— Unscored

PaperCut NG/MF Unsafe Reflection Vulnerability

CVE-2026-82078 Exploited

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.

Being exploited in the wild

Catalogued 31 August 2026 · US federal remediation deadline 14 September 2026

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…

Exploit code is also public: Metasploit

Metasploitexploit/multi/http/papercut_ng_external_user_lookup_rce

Assessment

CVSS: Not yet scored
Severity: Unscored
Known exploited: Yes — listed in the CISA KEV catalog
Exploit availability: CISA KEV, Metasploit
Published: 31 August 2026
Last updated: 31 August 2026
Affected: PaperCut · NG/MF
Weakness: CWE-470

At the source

CISA KEV

References

https://www.cisa.gov/known-exploited-vulnerabilities-catalog

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