CVE-2026-8794
PaperCut NG/MF: User enumeration via timing attack
- Published
- Aug 3, 2026
- Updated
- Aug 3, 2026
- Assigning CNA
- PaperCut
- Evidence observed
- Aug 15, 2026
Primary CVSS
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:XLow · next 30 days
- Percentile
- 32.5%
- 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 contains an observable timing discrepancy in its authentication component. An unauthenticated remote attacker can exploit this vulnerability to perform username enumeration by measuring response times during login attempts. The system executes a password hash comparison only when a valid account is supplied, creating a measurable timing oracle that reveals account existence.
Sources
2Username Enumeration via Authentication Timing Side-Channel in PaperCut NG
esponsible disclosure write-ups for CVE-2026-8793 - PaperCut NG 25.0.11
Responsible use
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