What is 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.
Timeline
- 2026-08-28Published to the U.S. National Vulnerability Database (NVD)
- 2026-08-31Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
- 2026-09-01NVD record last updated
- 2026-09-14CISA federal remediation deadline (BOD 22-01)
CISA Known Exploited Vulnerability
PaperCut NG/MF Missing Authentication for Critical Function Vulnerability
Affected product
PaperCut NG/MF
NVD also lists CPE entries for: Papercut Mf, Papercut Ng
Remediation Steps
- Check CISA's Known Exploited Vulnerabilities Catalog for detailed technical advisory and affected product information
- Identify systems using the affected product in your environment
- Apply the vendor security patch immediately upon availability
- Monitor security logs for indicators of exploitation
References
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-81578
- https://www.papercut.com/kb/Main/security-bulletin-27-aug-2026-urgent-security-advisory/
- https://github.com/rapid7/metasploit-framework/pull/21842
- https://nvd.nist.gov/vuln/detail/CVE-2026-81578
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Referenced in our briefings & reports
- Vulnerability Priority Report – Week 5 of August 2026 (August 31 – September 6)
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🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.