SB2026090159 - Weak Password Recovery Mechanism for Forgotten Password in Red Hat build of Keycloak 26.4
Published: September 1, 2026
Security Bulletin ID
SB2026090159
CSH Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Weak Password Recovery Mechanism for Forgotten Password (CVE-ID: CVE-2026-18963)
CWE-ID: CWE-640 - Weak password recovery mechanism
CVSSv4: 9.3 [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]
The vulnerability allows a remote attacker to take over arbitrary user accounts.
The vulnerability exists due to a weak password recovery mechanism in the reset-credentials flow of the keycloak-services component when handling password reset requests. A remote attacker can bypass the required email verification link and set new credentials to take over arbitrary user accounts.
Remediation
Install update from vendor's website.