Summary
generated automatically from NVD dataPaperCut MF and PaperCut NG contain an improper access control flaw (CWE-305) in their web management interface. Under certain conditions, unauthenticated remote requests aimed at administrative functions trigger backend actions before access validation finishes, letting an attacker modify certain system configurations. The flaw is rated CRITICAL with a CVSS v3.1 score of 9.8 and is listed in the CISA KEV catalog, indicating active exploitation.
NVD description
An improper access control vulnerability exists in the web management interface of PaperCut MF and PaperCut NG. Under specific conditions, unauthenticated remote requests targeting administrative functions can trigger backend actions prior to the completion of access validation checks. This allows an unauthenticated remote attacker to modify certain system configurations.
⚠️ Actively exploited — CISA KEV
This CVE was added to CISA's Known Exploited Vulnerabilities catalog on 2026-08-31. It is confirmed exploited in the wild and must be patched as a priority.
Remediation deadline (US federal agencies): 2026-09-14
EPSS · FIRST.org
85.6%probability of exploitation in the next 30 days
Higher than 99% of scored CVEs
EPSS (Exploit Prediction Scoring System) estimates, from observed exploitation activity, how likely a CVE is to be exploited in the next 30 days. It complements CVSS, which measures severity, not likelihood. Score of 2026-10-16, recomputed daily by FIRST.org.
In-depth analysis on cveo.tech
We've published a detailed analysis of this CVE — exploitation, IOCs and mitigation.
CVSS v3.1 Score
Information
- Published
- 28 août 2026
- Updated
- 14 sept. 2026
- Status
- Analyzed
- Source
- eb41dac7-0af8-4f84-9f6d-0272772514f4
Affected products
Weaknesses (CWE)
References (3)
- https://github.com/rapid7/metasploit-framework/pull/21842Issue TrackingPatch
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-81578PatchThird Party AdvisoryUS Government Resource
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