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Vulnerability record · CVE-2022-23527 · published 14 December 2022

CVE-2022-23527: Mod auth openidc open redirect vulnerability

Openidc · Mod Auth Openidc

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.

6.1 CVSS 3.1 Medium EPSS 0.91% · top 41.7% CWE-601 · Open redirect
6.1CVSS 3.1 base score
0.91%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/zmartzone/mod_auth_openidc/blob/v2.4.12.1/auth_openidc.conf#L975-L984 Product
https://github.com/zmartzone/mod_auth_openidc/security/advisories/GHSA-q6f2-285m-gr53 Vendor Advisory
https://lists.debian.org/debian-lts-announce/2023/07/msg00020.html Mailing List
https://github.com/zmartzone/mod_auth_openidc/blob/v2.4.12.1/auth_openidc.conf#L975-L984 Product
https://github.com/zmartzone/mod_auth_openidc/security/advisories/GHSA-q6f2-285m-gr53 Vendor Advisory
https://lists.debian.org/debian-lts-announce/2023/07/msg00020.html Mailing List

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Source: NIST National Vulnerability Database (record CVE-2022-23527), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.