CVE-2026-82078

9.4 CRITICAL 63% exploit odds Drop everything exploited in the wild Fix listed Code execution Server

What it is

An unsafe dynamic class loading vulnerability exists in the database connection utilities of PaperCut MF and PaperCut NG. The application instantiates database driver classes based on configurable driver names without validating against an allowlist of approved drivers. If an attacker can manipulate system configuration parameters, this enables the execution of arbitrary Java bytecode residing on the application classpath under the security context of the PaperCut server process.

At a glance

Exploitability: Can be exploited over the network with an admin-level account. High risk of data exposure, data tampering, service disruption.
In the wild: CISA lists this as exploited in real attacks. Treat as urgent.
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2026-08-28 00:13 UTC ReservedThe CVE id was reserved by its CNA
2026-08-28 16:18 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-08-31 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
2026-09-14 Remediation deadlineCISA's due date for federal agencies to fix it
2026-09-14 00:16 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
Exploit odds: 63.0% in the next 30 days (EPSS).
Severity: 9.4 CRITICAL (CVSS).
Fix: a patch or advisory is linked.
It meets the bar for Drop everything: critical, and exploited or very likely to be.

Details

Published: 2026-08-28 16:18 UTC
Last modified: 2026-09-14 00:16 UTC
Added to CISA KEV: 2026-08-31
Exploit probability: 63.0% · EPSS, next 30 days
Weakness: CWE-470
Record status: Analyzed

Affected

Papercut Mf < 24.1.9
Papercut Mf < 25.0.12
Papercut Mf < 26.0.4
Papercut Ng < 24.1.9
Papercut Ng < 25.0.12
Papercut Ng < 26.0.4

Attack profile CVSS 4.0 · 9.4

Attack vector: Network
Complexity: Low
Attack requirements: None
Privileges needed: High
User interaction: None
Confidentiality: High
Integrity: High
Availability: High

Raw vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/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:X

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2026-82078.md and follow it. Check whether this project is affected by CVE-2026-82078. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record