CVE-2026-87876

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    CVE-2026-87876

    Published: 9 Sept 2026Last Modified: 11 Sept 2026

    Summary: Cups: openprinting cups: remaining case-insensitive username matching in scheduler side paths (cve-2026-27447 follow-up)

    Details: 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.

    References: https://access.redhat.com/downloads/content/package-browser/, https://access.redhat.com/security/cve/CVE-2026-87876, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87876.json, https://github.com/OpenPrinting/cups/security/advisories/GHSA-r8jp-q6fh-g5r2, https://nvd.nist.gov/vuln/detail/CVE-2026-87876, https://bugzilla.redhat.com/show_bug.cgi?id=2530991, https://github.com/OpenPrinting/cups/commit/88e67c00c130a45f3a1edf36686f7a0b2982fef8, https://github.com/OpenPrinting/cups/commit/f56844dbe4a54a9f8e1aeb3b913fbee614156bdb

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -88e67c00c130a45f3a1edf36686f7a0b2982fef8

    Affected versions

    v2.4.19
    v2.4.18
    v2.4.17
    v2.4.16
    v2.4.15
    v2.4.14
    v2.4.13
    v2.4.12
    v2.4.11
    v2.4.10
    v2.4.9
    v2.4.8
    v2.4.7
    v2.4.6
    v2.4.5
    v2.4.3
    v2.4.4
    v2.4.2
    v2.4.1
    v2.4.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-87876 | CVE-DB