Detections
Analytics
CVE-2026-39031
medium
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.
References
https://usermode.net/cve/lansweeper_lsrunase2_lsencrypt2_cve.pdf
https://github.com/user6400/cve-2026-39031-lansweeper-lsrunase2-lsencrypt2