CVE-2026-87876

EUVD-2026-75089
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
3 LOW
ADJACENT_NETWORK
LOW
LOW
CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 24.69%
Debian logo
Debian Releases
Debian Product
Codename
cups
bookworm
vulnerable
bookworm (security)
vulnerable
forky
vulnerable
sid
2.4.20-1
fixed
trixie
vulnerable
trixie (security)
vulnerable
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
cups
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
needs-triage
xenial
needs-triage
Common Weakness Enumeration
References
https://access.redhat.com/errata/RHSA-2026:67568
https://access.redhat.com/security/cve/CVE-2026-87876
https://bugzilla.redhat.com/show_bug.cgi?id=2530991
https://github.com/OpenPrinting/cups/commit/88e67c00c130a45f3a1edf36686f7a0b2982fef8
https://github.com/OpenPrinting/cups/commit/f56844dbe4a54a9f8e1aeb3b913fbee614156bdb
https://github.com/OpenPrinting/cups/security/advisories/GHSA-r8jp-q6fh-g5r2
https://github.com/OpenPrinting/cups/security/advisories/GHSA-r8jp-q6fh-g5r2