Is CVE-2026-27447 in the CISA KEV catalog?

No. CVE-2026-27447 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-27447?

CVE-2026-27447 has a CVSS v3 base score of 4.8 (Moderate).

What is the EPSS score for CVE-2026-27447?

CVE-2026-27447 has an EPSS score of 0.32% (24th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-27447?

Upgrade cups on debian unstable to 2.4.17-1 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2026-27447

MEDIUM

4.8

CVSS v3

NVD

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.

CWE-863Incorrect Authorization

How to fix

Remediation Available

cupsDebian

Fixed in:2.4.17-1CVE-2026-27447

cupsRed Hat / RHEL

Fixed in:main@srcRHSA-2026:8814

Fixed in:main@x86_64RHSA-2026:8814

Fixed in:main@noarchRHSA-2026:8814

Fixed in:main@aarch64RHSA-2026:8814

cupsRocky

Fixed in:main@aarch64RHSA-2026:8814

Fixed in:main@srcRHSA-2026:8814

Fixed in:main@x86_64RHSA-2026:8814

Fixed in:main@noarchRHSA-2026:8814

cupsUbuntu

Fixed in:2.4.1op1-1ubuntu4.20USN-8405-1

Fixed in:2.4.7-1.2ubuntu7.13USN-8405-1

Fixed in:2.4.12-0ubuntu3.9USN-8405-1

cups-daemonUbuntu

Fixed in:2.4.1op1-1ubuntu4.20USN-8405-1

Fixed in:2.4.7-1.2ubuntu7.13USN-8405-1

Fixed in:2.4.12-0ubuntu3.9USN-8405-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredHigh

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

0.32%probability of exploitation in 30 days

24thpercentile

Low risk: more likely to be exploited than 24% of all known CVEs.

References

Patch1

github.com

Exploit1

github.com

Related Vulnerabilities

Other CWE-863 (Incorrect Authorization) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-22518	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-38035	Critical	9.8	100%	KEV + Ransom	-
CVE-2022-46169	Critical	9.8	100%	KEV	Fix
CVE-2025-29927	Critical	9.1	100%	-	Fix
CVE-2024-38856	Critical	9.8	99%	KEV	Fix
CVE-2020-36289	Medium	5.3	99%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-22.