Low severity · published Sep 9, 2026
CVE-2026-87876
Cups: openprinting cups: remaining case-insensitive username matching in scheduler side paths (cve-2026-27447 follow-up)
3.0
CVSS
0.3%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
Attack vector
Adjacent
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 26% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat Enterprise Linux 10 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 6 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 7 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 8 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 9 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Hardened Images · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat OpenShift Container Platform 4 · Red Hat
All versions, or not specified · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-87876
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-87876
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:67568
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-87876
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2530991
github.com
https://github.com/OpenPrinting/cups/commit/88e67c00c130a45f3a1edf36686f7a0b2982fef8
github.com
https://github.com/OpenPrinting/cups/commit/f56844dbe4a54a9f8e1aeb3b913fbee614156bdb
github.com
https://github.com/OpenPrinting/cups/security/advisories/GHSA-r8jp-q6fh-g5r2
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