PaperCut NG/MF Unsafe Reflection Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 31/08/2026. Patch affected systems as an emergency.
| Package | Affected versions | Patched versions |
|---|---|---|
| papercut mf | ≥ 25.0.2, < 25.0.12≥ 26.0.2, < 26.0.4< 24.1.9 | 25.0.1226.0.424.1.9 |
| papercut ng | ≥ 25.0.2, < 25.0.12≥ 26.0.2, < 26.0.4< 24.1.9 | 25.0.1226.0.424.1.9 |
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.
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