Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-87876— Cups: openprinting cups: remaining case-insensitive username matching in scheduler side paths (cve-2026-27447 follow-up)

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 CUPS 的调度器中，主授权路径之外存在两处大小写不敏感的用户名比较（分别位于打印机 ACL 校验和私有属性过滤模块中），在某些配置下可能导致基于用户名的访问控制被绕过。

CVSS 3.0 · Low

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-87876

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Cups: openprinting cups: remaining case-insensitive username matching in scheduler side paths (cve-2026-27447 follow-up)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
大小写敏感处理不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat Hardened Images - cpe:/a:redhat:hummingbird:1
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-87876

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-87876

请登录查看更多情报信息。

Other References for CVE-2026-87876 (3)

Same Patch Batch · Red Hat · 2026-09-09 · 8 CVEs total

CVE-2026-87766 8.8 HIGH Bubblewrap: bubblewrap: symlink traversal via /oldroot allows writing files outside sandbo
CVE-2026-18147 8.1 HIGH Freeipa: ipa: freeipa/idm: cross-site scripting vulnerability allows arbitrary code execut
CVE-2026-87874 8.1 HIGH Community.general: community.general: memcached cache plugin deserializes untrusted pickle
CVE-2026-87853 7.5 HIGH Sssd: sssd: idp authentication prefix comparison allows cross-user impersonation
CVE-2026-87872 6.8 MEDIUM Community.general: community.general: ocapi module_utils (ocapi_command, ocapi_info) hardc
CVE-2026-19729 4.9 MEDIUM Keycloak-services: keycloak-services: incomplete fix for arbitrary filesystem path probing
CVE-2026-87875 4.3 MEDIUM Cups: openprinting cups: heap out-of-bounds read in cupsutf32toutf8() via missing source-l

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-178

V. Comments for CVE-2026-87876

No comments yet

Leave a comment