# CVE-2026-81578

## Summary

- **CVE ID:** CVE-2026-81578
- **Severity:** HIGH
- **CVSS Score:** 8.8 (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)
- **CWE:** CWE-305
- **Published:** Aug 28, 2026
- **Last Modified:** Sep 1, 2026

## Description

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.

## Affected Products

- PaperCut — PaperCut MF/NG (0)

## References

- [CNA](https://www.papercut.com/kb/Main/security-bulletin-27-aug-2026-urgent-security-advisory/)
- [CISA-ADP](https://github.com/rapid7/metasploit-framework/pull/21842)
- [CISA-ADP](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-81578)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 1.62%
- **EPSS Percentile:** 74.6

## Known Exploited Vulnerabilities (KEV)

- **Date Added:** Aug 28, 2026
- **Due Date:** Sep 11, 2026

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._