OS Command Injection in mod_auth_openidc - #VU159582
Published: November 6, 2026
Vulnerability identifier: #VU159582
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-78
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an unauthenticated remote attacker to execute arbitrary commands on the Apache host as the worker user.
The vulnerability exists due to mod_auth_openidc interpreting an exec: prefix in provider-supplied secrets as a command when processing metadata. An unauthenticated remote attacker can trigger registration with a malicious identity provider when multi-provider OIDCMetadataDir and Dynamic Client Registration are enabled without OIDCDiscoverIssuersAllowed, causing a supplied client_secret to execute.
Affected software
mod_auth_openidc
Remediation
Install security update from vendor's website.
mod_auth_openidc - update to 2.4.20.4