CVE-2026-81578

An improper access control vulnerability exists in the web management interface of PaperCut MF and PaperCut NG. Under specific conditions, unauthenticated remote requests targeting administrative functions can trigger backend actions prior to the completion of access validation checks. This allows an unauthenticated remote attacker to modify certain system configurations.

CVSS v4.0

8.8 HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/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

CVSS v3.1

9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.77% chance of exploitation in the next 30 days, 53th percentile

CISA KEV

added 2026-08-31

Published

2026-08-28

Updated

2026-09-01

Proof-of-concept exploits (1)

• yora1928/PaperCut-CVE-2026-81578-820781★ · 2026-08-29

References

• CVE Record
• NVD entry

Related

• CVE-2026-15748
• CVE-2026-82078
• CVE-2026-8157
• CVE-2026-8161
• CVE-2026-81562
• CVE-2026-8163