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 6 Nov 2026.

What to do

Upgrade BC-JAVA and Legion of the Bouncy Castle Inc./bcprov to 1.85; BC-LTS-JAVA and Legion of the Bouncy Castle Inc./bcprov-lts8on to 2.73.12; BC-FJA and Legion of the Bouncy Castle Inc./bc-fips to 2.1.3, 2.0.2 or 1.0.2.7.

Affected software

ProductAffectedFixed in
Legion of the Bouncy Castle Inc.BC-JAVAAffected
  • <1.85
Fixed in
  • 1.85
Legion of the Bouncy Castle Inc.BC-LTS-JAVAAffected
  • >=2.73.0 <2.73.12
Fixed in
  • 2.73.12
Legion of the Bouncy Castle Inc.BC-FJAAffected
  • >=2.1.0 <2.1.3
Fixed in
  • 2.1.3
Legion of the Bouncy Castle Inc.BC-FJAAffected
  • >=2.0.0 <2.0.2
Fixed in
  • 2.0.2
Legion of the Bouncy Castle Inc.BC-FJAAffected
  • >=1.0.0 <1.0.2.7
Fixed in
  • 1.0.2.7
MavenLegion of the Bouncy Castle Inc./bcprovpkg:maven/Legion of the Bouncy Castle Inc./bcprovOther threatsAffected
  • <1.85
Fixed in
  • 1.85

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 packages for Keycloak 26.6.8 that address these vulnerabilities. Users should apply the Red Hat build of Keycloak 26.6.8 security update promptly to mitigate these risks. Since this is not a cloud service, remediation requires updating the affected Keycloak server installations. No additional vendor advisory mitigation instructions indicate alternative or temporary fixes.

Description

Red Hat has released a security update for its build of Keycloak 26.6.8, addressing multiple vulnerabilities affecting authentication, authorization, denial of service, information disclosure, privilege escalation, and injection flaws. The update fixes a wide range of issues including account takeover, path traversal, denial of service, cross-site scripting, SQL injection, and cryptographic signature bypass among others. These vulnerabilities impact the Keycloak standalone server used for authentication and single sign-on for web and mobile applications.

References

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