FKIE_CVE-2026-81578

Vulnerability from fkie_nvd - Published: 2026-08-28 16:18 - Updated: 2026-09-01 04:18
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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 prior to the completion of access validation checks. This allows an unauthenticated remote attacker to modify certain system configurations.
References
eb41dac7-0af8-4f84-9f6d-0272772514f4https://www.papercut.com/kb/Main/security-bulletin-27-aug-2026-urgent-security-advisory/Patch, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/rapid7/metasploit-framework/pull/21842Issue Tracking, Patch
134c704f-9b21-4f2e-91b3-4a467353bcc0https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-81578Patch, Third Party Advisory, US Government Resource
Impacted products
Vendor Product Version
papercut papercut_mf *
papercut papercut_mf *
papercut papercut_mf *
papercut papercut_ng *
papercut papercut_ng *
papercut papercut_ng *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "PaperCut MF/NG",
          "vendor": "PaperCut",
          "versions": [
            {
              "lessThan": "24.1.10, 25.0.13, 26.0.5",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "eb41dac7-0af8-4f84-9f6d-0272772514f4"
    }
  ],
  "cisaActionDue": "2026-09-14",
  "cisaExploitAdd": "2026-08-31",
  "cisaRequiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA\u2019s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA\u2019s \u201cForensics Triage Requirements\u201d (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\u0027s internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
  "cisaVulnerabilityName": "PaperCut NG/MF Missing Authentication for Critical Function Vulnerability",
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:papercut:papercut_mf:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "F2AF3AB4-FD10-4DE1-B906-011F45948BD0",
              "versionEndExcluding": "24.1.9",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:papercut:papercut_mf:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "8F6ED0B8-62DC-4CF9-9810-2CCB824FBCA8",
              "versionEndExcluding": "25.0.12",
              "versionStartIncluding": "25.0.2",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:papercut:papercut_mf:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "51E91B81-E311-4BB9-A753-671F0C59E7F7",
              "versionEndExcluding": "26.0.4",
              "versionStartIncluding": "26.0.2",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:papercut:papercut_ng:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "44FCDCDE-4126-4F4F-89FC-D44924F45C82",
              "versionEndExcluding": "24.1.9",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:papercut:papercut_ng:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "9E727ABD-0007-424D-AB07-FB7816E43792",
              "versionEndExcluding": "25.0.12",
              "versionStartIncluding": "25.0.2",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:papercut:papercut_ng:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "3938B71A-CB14-4017-A037-7D5F08DAFB13",
              "versionEndExcluding": "26.0.4",
              "versionStartIncluding": "26.0.2",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An improper access control vulnerability exists in the web management interface of PaperCut MF and PaperCut NG. Under specific\u00a0conditions, 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."
    }
  ],
  "id": "CVE-2026-81578",
  "lastModified": "2026-09-01T04:18:01.990",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "LOW",
          "vulnConfidentialityImpact": "LOW",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "eb41dac7-0af8-4f84-9f6d-0272772514f4",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-81578",
          "options": [
            {
              "exploitation": "active"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-28T00:00:00+00:00",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-28T16:18:29.600",
  "references": [
    {
      "source": "eb41dac7-0af8-4f84-9f6d-0272772514f4",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://www.papercut.com/kb/Main/security-bulletin-27-aug-2026-urgent-security-advisory/"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "url": "https://github.com/rapid7/metasploit-framework/pull/21842"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Patch",
        "Third Party Advisory",
        "US Government Resource"
      ],
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-81578"
    }
  ],
  "sourceIdentifier": "eb41dac7-0af8-4f84-9f6d-0272772514f4",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-305"
        }
      ],
      "source": "eb41dac7-0af8-4f84-9f6d-0272772514f4",
      "type": "Secondary"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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