Input validation error in mod_auth_openidc - #VU142424
Published: August 13, 2026
Vulnerability identifier: #VU142424
CSH Severity: Low
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to alter authorization request parameters.
The vulnerability exists due to improper input validation in authorization request parameter handling when appending extra parameters that duplicate module-set values. A remote attacker can supply duplicate protocol parameters to alter authorization request parameters.
The impact depends on how the identity provider handles duplicated parameters.
Affected software
mod_auth_openidc
Remediation
Install security update from vendor's website.
mod_auth_openidc - update to 2.4.20.1