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    CVE-2026-27447

    OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, CUPS daemon (cupsd) contains an authorization bypass vulnerability due to case-insensitive username comparison during authorization checks. The vulnerability allows an unprivileged user to gain unauthorized access to restricted operations by using a user with a username that differs only in case from an authorized user. At time of publication, there are no publicly available patches.

    Published:Apr 3, 2026
    Last Modified:Apr 22, 2026
    EPS:Apr 3, 2026
    EPSS Score:0.00012
    CVSS Score:4.8

    Affected Products

    Vendor
    Openprinting
    Product
    Cups

    Exploits

    https://github.com/OpenPrinting/cups/security/advisories/GHSA-v987-m8hp-phj9

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-39316 (CVSS 4) — OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versio…
    CVE-2026-39314 (CVSS 4) — OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versio…
    CVE-2026-34980 (CVSS 6.1) — OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versio…
    CVE-2026-34979 (CVSS 5.3) — OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versio…
    CVE-2026-34978 (CVSS 6.5) — OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versio…
    CVE-2026-34990 (CVSS 5) — OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versio…
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    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