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Cups EUVDEUVD-2026-18863

| CVE-2026-27447 MEDIUM
Incorrect Authorization (CWE-863)
2026-04-03 GitHub_M
Authentication Bypass Cups
6.3
CVSS 3.1 · NVD
Temporal: 4.8
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Severity by source

NVD PRIMARY
6.3 MEDIUM
AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N
CIRCL (temporal)
4.8 MEDIUM
cvss
SUSE
4.8 MEDIUM
AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:L/A:N
Red Hat
6.4 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None

Lifecycle Timeline

5
CVSS changed
Jul 24, 2026 - 22:23 NVD
4.8 (MEDIUM) 6.3 (MEDIUM)
Patch released
Apr 10, 2026 - 08:30 nvd
Patch available
EUVD ID Assigned
Apr 03, 2026 - 21:30 euvd
EUVD-2026-18863
Analysis Generated
Apr 03, 2026 - 21:30 vuln.today
CVE Published
Apr 03, 2026 - 21:11 nvd
MEDIUM 4.8

DescriptionNVD

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.

AnalysisAI

CUPS daemon (cupsd) versions 2.4.16 and earlier authenticate users via case-insensitive username comparison, allowing an authenticated high-privileged user to bypass authorization controls by submitting requests under a username that differs only in case from an authorized user, gaining access to restricted printing operations. No public exploit code has been identified, and patches were not available at the time of initial disclosure, though a upstream commit indicates a fix may have been prepared.

Technical ContextAI

OpenPrinting CUPS is a printing system for Unix-like operating systems. The vulnerability stems from improper authorization logic (CWE-863: Improper Authorization) in the cupsd daemon's user authentication handler. When CUPS compares usernames during authorization checks for restricted operations, it performs case-insensitive string matching rather than the case-sensitive comparison required by POSIX username conventions. An attacker with valid high-privilege credentials can exploit this by crafting a request with an alternate-case username (e.g., 'Admin' instead of 'admin') that maps to the same system user, bypassing role-based access controls. The affected product is identified via CPE: cpe:2.3:a:openprinting:cups:*:*:*:*:*:*:*:* with a version range of 2.4.16 and prior.

RemediationAI

Upgrade to a patched version of CUPS released after the fix commit 88516bf6d9e34cef7a64a704b856b837f70cd220. At time of analysis, the description states no publicly available patches were released, so users should consult the official CUPS GitHub repository (https://github.com/OpenPrinting/cups) and the vendor's security advisory (https://github.com/OpenPrinting/cups/security/advisories/GHSA-v987-m8hp-phj9) for the specific patched version number and release timeline. Until a patch is available, restrict access to cupsd administrative interfaces and limit high-privilege account usage to necessary operations only, as the vulnerability requires both high privileges and user interaction to exploit.

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Same weakness CWE-863 – Incorrect Authorization

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CVE-2017-4915 HIGH POC
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CVE-2024-6782 CRITICAL POC
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CVE-2024-38856 CRITICAL POC
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Same technique Authentication Bypass

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CVE-2023-22515 CRITICAL POC
9.8
CVE-2012-4681 CRITICAL POC
9.8
CVE-2013-2465 CRITICAL POC
9.8
CVE-2011-3544 CRITICAL POC
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CVE-2025-61882 CRITICAL POC
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CVE-2024-0012 CRITICAL POC
9.3
CVE-2023-46805 HIGH POC
8.2
CVE-2012-1723 CRITICAL POC
9.8

Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Micro 5.2 Fixed
SUSE Linux Enterprise Micro 5.3 Fixed
SUSE Linux Enterprise Micro 5.4 Fixed

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EUVD-2026-18863 vulnerability details – vuln.today
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