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CVE-2026-81578 is a vulnerability classified as Authentication Bypass by Primary Weakness, affecting PaperCut MF/NG (affected versions: < 24.1.10, 25.0.13, 26.0.5). This vulnerability is rated High, with a CVSS score of 8.8. This vulnerability has been observed being exploited in the wild.
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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.
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