Critical9.1Red Hat Linux Updated

Critical [CVE-2026-18963] Unauthenticated account takeover via reset-credentials flow bypass

This critical-severity Red Hat Linux advisory covers CVE-2026-18963 affecting Red Hat build of Keycloak 26.4, Red Hat build of Keycloak 26.6.6, Red Hat JBoss Enterprise Application Platform Expansion Pack.

CVE-2026-18963 Published Aug 18, 2026Updated by vendor Aug 17, 2026

CVE-2026-18963

Affected products & platforms

Red Hat LinuxUnclassified

Open vendor advisory

Android app · Google Play

Monitor future Red Hat Linux CVEs from your phone.

Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 32 official vendor sources and 160+ reviewed platform categories.

Matching phone alertsOptional email delivery

Get CVE alerts See app features

Summary

Unauthenticated account takeover via reset-credentials flow bypass. Red Hat rates this critical (CVSS 9.1).

Weakness: CWE-640. Red Hat lists fixing advisory RHSA-2026:56524 with package keycloak-rhel9-container-26.4-23, keycloak-rhel9-operator-bundle-container-26.6.6-1, rhbk-keycloak-rhel9/rhbk-keycloak-rhel9, keycloak-rhel9-container-26.6-12.

Affected products named by the advisory: Red Hat build of Keycloak 26.4; Red Hat build of Keycloak 26.6.6; Red Hat JBoss Enterprise Application Platform Expansion Pack.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.

Official advisory · high-confidence parse· fetched 1 hour ago·verify at source

Fixed versions

keycloak-rhel9-container-26.4-23
keycloak-rhel9-operator-bundle-container-26.6.6-1
rhbk-keycloak-rhel9/rhbk-keycloak-rhel9
keycloak-rhel9-container-26.6-12
keycloak-services
rhbk-openshift-rhel9/rhbk-openshift-rhel9
keycloak-rhel9-operator-container-26.6-12
rhbk/keycloak-rhel9-operator:26.4-23
rhbk/keycloak-operator-bundle:26.4.15-1
RHSA-2026:56524

Official advisory · high-confidence parse· fetched 1 hour ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Official advisory · high-confidence parse· fetched 1 hour ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Red Hat Security Data APIofficial
Official vendor source used to discover this advisory; it remains the authority for affected products and remediation. Discovered from the machine-readable feed https://access.redhat.com/hydra/rest/securitydata/cve.json; this link opens the Red Hat Linux advisory index instead of the raw feed document.
Red Hat Linux
Official vendor advisoryofficial
Official advisory article fetched and its advisory identity was verified before publication. identity-sha256=1a68764d8c035d26eeb736b1ba42e5642ed4adaea3b0927bc347e2b4a38afc35
Red Hat Linux
CVE.org CNA affected-product recordCVE.org
Structured CNA affected[] data independently confirmed the affected product scope; native advisory content remains authoritative.
CVE Program

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-18963NVD CVE.org MITRE

Discussion(0)

No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.