CVE-2026-82078

Q: How do I fix CVE-2026-82078?

Published advisories record a fix for 2 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Q: Is CVE-2026-82078 being actively exploited?

Yes. CVE-2026-82078 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. US federal agencies were required to remediate it by 2026-09-14. Treat it as a priority whatever its CVSS score says.

Q: How severe is CVE-2026-82078?

CVE-2026-82078 has a CVSS v3 base score of 9.1, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2026-82078 affect?

Published advisories record a fix for papercut mf (NVD), papercut ng (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

CRITICALCISA KEVEPSS 76th pctl

9.1

CVSS v3

NVD

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.

CWE-470

How to fix

Remediation Available

papercut mfNVD

Affected:>= 26.0.2, < 26.0.4Fixed in:26.0.4CVE-2026-82078derived from NVD

Affected:< 24.1.9Fixed in:24.1.9CVE-2026-82078derived from NVD

Affected:>= 25.0.2, < 25.0.12Fixed in:25.0.12CVE-2026-82078derived from NVD

papercut ngNVD

Affected:< 24.1.9Fixed in:24.1.9CVE-2026-82078derived from NVD

Affected:>= 26.0.2, < 26.0.4Fixed in:26.0.4CVE-2026-82078derived from NVD

Affected:>= 25.0.2, < 25.0.12Fixed in:25.0.12CVE-2026-82078derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredHigh

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.69%probability of exploitation in 30 days

76thpercentile

Elevated risk: more likely to be exploited than 76% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Remediation due: 2026-09-14

References

Patch3

Related Vulnerabilities

Other CWE-470 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-21985	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2024-4990	Critical	9.1	80%	-	-
CVE-2024-0200	High	7.2	72%	-	Fix
CVE-2022-30287	High	8.0	71%	-	Fix
CVE-2025-3600	High	7.5	24%	-	-
CVE-2018-5511	High	7.2	14%	-	-

Common questions

How do I fix CVE-2026-82078?

Published advisories record a fix for 2 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-82078 being actively exploited?

Yes. CVE-2026-82078 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. US federal agencies were required to remediate it by 2026-09-14. Treat it as a priority whatever its CVSS score says.

How severe is CVE-2026-82078?

CVE-2026-82078 has a CVSS v3 base score of 9.1, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-82078 affect?

Published advisories record a fix for papercut mf (NVD), papercut ng (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2026-82078

Markdown

[![CVE-2026-82078](https://tridentstack.com/cve/badge/CVE-2026-82078.svg)](https://tridentstack.com/cve/CVE-2026-82078)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-82078"><img src="https://tridentstack.com/cve/badge/CVE-2026-82078.svg" alt="CVE-2026-82078"></a>

This vulnerability is actively exploited in the wild

TridentStack Control detects known-exploited CVEs across your Windows, macOS, and Linux fleet and prioritizes their patches. 200 endpoints free forever.

Scan your fleet free Start freeThis CVE lookup is free and always will be.

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-14.