Vulnerability in Papercut Mf
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.635 (99.2th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.017 · newest: 0.635 · change: +0.618
Affected products
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: 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.
Public proof-of-concept exploits
References
- eb41dac7-0af8-4f84-9f6d-0272772514f4 (Patch, Vendor Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Patch, Issue Tracking)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource, Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-82078?
- CVE-2026-82078 is a critical-severity vulnerability in Papercut Mf, classified under Use of Externally-Controlled Input to Select Classes or Code (Unsafe Reflection). CVSS score: 9.1/10. Published 2026-08-28.
- How severe is CVE-2026-82078?
- Critical severity. CVSS v3 base score is 9.1 out of 10.
- Is CVE-2026-82078 known to be exploited?
- Yes. CVE-2026-82078 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-08-31), indicating it is being actively exploited. 1 public proof-of-concept repositories are indexed.