CVE-2022-23527 Open Redirect in oidc_validate_redirect_url()

What is CVE-2022-23527?

CVE-2022-23527 is a medium-severity vulnerability in Debian Debian Linux, published on 14 Dec 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

mod_auth_openidc is an OpenID Certified™ authentication and authorization module for the Apache 2.x HTTP server. Versions prior to 2.4.12.2 are vulnerable to Open Redirect. When providing a logout parameter to the redirect URI, the existing code in oidc_validate_redirect_url() does not properly check for URLs that start with /\t, leading to an open redirect. This issue has been patched in version 2.4.12.2. Users unable to upgrade can mitigate the issue by configuring mod_auth_openidc to only allow redirection when the destination matches a given regular expression with OIDCRedirectURLsAllowed.

Weakness: CWE-601

Which versions are affected by CVE-2022-23527?

It affects 2 products.

Products include Debian Debian Linux, Openidc Mod Auth Openidc.

How do I fix CVE-2022-23527?

Upgrade to a fixed version.

Is CVE-2022-23527 being exploited?

There is no known exploitation of CVE-2022-23527 in the wild and no public exploit code.

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All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-11653, CLSA-2025-1753800294, DEBIAN-CVE-2022-23527, GHSA-q6f2-285m-gr53, UBUNTU-CVE-2022-23527, openSUSE-SU-2024:12584-1.