Vulnerability Description
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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/user6400/cve-2026-39031-lansweeper-lsrunase2-lsencrypt2
- https://usermode.net/cve/lansweeper_lsrunase2_lsencrypt2_cve.pdf
- https://github.com/user6400/cve-2026-39031-lansweeper-lsrunase2-lsencrypt2
- https://usermode.net/cve/lansweeper_lsrunase2_lsencrypt2_cve.pdf
FAQ
What is CVE-2026-39031?
CVE-2026-39031 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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. T...
How severe is CVE-2026-39031?
CVE-2026-39031 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-39031?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.