What’s Vulnerable › Vulnerabilities

CVE-2026-39031

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-26 · updated 2026-06-29
• Weakness: CWE-321

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://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

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