What is CVE-2026-82077?
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.
The record classifies CVE-2026-82077 under weakness classes CWE-22, CWE-78. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 20 days ago.
Severity and exploitation probability
- CVSS v4.0 base score
- 7.3 — High (derived from score)
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P - EPSS (FIRST)
- 0.7% probability of exploitation in the next 30 days, higher than 53.1% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 5.8/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-09-24, last modified 2026-09-25
Is CVE-2026-82077 being exploited?
It currently carries a trending score of 44 in the Threadlinqs vulnerability feed.
Affected products and versions
- PaperCut: NG/MF
How to fix CVE-2026-82077
No vendor patch reference has been recorded for CVE-2026-82077 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.
Threat activity tracking CVE-2026-82077
1 tracked threat in the Threadlinqs corpus references CVE-2026-82077, either in the campaign’s CVE list or as an indicator on the campaign record.
- PaperCut NG/MF Chained Zero-Day RCE (CVE-2026-82078 & CVE-2026-81578) Under Active Exploitation — CRITICAL · 2026-08-28
Sources
Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on .