CVE-2026-87739Network attack vectorHinoki check available

Unauthenticated report disclosure via missing permission checks

Published Sep 24, 2026 · Updated Sep 24, 2026

Authorization bypass in PaperCut NG/MF before 25.0.13 and 26.0.0 through 26.0.4 allows remote attackers to read sensitive report data. The report-generation path accepts a user-controlled request without completing authentication or evaluating the requester's permissions before generating the report. No credentials or user interaction are required; network access to the Application Server is sufficient to retrieve information contained in generated reports.

CVSS severity6.9
Medium
EPSS probability0.38%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Authorization bypass in PaperCut NG/MF before 25.0.13 and 26.0.0 through 26.0.4 allows remote attackers to read sensitive report data. The report-generation path accepts a user-controlled request without completing authentication or evaluating the requester's permissions before generating the report. No credentials or user interaction are required; network access to the Application Server is sufficient to retrieve information contained in generated reports.

The record

CVE
CVE-2026-87739
Published
Sep 24, 2026
Updated
Sep 24, 2026
Vendor
PaperCut
Product
PaperCut NG/MF
Classifications
CWE-639, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 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 <25.0.13
  2. Affected versionversion=26.0.0 <26.0.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PaperCut · PaperCut NG/MFversion=0 <25.0.13; version=26.0.0 <26.0.5

Published CVSS scores

6.9PaperCutCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/AU:Y

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

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Your stack

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