NCSC-2026-0334

Vulnerability from csaf_ncscnl - Published: 2026-08-28 12:31 - Updated: 2026-08-28 12:31
Summary
Kwetsbaarheden verholpen in PaperCut MF en PaperCut NG van PaperCut
Notes
The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions: NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein. NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory. This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings.
Feiten: PaperCut heeft kwetsbaarheden verholpen in PaperCut MF en PaperCut NG.
Interpretaties: Een ongeauthenticeerde kwaadwillende kan de kwetsbaarheden mogelijk achtereenvolgens misbruiken om een PaperCut-omgeving over te nemen en hierop willekeurige code uit te voeren. Hiertoe dient de kwaadwillende malafide netwerkverkeer naar de kwetsbare PaperCut-omgeving te sturen.
Oplossingen: PaperCut heeft updates uitgebracht om de kwetsbaarheden te verhelpen. Lees de securitybulletin van PaperCut voor meer informatie. Omdat de kwetsbaarheid al werd misbruikt voordat beveiligingsupdates beschikbaar waren, is het verstandig om je PaperCut-omgeving te controleren op aanwezigheid van de indicators-of-compromise (IOC's) die PaperCut in het securitybulletin heeft gedeeld. Het NCSC adviseert organisaties met PaperCut-omgevingen die vanaf het internet bereikbaar waren met klem om deze omgavingen op aanwezigheid van de IOC's te controleren.
Kans: medium
Schade: high
CWE-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')
CWE-306: Missing Authentication for Critical Function
CVE-2026-82078

PaperCut MF and PaperCut NG contain a vulnerability in their database connection utilities that permits unsafe dynamic class loading, allowing attackers with configuration access to execute arbitrary Java bytecode within the server's security context.

Affected products
Product Identifier Version Remediation
vers:unknown/*
PaperCut / PaperCut
 vers:unknown/*
CVE-2026-81578

An improper access control vulnerability in PaperCut MF and PaperCut NG's web management interface allows unauthenticated remote attackers to modify system configurations by executing backend actions prior to access validation.

Affected products
Product Identifier Version Remediation
vers:unknown/*
PaperCut / PaperCut
 vers:unknown/*
References
To clipboard 

{
  "document": {
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE"
      }
    },
    "lang": "nl",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions:\n\n    NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein.\n\n    NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory.\n    This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings."
      },
      {
        "category": "description",
        "text": "PaperCut heeft kwetsbaarheden verholpen in PaperCut MF en PaperCut NG.",
        "title": "Feiten"
      },
      {
        "category": "description",
        "text": "Een ongeauthenticeerde kwaadwillende kan de kwetsbaarheden mogelijk achtereenvolgens misbruiken om een PaperCut-omgeving over te nemen en hierop willekeurige code uit te voeren. Hiertoe dient de kwaadwillende malafide netwerkverkeer naar de kwetsbare PaperCut-omgeving te sturen.",
        "title": "Interpretaties"
      },
      {
        "category": "description",
        "text": "PaperCut heeft updates uitgebracht om de kwetsbaarheden te verhelpen. Lees de securitybulletin van PaperCut voor meer informatie.\n\nOmdat de kwetsbaarheid al werd misbruikt voordat beveiligingsupdates beschikbaar waren, is het verstandig om je PaperCut-omgeving te controleren op aanwezigheid van de indicators-of-compromise (IOC\u0027s) die PaperCut in het securitybulletin heeft gedeeld.\n\nHet NCSC adviseert organisaties met PaperCut-omgevingen die vanaf het internet bereikbaar waren met klem om deze omgavingen op aanwezigheid van de IOC\u0027s te controleren.",
        "title": "Oplossingen"
      },
      {
        "category": "general",
        "text": "medium",
        "title": "Kans"
      },
      {
        "category": "general",
        "text": "high",
        "title": "Schade"
      },
      {
        "category": "general",
        "text": "Use of Externally-Controlled Input to Select Classes or Code (\u0027Unsafe Reflection\u0027)",
        "title": "CWE-470"
      },
      {
        "category": "general",
        "text": "Missing Authentication for Critical Function",
        "title": "CWE-306"
      }
    ],
    "publisher": {
      "category": "coordinator",
      "contact_details": "cert@ncsc.nl",
      "name": "Nationaal Cyber Security Centrum",
      "namespace": "https://www.ncsc.nl/"
    },
    "references": [
      {
        "category": "external",
        "summary": "Reference",
        "url": "https://www.papercut.com/kb/Main/security-bulletin-27-aug-2026-urgent-security-advisory/"
      }
    ],
    "title": "Kwetsbaarheden verholpen in PaperCut MF en PaperCut NG van PaperCut",
    "tracking": {
      "current_release_date": "2026-08-28T12:31:14.173572Z",
      "generator": {
        "date": "2025-08-04T16:30:00Z",
        "engine": {
          "name": "V.A.",
          "version": "1.3"
        }
      },
      "id": "NCSC-2026-0334",
      "initial_release_date": "2026-08-28T12:31:14.173572Z",
      "revision_history": [
        {
          "date": "2026-08-28T12:31:14.173572Z",
          "number": "1.0.0",
          "summary": "Initiele versie"
        }
      ],
      "status": "final",
      "version": "1.0.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:unknown/*",
                "product": {
                  "name": "vers:unknown/*",
                  "product_id": "CSAFPID-1"
                }
              }
            ],
            "category": "product_name",
            "name": "PaperCut"
          }
        ],
        "category": "vendor",
        "name": "PaperCut"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-82078",
      "notes": [
        {
          "category": "description",
          "text": "PaperCut MF and PaperCut NG contain a vulnerability in their database connection utilities that permits unsafe dynamic class loading, allowing attackers with configuration access to execute arbitrary Java bytecode within the server\u0027s security context.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-82078 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-82078.json"
        }
      ],
      "title": "CVE-2026-82078"
    },
    {
      "cve": "CVE-2026-81578",
      "notes": [
        {
          "category": "description",
          "text": "An improper access control vulnerability in PaperCut MF and PaperCut NG\u0027s web management interface allows unauthenticated remote attackers to modify system configurations by executing backend actions prior to access validation.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-81578 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-81578.json"
        }
      ],
      "title": "CVE-2026-81578"
    }
  ]
}



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