{"id":"CVE-2026-81578","title":"An improper access control vulnerability exists in the web management interface of PaperCut MF and PaperCut NG","summary":"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 pri…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-305"],"vendor":"papercut","product":"papercut_mf","affected":["papercut_mf < 24.1.9","papercut_mf >= 25.0.2, < 25.0.12","papercut_mf >= 26.0.2, < 26.0.4","papercut_ng < 24.1.9","papercut_ng >= 25.0.2, < 25.0.12","papercut_ng >= 26.0.2, < 26.0.4"],"patched":["papercut_mf 26.0.4","papercut_ng 26.0.4"],"published":"2026-08-28","updated":"2026-09-14","sourceUpdated":"2026-09-14T00:16:56.207","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-81578","references":[{"url":"https://www.papercut.com/kb/Main/security-bulletin-27-aug-2026-urgent-security-advisory/","label":"eb41dac7-0af8-4f84-9f6d-0272772514f4"},{"url":"https://github.com/rapid7/metasploit-framework/pull/21842","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-81578","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","in-the-wild","exploit-available","kev"],"exploited":true,"exploitAvailable":true,"ssvc":{"exploitation":"active","automatable":"yes","technicalImpact":"partial","timestamp":"2026-08-28T00:00:00+00:00"},"scores":{"nvd":9.8,"cna":8.8},"ingestedAt":"2026-09-14T15:24:01.305Z","epss":0.0329,"epssPercentile":0.87936,"kev":true,"kevDateAdded":"2026-08-31","kevDueDate":"2026-09-14","kevRansomware":false,"exploits":{"github":2,"githubRepos":["https://github.com/yora1928/PaperCut-CVE-2026-81578-82078","https://github.com/virologi-info/papercut-toolkit"],"metasploit":["exploit/multi/http/papercut_ng_external_user_lookup_rce"],"nuclei":["CVE-2026-81578"],"checkedAt":"2026-09-23T07:14:55.866Z"},"slug":"CVE-2026-81578","body":"## Overview\n\nAn 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.\n\n## Affected\n\n- `papercut_mf < 24.1.9`\n- `papercut_mf >= 25.0.2, < 25.0.12`\n- `papercut_mf >= 26.0.2, < 26.0.4`\n- `papercut_ng < 24.1.9`\n- `papercut_ng >= 25.0.2, < 25.0.12`\n- `papercut_ng >= 26.0.2, < 26.0.4`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `papercut_mf 26.0.4`\n- `papercut_ng 26.0.4`","depth":"hadal","depthScore":80,"depthScoreParts":{"impact":53.9,"likelihood":0.7,"exploitation":25,"ransomware":0},"changes":[]}