CVE-2026-82077: PaperCut NG/MF: Remote Code Execution via Scan2Fax

Severity: high (CVSS 7.3 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-24 · updated 2026-10-13
Weakness: CWE-22

Description

An improper limitation of a pathname to a restricted directory (path traversal) vulnerability in the Scan-to-Fax component of PaperCut NG and PaperCut MF allows an authenticated administrator to execute arbitrary commands on the underlying host via crafted fax provider settings.

Affected products

PaperCut NG/MF: before 24.1.10; from 25.0.0 before 25.0.13; from 26.0.0 before 26.0.5 — fixed in 24.1.10, 25.0.13, 26.0.5

How to fix

Upgrade to a fixed version: PaperCut NG/MF 24.1.10, 25.0.13, 26.0.5. Check the vendor advisory for mitigations.

In the news

Death By A Thousand PaperCuts (PaperCut Pre-Auth RCE Chain and Patch Bypasses WT-2026-0141-0144/CVE-2026-82077/CVE-2026-82078/CVE-2026-81578)

References

https://www.papercut.com/kb/Main/security-bulletin-sep-2026/

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