Vulnerability in Red Hat Enterprise Linux 10
CVE-2026-87876
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.0 (Low). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (24.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 24.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-87876 (vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking)
- github.com/OpenPrinting/cups/security/advisories/GHSA-r8jp-q6fh-g5r2
- github.com/OpenPrinting/cups/commit/88e67c00c130a45f3a1edf36686f7a0b2982fef8
- github.com/OpenPrinting/cups/commit/f56844dbe4a54a9f8e1aeb3b913fbee614156bdb
- access.redhat.com/errata/RHSA-2026:67568 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-87876?
- CVE-2026-87876 is a low-severity vulnerability in Red Hat Enterprise Linux 10, classified under Improper Handling of Case Sensitivity. CVSS score: 3.0/10. Published 2026-09-09.
- How severe is CVE-2026-87876?
- Low severity. CVSS v3 base score is 3.0 out of 10.