CVE-2026-5115

Session hijacking via insecure embedded-app channel

Published Mar 31, 2026 · Updated Mar 31, 2026

Session hijacking in PaperCut MF before 25.0.5 Standard or 25.0.9 Certified allows attackers to intercept sensitive data. The Konica Minolta embedded application communicates with the Application Server over an insecure channel, but PaperCut has not published the protocol or cryptographic defect. Exploitation requires the same local network, an affected model and setup combination, and passive user interaction; consequences are limited to intercepted data and end-user phishing.

CVSS severity7.5
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Session hijacking in PaperCut MF before 25.0.5 Standard or 25.0.9 Certified allows attackers to intercept sensitive data. The Konica Minolta embedded application communicates with the Application Server over an insecure channel, but PaperCut has not published the protocol or cryptographic defect. Exploitation requires the same local network, an affected model and setup combination, and passive user interaction; consequences are limited to intercepted data and end-user phishing.

The record

CVE
CVE-2026-5115
Published
Mar 31, 2026
Updated
Mar 31, 2026
Vendor
PaperCut
Product
PaperCut NG/MF
Classifications
CWE-319, T1557
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 31, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <25.0.5
  2. Affected versionversion=0 <25.0.9 (KM certified)

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

PaperCut · PaperCut NG/MFversion=0 <25.0.5; version=0 <25.0.9 (KM certified)

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.6PaperCutCVSS: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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-319Cleartext Transmission of Sensitive Information
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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