OpenPrinting CUPS: Authorization bypass via case-insensitive group-member lookup_CVE-2026-27447

4.8 / 10

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:L/A:N

Description

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.

Basic Information

ID CVE-2026-27447

Source GitHub_M

Published Apr 3, 2026 at 21:11

Modified Apr 6, 2026 at 18:50

Affected Product

Vendor OpenPrinting

Product cups

Version <= 2.4.16

Affected Versions OpenPrinting cups <= 2.4.16

CWE Classification

CWE-863

References

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    "published": "2026-04-03T21:11:59.734Z",
    "modified": "2026-04-06T18:50:21.909Z",
    "type": "cve",
    "title": "OpenPrinting CUPS: Authorization bypass via case-insensitive group-member lookup",
    "source": "GitHub_M",
    "references": "https://github.com/OpenPrinting/cups/security/advisories/GHSA-v987-m8hp-phj9\nhttps://github.com/OpenPrinting/cups/commit/88516bf6d9e34cef7a64a704b856b837f70cd220",
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