CVE-2026-82078Known exploitationNetwork attack vectorHinoki check available

Java bytecode execution via unvalidated driver class

Published Aug 28, 2026 · Updated Aug 29, 2026

Unsafe dynamic class loading in affected PaperCut NG/MF releases allows remote authenticated users to execute Java bytecode. The database connection utilities instantiate a driver named in configurable system parameters without restricting it to an approved class allowlist. Administrative control of those parameters is required; affected versions are before 24.1.10, 25.0.13, or 26.0.5 by release branch.

CVSS severity9.4
Critical
EPSS probability3.57%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Unsafe dynamic class loading in affected PaperCut NG/MF releases allows remote authenticated users to execute Java bytecode. The database connection utilities instantiate a driver named in configurable system parameters without restricting it to an approved class allowlist. Administrative control of those parameters is required; affected versions are before 24.1.10, 25.0.13, or 26.0.5 by release branch.

The record

CVE
CVE-2026-82078
Published
Aug 28, 2026
Updated
Aug 29, 2026
Vendor
PaperCut
Product
PaperCut NG/MF
Classifications
CWE-470, T1620
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 29, 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 <24.1.10, 25.0.13, 26.0.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

PaperCut · PaperCut NG/MFversion=0 <24.1.10, 25.0.13, 26.0.5

Published CVSS scores

9.4PaperCutCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

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)
Vectornetwork
Privilegesadmin
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-470Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')
T1620Reflective Code Loading

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.

Reported exploitation

Technologies

Your stack

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Your stack

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