Improper access control in mod_auth_openidc - #VU142425
Published: August 13, 2026
Vulnerability identifier: #VU142425
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to revoke another user's tokens at the identity provider.
The vulnerability exists due to improper access control in front-channel logout handling when processing a logout request identified only by a sid and carrying no authenticated session. A remote attacker can send a crafted logout request naming a known sid to revoke another user's tokens at the identity provider.
Exploitation requires knowledge of a valid sid.
Affected software
mod_auth_openidc
Remediation
Install security update from vendor's website.
mod_auth_openidc - update to 2.4.20.1