Multiple vulnerabilities in Papercut (August 3, 2026)

unknownCVE-2026-8794 CVE-2026-8793

Multiple vulnerabilities have been discovered in Papercut. They allow an attacker to cause data confidentiality breach and security policy bypass.

CSIRTS triage

vendor: Papercut product: Papercut Information disclosure Authentication bypass

What: Papercut contains multiple vulnerabilities allowing data confidentiality breach and security policy bypass.
Who is affected: All Papercut deployments are affected.
Urgency: High; security policy bypass and data exposure indicate authentication or access control flaws requiring urgent remediation.
Action: Apply Papercut security patches released August 3, 2026 and review access control policies.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-FR Avis de sécurité (FR · national-cert · site)
Severity: unknown
Published: 2026-08-03
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-0959/

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.

Low exploitation riskCVE-2026-87940.68% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 49% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-87930.68% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 49% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-8794	coverage & exploitation status	NVD · CVE.org
CVE-2026-8793	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

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.

unknownCVE-2026-8794: PaperCut NG/MF contains an observable timing discrepancy in its authentication component. An un…nvd · 2026-08-03
unknownCVE-2026-8793: PaperCut NG/MF does not properly restrict excessive authentication attempts within its login co…nvd · 2026-08-03
criticalexploitedCVE-2023-27351: PaperCut NG/MF Improper Authentication Vulnerabilitycisa-kev · 2026-04-20
criticalexploitedCVE-2023-2533: PaperCut NG/MF Cross-Site Request Forgery (CSRF) Vulnerabilitycisa-kev · 2025-07-28
criticalexploitedCVE-2023-27350: PaperCut MF/NG Improper Access Control Vulnerabilitycisa-kev · 2023-04-21