CVE-2026-82078

Description

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.

Scoring

• CVSS: 9.1 (CRITICAL, 3.1)
• EPSS exploitation probability: Not yet available
• EPSS percentile: Not yet available

CISA KEV status

• Added to KEV: 2026-08-31
• Remediation due date: 2026-09-14
• Known ransomware campaign use: Unknown

Weakness types (CWE)

• CWE-470

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

More from PaperCut

• CVE-2026-81578 — NG/MF
• CVE-2023-27351 — NG/MF
• CVE-2023-2533 — NG/MF
• CVE-2023-27350 — MF/NG