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CVE-2026-18963VulnerabilityPublished Updated

Red Hat Security Advisory: Red Hat build of Keycloak 26.4.15 Images Security Update

Affects Red HatSource GCVE Database

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Authoritative record:CVE-2026-18963· Critical 9.1

Public exploit available (Exploit-DB) · CVSS 9.1 Critical.

Data as of 12 Nov 2026, 19:47 UTC

CVSS 3.1 base score
9.1Critical
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (redhat)CVSS 3.19.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Exploitation evidence

t = 0 is the CVE’s publication on cve.org

  1. Disclosed: evidence found.

    CVE published 18 Aug 2026

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

    Not in CISA KEV and no source reports exploitation

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

    No attack traffic recorded by OffSeq Mirage sensors

Timeline

  1. CVE ID reserved

    by Red Hat, Inc.

    , 13 days before disclosure

  2. CVE published

    on cve.org

    , t = 0

  3. In Threat Radar

    record ingested

    , 16 minutes after disclosure

  4. First Exploit-DB entry (opens in a new tab)

    Keycloak 26.7.2 - Unauthenticated Account Takeover

    , 64 days after disclosure

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 12 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Red Hat build of Keycloak 26.4rhbk/keycloak-operator-bundleAffected–Fixed in–
Red Hat build of Keycloak 26.4rhbk/keycloak-rhel9Affected–Fixed in–
Red Hat build of Keycloak 26.4rhbk/keycloak-rhel9-operatorAffected–Fixed in–
Red Hat build of Keycloak 26.4.15keycloak-servicesAffected–Fixed in–
Red Hat build of Keycloak 26.4.15rhbk-openshift-rhel9/rhbk-openshift-rhel9Affected–Fixed in–
Red Hat build of Keycloak 26.6rhbk/keycloak-operator-bundleAffected–Fixed in–

AI-suggested

Red Hat has released updated container images for Keycloak 26.4.15 and its Operator that fix this vulnerability. Users should back up their existing installations, including applications, configurations, and databases, before applying the update. Applying the updated images is the recommended remediation. No alternative mitigations or workarounds are specified in the advisory.

Description

A critical security vulnerability (CVE-2026-18963) affects the Red Hat build of Keycloak 26.4.15 images used in OpenShift Container Platform. The flaw allows unauthenticated attackers to take over accounts by bypassing the reset-credentials flow. Red Hat has released updated container images to address this issue.

References

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