CVE-2026-82078: papercut papercut_mf, papercut papercut_ng

CVSS 9.4 (critical) · listed as exploited by CISA since 2026-08-31 · published 2026-08-28

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.

Affected products (NVD): papercut papercut_mf, papercut papercut_ng

Fixed in (NVD): 24.1.9, 25.0.12, 26.0.4

Weakness: CWE-470

Source: NVD CVE-2026-82078

References

• https://www.papercut.com/kb/Main/security-bulletin-27-aug-2026-urgent-security-advisory/
• https://github.com/rapid7/metasploit-framework/pull/21842
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-82078

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