CVE-2026-34990 | OpenPrinting CUPS up to 2.4.16 on Linux IPP Service /admin/ improper authentication

VDB-355214 · CVE-2026-34990 · GCVE-0-2026-34990 OPENPRINTING CUPS UP TO 2.4.16 ON LINUX IPP SERVICE /ADMIN/ IMPROPER AUTHENTICATION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.1 $0-$5k 0.96+ Summaryinfo A vulnerability was found in OpenPrinting CUPS up to 2.4.16 on Linux. It has been declared as critical. This affects an unknown part of the file /admin/ of the component IPP Service. Such manipulation leads to improper authentication. This vulnerability is traded as CVE-2026-34990. An attack has to be approached locally. There is no exploit available. Detailsinfo A vulnerability, which was classified as critical, has been found in OpenPrinting CUPS up to 2.4.16 on Linux. Affected by this issue is some unknown processing of the file /admin/ of the component IPP Service. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability. CVE summarizes: OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, a local unprivileged user can coerce cupsd into authenticating to an attacker-controlled localhost IPP service with a reusable Authorization: Local ... token. That token is enough to drive /admin/ requests on localhost, and the attacker can combine CUPS-Create-Local-Printer with printer-is-shared=true to persist a file:///... queue even though the normal FileDevice policy rejects such URIs. Printing to that queue gives an arbitrary root file overwrite; the PoC below uses that primitive to drop a sudoers fragment and demonstrate root command execution. At time of publication, there are no publicly available patches. The advisory is available at github.com. This vulnerability is handled as CVE-2026-34990 since 03/31/2026. The exploitation is known to be easy. Local access is required to approach this attack. Technical details are known, but there is no available exploit. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. Productinfo Type Printing Software Vendor OpenPrinting Name CUPS Version 2.4.0 2.4.1 2.4.2 2.4.3 2.4.4 2.4.5 2.4.6 2.4.7 2.4.8 2.4.9 2.4.10 2.4.11 2.4.12 2.4.13 2.4.14 2.4.15 2.4.16 Website Product: https://github.com/OpenPrinting/cups/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 5.3 VulDB Meta Temp Score: 5.1 VulDB Base Score: 5.3 VulDB Temp Score: 5.1 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Improper authentication CWE: CWE-287 CAPEC: 🔒 ATT&CK: 🔒 Physical: Partially Local: Yes Remote: No Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: no mitigation known Status: 🔍 0-Day Time: 🔒 Timelineinfo 03/31/2026 CVE reserved 04/03/2026 +3 days Advisory disclosed 04/03/2026 +0 days VulDB entry created 04/03/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: github.com Status: Not defined CVE: CVE-2026-34990 (🔒) GCVE (CVE): GCVE-0-2026-34990 GCVE (VulDB): GCVE-100-355214 Entryinfo Created: 04/03/2026 23:33 Changes: 04/03/2026 23:33 (68) Complete: 🔍 Cache ID: 99:DD5:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸