CVE-2026-39031 Hardcoded credentials in n/a
Local attackers can recover encrypted credentials to plaintext due to hardcoded RC4 keys in Lansweeper utilities, compromising stored secrets.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-39031?
CVE-2026-39031 is a medium-severity vulnerability in n/a, published on 26 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-321
Which versions are affected by CVE-2026-39031?
How do I fix CVE-2026-39031?
No fix has been published for CVE-2026-39031 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-39031 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-39031 exists.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-22h8-g6qj-g2g4.