CVE-2026-82078

CRITICAL CISA KEV
Published Aug 28, 2026 Modified Sep 1, 2026 CWE-470

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.

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CVSS v3.1 Score

9.1
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0384
Probability of exploitation
0.90%
Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

CISA Known Exploited Vulnerability

This vulnerability is actively exploited in the wild.

Added: Aug 31, 2026 Remediation due: Sep 14, 2026

Weakness Type (CWE)

CWE-470 CWE-470

Affected Products

Vendor Product
papercut papercut_mf
papercut papercut_mf
papercut papercut_mf
papercut papercut_ng
papercut papercut_ng
papercut papercut_ng

References

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 9.1 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.
How severe is CVE-2026-82078? +
CVE-2026-82078 has a CVSS v3.1 score of 9.1 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0384, placing it in the 1th percentile for exploitation probability.
What products are affected by CVE-2026-82078? +
CVE-2026-82078 affects products from papercut, specifically: papercut_mf, papercut_ng. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2026-82078? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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