Vulnerability · Published Aug 3, 2026 · Assigned by PaperCut
CVE-2026-8793PaperCut NG/MF: Insufficient brute-force protection
Medium 6.9
In plain English
A medium-severity security flaw in PaperCut NG/MF from PaperCut. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| PaperCut | PaperCut NG/MF | 0 – before 26.0.3 |
Weakness: CWE-307 · Vector: 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