Two case-insensitive comparisons on request-derived usernames outside the main authorization path in CUPS's scheduler (printer ACL validation and private-attribute filtering) could allow bypass of username-based access controls in certain configurations.

The version of cups installed on the remote host is prior to 2.4.19 / 2.4.20. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2026-278-01 advisory.

    New cups packages are available for Slackware 15.0 and -current to fix security issues.

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

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

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Two case-insensitive comparisons on request-derived usernames outside the main authorization path in
    CUPS's scheduler (printer ACL validation and private-attribute filtering) could allow bypass of username-
    based access controls in certain configurations. (CVE-2026-87876)

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Two case-insensitive comparisons on request-derived usernames outside the main authorization path in     CUPS's scheduler (printer ACL validation and private-attribute filtering) could allow bypass of username-     based access controls in certain configurations. (CVE-2026-87876)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
363018	Slackware Linux 15.0 / current cups Multiple Vulnerabilities (SSA:2026-278-01)	Nessus	Slackware Local Security Checks	Local	medium
455432	Echo: cups: security update to 2.4.18-1+e2	Tenable Cloud Security	Echo Local Security Checks	Local	low
455432	Echo: cups: security update to 2.4.18-1+e2	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	low
344342	Linux Distros Unpatched Vulnerability : CVE-2026-87876	Nessus	Misc.	Local	low

Detections

Analytics

CVE-2026-87876

low

Tenable Plugins

medium

low

low

low