CVE-2026-39031

Medium severity, CVSS 5.5. EPSS: 0.1% chance of exploitation in the next 30 days.

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.

Published 2026-06-26. Last modified 2026-06-29.