Debian dsa-6504 : libapache2-mod-auth-openidc - security update

high Nessus Plugin ID 346982

Synopsis

The remote Debian host is missing a security-related update.

Description

The remote Debian 13 host has a package installed that is affected by a vulnerability as referenced in the dsa-6504 advisory.

- ------------------------------------------------------------------------- Debian Security Advisory DSA-6504-1 [email protected] https://www.debian.org/security/ Moritz Muehlenhoff September 17, 2026 https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : libapache2-mod-auth-openidc CVE ID : CVE-2026-54789

It was discovered that incorrect state cookie parsing in mod_auth_openidc, an OpenID Certified authentication and authorisation module for the Apache HTTP server that implements the OpenID Connect Relying Party functionality, could result in denial of service.

For the stable distribution (trixie), this problem has been fixed in version 2.4.17-1+deb13u1.

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:
https://security-tracker.debian.org/tracker/libapache2-mod-auth-openidc

Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/

Mailing list: [email protected]

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade the libapache2-mod-auth-openidc packages.

Plugin Details

Severity: High

ID: 346982

File Name: debian_DSA-6504.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 9/17/2026

Updated: 9/17/2026

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.61

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2026-54789

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:13.0, p-cpe:/a:debian:debian_linux:libapache2-mod-auth-openidc

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 9/17/2026

Vulnerability Publication Date: 8/21/2026

Reference Information

CVE: CVE-2026-54789

Detections

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