Multiple vulnerabilities in Papercut (August 28, 2026)
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.
Multiple vulnerabilities were discovered in Papercut. They allow an attacker to bypass authentication and execute arbitrary code remotely. Papercut indicates that these vulnerabilities are being actively exploited. The publisher explains that the patch blocks requests...
CSIRTS triage
- What
- Papercut contains authentication bypass and remote code execution vulnerabilities.
- Who is affected
- All Papercut installations are affected; vulnerabilities are being actively exploited in the wild.
- Urgency
- Critical; active exploitation confirmed for authentication bypass and RCE vulnerabilities.
- Action
- Apply Papercut security patches immediately or implement request filtering as indicated by the publisher.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-1095/
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-2026-82078: PaperCut NG/MF Unsafe Reflection Vulnerabilitycisa-kev
- criticalexploitedCVE-2026-81578: PaperCut NG/MF Missing Authentication for Critical Function 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
- unknownexploitedNCSC-2026-0334 [1.00] [M/H] Vulnerabilities patched in PaperCut MF and PaperCut NG from PaperCutncsc-nl
Recent advisories for Papercut
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- unknownexploitedPaperCut security advisory (AV26-858) – Update 2cccs · 2026-08-31
- unknownexploitedPaperCut Multiple Vulnerabilitieshkcert · 2026-08-31
- criticalexploitedCVE-2026-81578: PaperCut NG/MF Missing Authentication for Critical Function Vulnerabilitycisa-kev · 2026-08-31
- criticalexploitedCVE-2026-82078: PaperCut NG/MF Unsafe Reflection Vulnerabilitycisa-kev · 2026-08-31
- criticalexploitedCVE-2026-82078: An unsafe dynamic class loading vulnerability exists in the database connection utilities of P…nvd · 2026-08-28
- criticalexploitedCVE-2026-81578: An improper access control vulnerability exists in the web management interface of PaperCut MF…nvd · 2026-08-28
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