CVE-2026-81578
Missing Authentication for Critical Function in PaperCut NG/MF. CISA confirmed attackers exploit it and added it to its Known Exploited Vulnerabilities catalog on 31 August 2026.
- Product
- PaperCut NG/MF
- Added to CISA's catalog
- Federal fix-by date
- Ransomware
- No known use in ransomware campaigns
- Sources
- CISA’s catalog, NVD entry
CISA’s description.
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.
More from PaperCut this year.
- CVE-2026-82078 Unsafe Reflection, added
- CVE-2023-27351 Improper Authentication, added
Every flaw CISA confirmed exploited in the last 30 days is on the exploit watch. This is not security advice. Check the vendor’s advisory before acting. From CISA’s catalog of 4 November 2026.