NCSC-2026-0334 [1.00] [M/H] Vulnerabilities patched in PaperCut MF and PaperCut NG from PaperCut
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
PaperCut has patched vulnerabilities in PaperCut MF and PaperCut NG. An unauthenticated attacker may be able to successively exploit the vulnerabilities to take over a PaperCut environment and execute arbitrary code on it. To do so, the attacker must send malicious network traffic to the vulnerable PaperCut environment.
CSIRTS triage
- What
- PaperCut has patched vulnerabilities that allow unauthenticated attackers to chain exploits for environment takeover and arbitrary code execution.
- Who is affected
- All PaperCut MF and NG deployments accessible over the network.
- Urgency
- High; unauthenticated remote code execution risk via chained exploitation of patched vulnerabilities.
- Action
- Apply PaperCut patches addressing CVE-2026-82078 and CVE-2026-81578 immediately.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://advisories.ncsc.nl/advisory?id=NCSC-2026-0334
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Exploitation confirmedCVE-2026-82078Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 58% of all EPSS-scored CVEs.
- Exploitation confirmedCVE-2026-81578Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 53% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-82078 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-81578 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- unknownexploitedPaperCut security advisory (AV26-858) – Update 2cccs
- criticalexploitedCISA Adds Two Known Exploited Vulnerabilities to Catalogcisa
- unknownexploitedPaperCut Multiple Vulnerabilitieshkcert
- criticalexploitedCVE-2026-81578: PaperCut NG/MF Missing Authentication for Critical Function Vulnerabilitycisa-kev
- criticalexploitedCVE-2026-82078: PaperCut NG/MF Unsafe Reflection Vulnerabilitycisa-kev
- criticalexploitedCVE-2026-82078: An unsafe dynamic class loading vulnerability exists in the database connection utilities of P…nvd
- criticalexploitedCVE-2026-81578: An improper access control vulnerability exists in the web management interface of PaperCut MF…nvd
- unknownexploitedMultiple vulnerabilities in Papercut (August 28, 2026)cert-fr-avis
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