Known exploited · PaperCut
CVE-2023-2533: PaperCut NG/MF Cross-Site Request Forgery (CSRF) Vulnerability
What it is
PaperCut NG/MF contains a cross-site request forgery (CSRF) vulnerability, which, under specific conditions, could potentially enable an attacker to alter security settings or execute arbitrary code.
- Vendor
- PaperCut
- Product
- NG/MF
- Added to KEV
- July 28, 2025
- CISA due date
- August 18, 2025
- Ransomware use
- Unknown
What CISA requires
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Forensic triage
No
What to do now
- Find every instance of NG/MF you run, including the forgotten ones, and check its version against the vendor advisory.
- Apply the vendor's fix or mitigation, before August 18, 2025 if you are bound by CISA's deadline, sooner if it faces the internet.
- Assume it was tried against you already: look for signs of exploitation from the date it was added, not from the day you patched.
References
H2 Security
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Start freeSource: CISA Known Exploited Vulnerabilities Catalog (public domain), catalog version 2026.10.01.