{"id":"CVE-2026-81578","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-81578","generatedAt":"2026-10-31T03:54:44.804Z","title":"PaperCut NG/MF Missing Authentication for Critical Function Vulnerability","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.","published":"2026-08-28T16:18:30.000Z","lastModified":"2026-09-14T00:16:56.000Z","status":"Analyzed","sourceIdentifier":"eb41dac7-0af8-4f84-9f6d-0272772514f4","cvss":{"version":"4.0","score":8.8,"severity":"HIGH","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-305"],"affected":["papercut/papercut mf","papercut/papercut ng"],"epss":{"score":0.84734,"percentile":0.99707,"date":"2026-10-30","history":[{"date":"2026-09-24","score":0.04481,"percentile":0.91096},{"date":"2026-09-30","score":0.85169,"percentile":0.99709},{"date":"2026-10-25","score":0.83729,"percentile":0.99685},{"date":"2026-10-30","score":0.84734,"percentile":0.99707}]},"kev":{"listed":true,"dateAdded":"2026-08-31","dueDate":"2026-09-14","knownRansomwareCampaignUse":"Unknown","notes":"Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.\nhttps://www.papercut.com/kb/Main/security-bulletin-27-aug-2026-urgent-security-advisory/ ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-81578"},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"Known to be exploited in the wild (CISA KEV, CISA remediation deadline 14 September 2026). Treat as an emergency change: patch or isolate now, then hunt for prior compromise."},"changes":[{"kind":"epss","label":"EPSS jump","at":"2026-09-30T00:00:00.000Z","detail":{"to":0.85169,"from":0.04481,"percentile":0.99709},"summary":"EPSS moved from 4.5% to 85.2% probability of exploitation in the next thirty days."}],"references":[{"url":"https://www.papercut.com/kb/Main/security-bulletin-27-aug-2026-urgent-security-advisory/","tags":["Patch","Vendor Advisory"],"source":"eb41dac7-0af8-4f84-9f6d-0272772514f4"},{"url":"https://github.com/rapid7/metasploit-framework/pull/21842","tags":["Issue Tracking","Patch"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-81578","tags":["Patch","Third Party Advisory","US Government Resource"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-81578","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}