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CVE-2026-81578

PaperCut MF/NG: Authentication Bypass

CVSS 4.0 8.8 HIGHCheck source for fixed versionsCISA KEV

Original advisory

cve-program · CVE-2026-81578

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-81578

Published

PaperCut MF/NG

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "PaperCut",
                    "product": "PaperCut MF/NG",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0",
                            "lessThan": "24.1.10",
                            "versionType": "semver"
                        },
                        {
                            "status": "affected",
                            "version": "25.0.0",
                            "lessThan": "25.0.13",
                            "versionType": "semver"
                        },
                        {
                            "status": "affected",
                            "version": "26.0.0",
                            "lessThan": "26.0.5",
                            "versionType": "semver"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON