Debian 9812 Published by

A libapache2-mod-auth-openidc security update has been released for Debian GNU/Linux 10 LTS.

[SECURITY] [DLA 3499-1] libapache2-mod-auth-openidc security update

Debian LTS Advisory DLA-3499-1 Guilhem Moulin
July 19, 2023

Package : libapache2-mod-auth-openidc
Version :
CVE ID : CVE-2021-39191 CVE-2022-23527
Debian Bug : 993648 1026444

Open Redirect vulnerabilities were found in libapache2-mod-auth-openidc,
OpenID Connect Relying Party implementation for Apache, which could lead
to information disclosure via phishing attacks.


The 3rd-party init SSO functionality of mod_auth_openidc was
reported to be vulnerable to an open redirect attack by supplying a
crafted URL in the target_link_uri parameter.


When providing a logout parameter to the redirect URI,
mod_auth_openidc failed to properly check for URLs starting with
"/\t", leading to an open redirect.

For Debian 10 buster, these problems have been fixed in version

We recommend that you upgrade your libapache2-mod-auth-openidc packages.

For the detailed security status of libapache2-mod-auth-openidc please refer to
its security tracker page at:

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: