SECURELYN
Free ScanFree consultation

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.

Scores

8.8
CVSS 8.8 out of 10, high severity.
85.6%
EPSS 85.6% chance of exploitation in the next 30 days.

The facts

Published
28 August 2026
Last changed
14 September 2026
NVD status
Analyzed
Severity
High, CVSS 8.8 out of 10 (version 4.0)
CVSS: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…
Weakness
Affects
  • papercut papercut mf
  • papercut papercut ng
Known exploited
Yes. CISA added it to the Known Exploited Vulnerabilities catalogue on 31 August 2026.
EPSS
85.6% chance of exploitation activity in the next 30 days (percentile 100).

Is there a Securelyn advisory?

Not yet. Securelyn writes plain-English advisories for the flaws that matter most to businesses. Subscribe to the digest to hear about them.

References