CVE-2026-5115
Papercut Mf ≤ 25.0.5
Raw vector
CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XCVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). EPSS scores by FIRST (EPSS SIG), generated by Empirical Security. Risk Priority is our own derived reading, not an NVD score.
Summary
CVE-2026-5115 is a low-severity Cleartext Transmission of Sensitive Information (CWE-319) vulnerability in Papercut Mf. Its CVSS base score is 3.6 (Low).
Operationally, exploitation aligns with the MITRE ATT&CK technique Network Sniffing (T1040); ranked at the 5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified map to SC-8 (Transmission Confidentiality and Integrity) — see the control section below for these in your framework.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
CVE-2026-5115 is a session hijacking vulnerability in the PaperCut NG/MF Embedded application, specifically the version designed for Konica Minolta multi-function devices. This software interface runs directly on the device's touch screen and communicates with a PaperCut server. The flaw stems from an insecure communication channel that leaks data, including sensitive information that could enable further attacks on the device. The vulnerability carries a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N) and is associated with CWE-319 (Cleartext Transmission of Sensitive Information). It was internally discovered and published on 2026-03-31.
Remote attackers with network access can exploit this vulnerability without requiring authentication, privileges, or user interaction. By intercepting the insecure channel, they can obtain leaked sensitive data to mount attacks on the device itself, steal additional data, or conduct phishing against end users.
The PaperCut security bulletin provides details on mitigation: https://www.papercut.com/kb/Main/papercut-ng-mf-security-bulletin-march-2026/.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-17273
Vulnerability Data
The PaperCut NG/MF (specifically, the embedded application for Konica Minolta devices) is vulnerable to session hijacking. The PaperCut NG/MF Embedded application is a software interface that runs directly on the touch screen of a multi-function device. It was internally discovered…
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that the communication channel between the embedded application and the server was insecure, which could leak data including sensitive information that may be used to mount an attack on the device. Such an attack could potentially be used to steal data or to perform a phishing attack on the end user.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
SC-8 directly requires protecting confidentiality of transmitted information, which structurally eliminates cleartext transmission of sensitive data.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Encryption of data-in-transit directly prevents cleartext transmission while the control also addresses integrity and availability.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
A.8.21 mandates identifying/implementing network service security features (explicitly including encryption and connection controls), formulating rules that cover authentication/authorization/monitoring/VPNs, and ensuring providers do the same; this stops cleartext transmission from being exploitable in the large majority of network channels, with a bounded remainder (e.g. internal non-networked flows or unaddressed legacy protocols).
Mandating cryptographic protection and stronger authentication on public networks stops the transmission of plaintext sensitive information.
A.5.17 mandates secure transmission of authentication information, removing cleartext transmission of that specific sensitive data, but does not address other sensitive information transmitted in cleartext, so it removes only a subset of CWE-319 instances.
A.8.5 requires that passwords not be transmitted in cleartext, so applying it removes that specific instance of cleartext transmission, but it does not address other sensitive information sent in cleartext.