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CVE-2026-8793

MediumPublished

PaperCut NG/MF: Insufficient brute-force protection

Published: Aug 3, 2026
Updated: Aug 3, 2026
Assigning CNA: PaperCut
Evidence observed: Aug 15, 2026

Primary CVSS

6.9/ 10Medium

nvd · CVSS 4.0

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

EPSS probability estimate

0.4%

Low · next 30 days

Percentile: 32.9%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

PaperCut NG/MF does not properly restrict excessive authentication attempts within its login component. An unauthenticated remote attacker can exploit this vulnerability to perform unrestricted brute-force or credential-stuffing attacks without triggering account lockout or rate-limiting mechanisms in some configurations.

Sources

CVE-2026-8793PoC
esponsible disclosure write-ups for CVE-2026-8793 - PaperCut NG 25.0.11
CVE-2026-8794PoC
Username Enumeration via Authentication Timing Side-Channel in PaperCut NG

Responsible use

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