MSRXCVE-2026-82078
CVE-2026-82078
PaperCut NG/MF Unsafe Reflection Vulnerability
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CVSS 4.0 · CNA
chance of exploitation in the next 30 days (EPSS; in the top 1% of all CVEs)
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.
Scores
Affected products
- papercut papercut mf: < 24.1.9; ≥ 25.0.2, < 25.0.12; ≥ 26.0.2, < 26.0.4
- papercut papercut ng: < 24.1.9; ≥ 25.0.2, < 25.0.12; ≥ 26.0.2, < 26.0.4
Weakness: CWE-470
3 references (advisories, patches, write-ups)
- https://www.papercut.com/kb/Main/security-bulletin-27-aug-2026-urgent-security-advisory/ · Patch, Vendor Advisory
- https://github.com/rapid7/metasploit-framework/pull/21842 · Issue Tracking, Patch
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-82078 · Patch, Third Party Advisory, US Government Resource
Sources: NVD, CVE.org, FIRST EPSS. Missing ones did not answer or have no record yet.