ACTIVELY EXPLOITED
CVE-2026-81578: PaperCut NG/MF Missing Authentication for Critical Function Vulnerability
| Vendor | PaperCut |
|---|---|
| Product | NG/MF |
| Actively exploited | Yes |
| Added to CISA KEV | 31 Aug 2026 |
| CISA federal deadline | 14 Sep 2026 |
| Weakness (CWE) | CWE-306 |
Required action (CISA's text)
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.
Description (NVD)
PaperCut NG/MF contains a missing authentication for critical function vulnerability which allows an unauthenticated remote attacker to modify certain system configurations. This vulnerability can be chained with CVE-2026-82078.
SOURCES
Other PaperCut flaws
- CVE-2026-82078: PaperCut NG/MF Unsafe Reflection Vulnerability
- CVE-2023-27351: PaperCut NG/MF Improper Authentication Vulnerability
- CVE-2023-2533: PaperCut NG/MF Cross-Site Request Forgery (CSRF) Vulnerability
- CVE-2023-27350: PaperCut MF/NG Improper Access Control Vulnerability
Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.