Medium 4.8Published Apr 3, 2026

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

Updated under an hour ago (Oct 26, 2026, 3:50 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for OpenPrinting cups

Exploited in the last 30 days

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.

CVSS: 4.8 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:L/A:N
Weakness (CWE): CWE-863
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Apr 6, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

OpenPrinting cups openprinting:cups (from the name)	through 2.4.16	CNA record
openprinting cups openprinting:cups	through 2.4.16	NVD

References

References

https://github.com/OpenPrinting/cups/security/advisories/GHSA-v987-m8hp-phj9	x-refsource-confirm, exploit, vendor-advisory
https://github.com/OpenPrinting/cups/commit/88516bf6d9e34cef7a64a704b856b837f70cd220	x-refsource-misc, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.