EUVD-2026-75089Severity by source
AV:A/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
Adjacent vector for network print access, low privileges for authenticated CUPS user, no integrity or availability impact - only limited attribute disclosure.
Primary rating from Vendor (redhat).
CVSS VectorVendor: redhat
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Case-insensitive username comparisons in two code paths of the CUPS scheduler - printer ACL validation and private-attribute filtering - allow an authenticated adjacent-network attacker to bypass username-based access controls in configurations that rely on those ACLs. The bypass exposes private print attributes to users who should be excluded by ACL policy. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires all of the following: the attacker must be on the same network segment as the CUPS server (AV:A - not exploitable over the internet); the attacker must hold a valid low-privilege CUPS user account (PR:L); user interaction is required per the CVSS UI:R metric, likely meaning a legitimate user must have an active session or print job in progress; and the target CUPS deployment must be configured with username-based printer ACLs or private-attribute restrictions - the bypass is a no-op in deployments that do not use these features. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The overall risk profile is low. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Patch available per vendor advisory - consult the Red Hat CVE page at https://access.redhat.com/security/cve/CVE-2026-87876 for errata packages specific to your RHEL version (6, 7, 8, 9, 10), and review https://github.com/OpenPrinting/cups/security/advisories/GHSA-r8jp-q6fh-g5r2 for upstream CUPS fix commits; a specific patched release version is not independently confirmed from the available data. … Detailed patch versions, workarounds, and compensating controls in full report. |
Threat intelligence, references, and detailed analysis are available after sign-in.
More in Red Hat Enterprise Linux 10
View allHeap corruption via double-free in 389-ds-base's LDAP control parsing allows an unauthenticated remote attacker to crash
Remote code execution in Cockpit's web interface allows unauthenticated attackers to execute arbitrary commands on the h
Remote code execution in Samba's printing subsystem allows remote attackers to inject arbitrary shell commands via craft
Authentication bypass in 389 Directory Server (shipped as Red Hat Directory Server 11-13 and within RHEL 6-10) lets remo
Remote code execution and privilege escalation in HPLIP (HP Linux Imaging and Printing) affects the hpcups print filter
Unauthenticated privilege escalation in FreeIPA (Red Hat Identity Management) allows a remote attacker to gain genuine a
Remote code execution in libarchive on 32-bit systems allows unauthenticated attackers to execute arbitrary code via spe
HTTP request smuggling in Undertow (the embedded web server underpinning JBoss EAP, Red Hat Data Grid, and Apache Camel
HTTP request smuggling in Red Hat Undertow allows remote unauthenticated attackers to bypass front-end security controls
Out-of-bounds read in the GnuTLS DTLS handshake reassembly logic lets remote unauthenticated attackers trigger an intege
HTTP request smuggling in Undertow allows remote unauthenticated attackers to send `\r\r\r` as a header block terminator
Local privilege escalation in Performance Co-Pilot (PCP) on Red Hat Enterprise Linux 6 through 10 and OpenShift Containe
Same weakness CWE-178 – Improper Handling of Case Sensitivity
View allSame technique Information Disclosure
View allShare
External POC / Exploit Code
Leaving vuln.today