Vulnerability Report

CVE-2026-27447

Title: Authorization Bypass in OpenPrinting CUPS

Auth Bypass

Proof Of Concept

No public PoC currently indexed for CVE-2026-27447.

CWE Category CWE-863
Published Date Apr 03, 2026
Modified Date Apr 22, 2026
Exploit Status Not Found
Score 4.8 CVSS v3.1
Exploit Probability (EPSS)
0.01%

Vulnerability Summary

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.

Impacted Vendors

E
easy_software_products 1
O
openprinting 1

Reference Links

https://github.com/OpenPrinting/cups/commit/88516bf6d9e34cef7a64a704b856b837f70cd220 https://github.com/OpenPrinting/cups/security/advisories/GHSA-v987-m8hp-phj9
CVSS v3.1
Source Entity [email protected]
Severity MEDIUM
4.8
Attack Vector
NETWORK
Complexity
HIGH
Privileges
N/A
Interaction
REQUIRED
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:L/A:N
CVSS v3.1
Source Entity [email protected]
Severity MEDIUM
6.3
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
REQUIRED
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-27447 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity HIGH
Privileges N/A
Interaction REQUIRED
CVSS Vector String CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:L/A:N

Affected Stack

No specific products linked.