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CVE-2026-87876: cups Improper Handling of Case Sensitivity

CVSS: 3.0v3.1LowAwaiting analysis
AliasesRHSA-2026:67568UBUNTU-CVE-2026-87876DEBIAN-CVE-2026-87876
Published 09-09-2026Last modified 16-10-2026
Open JSON

Vulnerability summary

CVE-2026-87876 is a low (CVSS 3.0) Improper Handling of Case Sensitivity vulnerability in cups. EPSS estimates a 0.33% chance of exploitation in the next 30 days, higher than 24.4% of scored vulnerabilities.

Overall risk
12/100
0100
Low · default modelHow is this calculated?
CVSS score
3.0/10
010
Low · v3.1 (CVE.org)
EPSS score
0.33%
0%100%
Low · -0.06 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1
MGASA-2026-0483

Timeline

  1. 09-09-2026
    PublishedVulnerability first disclosed.
  2. 16-10-2026
    Last modifiedVulnerability information updated.

Description

Two case-insensitive comparisons on request-derived usernames outside the main authorization path in CUPS's scheduler (printer ACL validation and private-attribute filtering) could allow bypass of username-based access controls in certain configurations.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.33%

Chance of exploitation in the next 30 days

Percentile

24%

Versus all other CVEs

30-day change

-0.06 pp

From 0.39% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.33%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Redhat8 products
  • cups< 0:2.4.19-4.2.hum1
  • cups-client< 0:2.4.19-4.2.hum1
  • cups-devel< 0:2.4.19-4.2.hum1
  • cups-filesystem< 0:2.4.19-4.2.hum1
  • cups-ipptool< 0:2.4.19-4.2.hum1
Debian1 product
  • cupsAll versions (No fix recorded)
Ubuntu1 product
  • cupsAll versions (No fix recorded)

3 vendors · 10 products

References

13 links
Show all 13 references