CVE-2026-18963 Keycloak-services: keycloak-services: unauthenticated account takeover via reset-credentials flow bypass

What is CVE-2026-18963?

CVE-2026-18963 is a critical authentication bypass vulnerability in Red Hat JBoss Enterprise Application Platform Expansion Pack, published on 18 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A flaw was found in the reset-credentials flow of the keycloak-services component, which is the core engine for identity and access management in Red Hat Build of Keycloak. The issue allows an unauthenticated attacker to force the password reset process for any user without needing to click the required email verification link. This can result in the attacker gaining full control over target user accounts by directly setting new credentials.

Weakness: CWE-640

Which versions are affected by CVE-2026-18963?

7 open source packages ship an affected version, including org.keycloak:keycloak-services and keycloak.

How do I fix CVE-2026-18963?

Upgrade org.keycloak:keycloak-services to a fixed version for your release line: 26.4.15, 26.6.6 or 26.7.2.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-18963 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-18963 exists.

Public exploit code: 1 Exploit-DB entry, 1 Nuclei template and 18 proofs of concept on GitHub.

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-keycloak-2026-18963, GHSA-4gv3-mc9p-5wqc, MINI-8p5h-fpq7-v4fq, MINI-frxh-pvqr-j73f.