What is CVE-2026-82078?
An unsafe dynamic class loading vulnerability exists in the database connection utilities of PaperCut MF and PaperCut NG. The application instantiates database driver classes based on configurable driver names without validating against an allowlist of approved drivers. If an attacker can manipulate system configuration parameters, this enables the execution of arbitrary Java bytecode residing on the application classpath under the security context of the PaperCut server process.
Timeline
- 2026-08-28Published to the U.S. National Vulnerability Database (NVD)
- 2026-08-31Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
- 2026-09-02First covered in a defend.network daily briefing
- 2026-09-14CISA federal remediation deadline (BOD 22-01)
- 2026-09-14NVD record last updated
CISA Known Exploited Vulnerability
PaperCut NG/MF Unsafe Reflection Vulnerability
Affected product
PaperCut NG/MF
NVD also lists CPE entries for: Papercut Mf, Papercut Ng
Remediation Steps
- Apply the vendor patch to address the remote code execution vulnerability
- Audit logs for malicious script execution or unauthorized commands
- Verify integrity of system binaries and scripts on affected servers
- Restrict inbound access to PaperCut services to trusted networks
References
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-82078
- 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-2026-82078
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Referenced in our briefings & reports
- Vulnerability Priority Report – Week 4 of September 2026 (September 28 – October 4)
- Vulnerability Priority Report – Week 3 of September 2026 (September 21 – 27)
- Vulnerability Priority Report – Week 2 of September 2026 (September 14 – 20)
- Vulnerability Priority Report – Week 1 of September 2026 (September 7 – 13)
- Vulnerability Priority Report – Week 5 of August 2026 (August 31 – September 6)
- JFrog Artifactory, Langflow critical flaws exploited; TeamPCP arrested (2026-09-02)
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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.