PaperCut NG/MF Zero-day Vulnerability Exploited in the Attacks (CVE-2026-82078 & CVE-2026-81578)
PaperCut NG/MF zero-days CVE-2026-82078 and CVE-2026-81578 are actively exploited, chaining to pre-auth RCE on the Application Server.
PaperCut issued an urgent security advisory for two actively exploited vulnerabilities, CVE-2026-82078 and CVE-2026-81578, affecting all versions of PaperCut NG and PaperCut MF. When chained, the flaws enable pre-authentication remote code execution on the PaperCut Application Server, originating from a request-confusion and authorization gap. PaperCut is widely deployed for print management in enterprises and education, making unpatched instances a high-value target.
- Two zero-days affect all PaperCut NG and MF versions.
- Chaining the flaws yields pre-authentication remote code execution.
- Root cause is a request-confusion and authorization gap.
- Vendor shipped an urgent security advisory with fixes.
- Vendors
- PaperCut
- Products
- PaperCut NGPaperCut MF
- Organizations
- Qualys
Vulnerabilities mentioned
All| CVE | Vulnerability | CVSS | EPSS | Signals | Published |
|---|---|---|---|---|---|
CVE-2026-82078+1 related CVE | Unsafe Reflection RCE in PaperCut NG/MF, Chained with Auth Bypass in Attacks | 9.4 group max | 61% | KEV | KEV |
From the original article
PaperCut released an Urgent Security Advisory to address two actively exploited vulnerabilities, tracked as CVE-2026-82078 & CVE-2026-81578, impacting all versions of PaperCut NG and PaperCut MF. When chained together, these vulnerabilities can enable pre-authentication remote code execution in the PaperCut Application Server. The flaw originates from a request-confusion/authorization gap.
By Diksha Ojha · threatprotect.qualys.com
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