FKIE_CVE-2026-39031

Vulnerability from fkie_nvd - Published: 2026-06-26 21:16 - Updated: 2026-06-29 19:27
Severity
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Summary
Lansweeper lsrunase 2.0 and lsencrypt 2.0 use RC4 encryption with a hardcoded 142-byte static key array to encrypt credentials. An 8-character prefix is stored in cleartext alongside the ciphertext. This allows an attacker with local access to recover any encrypted password to plaintext using a single SHA-1 hash and RC4 decryption operation, with no brute force required.
References
cve@mitre.orghttps://github.com/user6400/cve-2026-39031-lansweeper-lsrunase2-lsencrypt2
cve@mitre.orghttps://usermode.net/cve/lansweeper_lsrunase2_lsencrypt2_cve.pdf
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/user6400/cve-2026-39031-lansweeper-lsrunase2-lsencrypt2
134c704f-9b21-4f2e-91b3-4a467353bcc0https://usermode.net/cve/lansweeper_lsrunase2_lsencrypt2_cve.pdf
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Lansweeper lsrunase 2.0 and lsencrypt 2.0 use RC4 encryption with a hardcoded 142-byte static key array to encrypt credentials. An 8-character prefix is stored in cleartext alongside the ciphertext. This allows an attacker with local access to recover any encrypted password to plaintext using a single SHA-1 hash and RC4 decryption operation, with no brute force required."
    }
  ],
  "id": "CVE-2026-39031",
  "lastModified": "2026-06-29T19:27:07.477",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "NONE",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-39031",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-06-29T13:37:09.839096Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-06-26T21:16:33.600",
  "references": [
    {
      "source": "cve@mitre.org",
      "url": "https://github.com/user6400/cve-2026-39031-lansweeper-lsrunase2-lsencrypt2"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://usermode.net/cve/lansweeper_lsrunase2_lsencrypt2_cve.pdf"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/user6400/cve-2026-39031-lansweeper-lsrunase2-lsencrypt2"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://usermode.net/cve/lansweeper_lsrunase2_lsencrypt2_cve.pdf"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-321"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}



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