CVE-2026-81578PaperCut NG/MF Missing Authentication for Critical Function Vulnerability
- Product
- PaperCut NG/MF
- Added to CISA KEV
- August 31, 2026
- Deadline for US federal agencies
- September 14, 2026
- Known ransomware use
- Not known
- EPSS, next 30 days
- 84%, in the top 1% of scored CVEs (Oct 25, 2026)
- Weakness
- CWE-306 Missing Authentication
What CISA says
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.
What CISA asks you to do
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.
Sources
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Data from CISA's Known Exploited Vulnerabilities catalog (public domain) and FIRST EPSS, refreshed hourly. Rheono did not find or test this vulnerability; this page summarizes public sources.