CVE-2026-8793 PUBLISHED

PaperCut NG/MF: Insufficient brute-force protection

Assigner: PaperCut
Reserved: 17.05.2026 Published: 03.08.2026 Updated: 03.08.2026

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.

Metrics

CVSS 4.0

CVSS 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
CVSS Score: 6.9

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	Low
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	PaperCut
Product	PaperCut NG/MF
Versions	Default: unaffected affected from 0 to 26.0.3 (excl.)

Credits

Vivien Lebas reporter

References

https://www.papercut.com/kb/Main/papercut-ng-mf-security-bulletin-3-aug-2026/

Problem Types

CWE-307 Improper restriction of excessive authentication attempts CWE