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.
Actively exploited
- In the CISA exploited-vulnerabilities catalogue since Aug 31, 2026
- US federal agencies must remediate it by Sep 14, 2026 (BOD 22-01)
- Attacked 1 day before the vulnerability was made public
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Source: CISA KEV · Aug 31, 2026 Aug 31, 2026 Aug 30, 2026 Aug 28, 2026 Aug 28, 2026 Aug 28, 2026
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HAffected products
| Vendors | Prodotto | Versioni |
|---|---|---|
| papercut | papercut mf | < 24.1.9 |
| papercut | papercut ng | < 24.1.9 |
Related articles
VulnerabilitiesPaperCut Under Attack: Two Flaws Allow Pre-Authentication RCE, Race to Patch
Active exploitation of two PaperCut vulnerabilities allows pre-authentication RCE in MF and NG products. Patch immediately to secure systems.
VulnerabilitiesPaperCut: Two Exploited Zero-Days and a Double Emergency Fix
PaperCut releases emergency patches for two exploited zero-day vulnerabilities, CVE-2026-81578 and CVE-2026-82078, allowing authentication bypass and arbitrary code execution.
This product uses the NVD API but is not endorsed or certified by the NVD.