How severe is CVE-2026-27447?

CVE-2026-27447 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2026-27447 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-27447?

CVE-2026-27447 affects Openprinting Cups. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-27447?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-27447 have an EU (EUVD) identifier?

Yes. CVE-2026-27447 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18863.

When was CVE-2026-27447 published?

CVE-2026-27447 was published on 2026-04-03 and last updated on 2026-06-17.

CVE-2026-27447

CVE-2026-27447 is a medium-severity vulnerability in Openprinting Cups with a CVSS 3.x base score of 4.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-863.

Key facts

Severity: Medium (CVSS 3.x base score 4.8)
EPSS exploit prediction: 0% (24th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-18863
Weakness: CWE-863
Affected product: Openprinting Cups
Published: 2026-04-03
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-27447?: CVE-2026-27447 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2026-27447 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-27447?: CVE-2026-27447 affects Openprinting Cups. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-27447?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-27447 have an EU (EUVD) identifier?: Yes. CVE-2026-27447 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18863.
When was CVE-2026-27447 published?: CVE-2026-27447 was published on 2026-04-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:openprinting:cups:*:*:*:*:*:*:*:*

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Other CWE-863 (Incorrect Authorization) vulnerabilities

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CVE-2026-46595 — Critical (CVSS 10.0): Previously, CVE-2024-45337 fixed an authorization bypass for misused ssh server configurations; if any other type of…
CVE-2026-33105 — Critical (CVSS 10.0): Improper authorization in Microsoft Azure Kubernetes Service allows an unauthorized attacker to elevate privileges over…
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