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Fencer Vulns
low 3.1

CVE-2021-32792 json

XSS vulnerability when using OIDCPreservePost On in mod_auth_openidc

published 2021-07-26 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-19555

cvss
3.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.5%
EPSS 1.5% chance of exploitation in 30 days, percentile 74%
public exploits
0
none known

Summary

mod_auth_openidc is an authentication/authorization module for the Apache 2.x HTTP server that functions as an OpenID Connect Relying Party, authenticating users against an OpenID Connect Provider. In mod_auth_openidc before version 2.4.9, there is an XSS vulnerability in when using `OIDCPreservePost On`.

Patch / fix

  • openidc mod_auth_openidc 2.4.9
  • libapache2-mod-auth-openidc Debian 14, Debian 13, Debian 12 2.4.9-1

debian advisories DEBIAN-CVE-2021-32792

  • cjose RHEL 8 0.6.1-2.module+el8+2454+f890a43a
  • mod_auth_openidc RHEL 8 2.3.7-11.module+el8.6.0+14082+b6f23e95

red hat advisories RHSA-2022:1823

  • apache2-mod_auth_openidc SLE Module for Server Applications 15 SP7, SLE Module for Server Applications 15 SP6, openSUSE Leap 15.6 2.4.17.1-150600.16.14.1
  • apache2-mod_auth_openidc SLES for SAP 12 SP5, SLES 12 SP5 2.4.0-3.23.1
  • apache2-mod_auth_openidc SLE Module for Server Applications 15 SP3, SLE Module for Server Applications 15 SP2 2.3.8-3.15.1

suse advisories SUSE-SU-2025:4532-1SUSE-SU-2021:3352-1SUSE-SU-2021:3020-1

  • apache2-mod_auth_openidc openSUSE Leap 15.2 2.3.8-lp152.5.6.1
  • apache2-mod_auth_openidc openSUSE Leap 15.3 2.3.8-3.15.1

opensuse advisories openSUSE-SU-2021:1277-1openSUSE-SU-2021:3020-1

  • cjose AlmaLinux 8 0.6.1-2.module_el8.6.0+2868+44838709
  • mod_auth_openidc AlmaLinux 8 2.3.7-11.module_el8.6.0+2868+44838709

almalinux advisories ALSA-2022:1823

  • cjose Rocky Linux 8 0.6.1-2.module+el8.3.0+129+2feafa46
  • mod_auth_openidc Rocky Linux 8 2.3.7-11.module+el8.6.0+840+73eca44e

rocky linux advisories RLSA-2022:1823

  • httpd CBL-Mariner 2.0 2.4.52-1

azure linux advisories AZL-6482

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-32792 updated cvss 6.1

mod_auth_openidc: XSS when using OIDCPreservePost On

  • Red Hat Enterprise Linux AppStream (v. 8) cjose 0.6.1-2.module+el8+2454+f890a43a, mod_auth_openidc 2.3.7-11.module+el8.6.0+14082+b6f23e95
    fixed: vendor fix RHSA-2022:1823
  • Red Hat Enterprise Linux 7 mod_auth_openidc Red Hat Enterprise Linux 9 mod_auth_openidc
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.51% chance of exploitation in the next 30 days, higher than 74% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

  • zmartzone mod_auth_openidc

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.