Cross-site scripting in mod_auth_openidc - #VU142422
Published: August 13, 2026
Vulnerability identifier: #VU142422
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: N/A
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary script in the victim\'s browser.
The vulnerability exists due to cross-site scripting in module-generated pages when rendering unescaped values into HTML attributes. A remote attacker can supply crafted redirect URI or provider metadata values to execute arbitrary script in the victim\'s browser.
This affects the discovery page and the auto-POST form, and exploitation requires a relative OIDCRedirectURI or attacker-influenced provider metadata.
Affected software
mod_auth_openidc
Remediation
Install security update from vendor's website.
mod_auth_openidc - update to 2.4.20.1