Live › vulnerability › CVE-2026-82078
Go to dashboardPaperCut NG/MF unsafe class loading in the database connector (CWE-470). Driver class names come from configuration with no allowlist, so arbitrary classpath bytecode runs as the PaperCut server process. It is chained in the wild with CVE-2026-81578, an unauthenticated config change, which gives unauthenticated RCE. Attackers have dropped SimpleHelp and AnyDesk after exploitation. All NG and MF versions are affected.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 5h before NVD. All times on this page are UTC.
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.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| PaperCut NG/MF | vendor | – | – |
| PaperCut NG | vendor | all versions before 26.0.5 / 25.0.13 / 24.1.10 | 26.0.5, 25.0.13, 24.1.10 |
| PaperCut MF | vendor | all versions before 26.0.5 / 25.0.13 / 24.1.10 | 26.0.5, 25.0.13, 24.1.10 |
| papercut mf | vendor | < 24.1.9 |
| 24.1.9 |
| papercut mf | vendor | >= 25.0.2, < 25.0.12 | 25.0.12 |
| papercut mf | vendor | >= 26.0.2, < 26.0.4 | 26.0.4 |
| papercut ng | vendor | < 24.1.9 | 24.1.9 |
| papercut ng | vendor | >= 25.0.2, < 25.0.12 | 25.0.12 |
| papercut ng | vendor | >= 26.0.2, < 26.0.4 | 26.0.4 |
26.0.5, 25.0.13 or 24.1.10, or on Emergency Patch Release 1 or 2, is exposedNo suitable driver found for jdbc:no:x, DB URL: jdbc:derby:memory:pwn;create=true, Database error looking up cardID: VALUES CAST, or missing or truncated server.logRemote Access Service (SimpleService.exe) and unexpected AnyDesk installs26.0.5, 25.0.13 or 24.1.10 (these replace the emergency patches; Emergency Patch Release 3 is protective)Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
PaperCut NG/MF contains an unsafe reflection vulnerability that allows an attacker to manipulate system configuration parameters and execute arbitrary Java bytecode residing on the application classpath under the security context of the PaperCut server process. This vulnerability can be chained with CVE-2026-81578.
CISA 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.
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