CVE-2026-39031
Lansweeper Credentials Decryption via Static Key and Cleartext Prefix
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.
INFO
Published Date :
June 26, 2026, midnight
Last Modified :
June 26, 2026, 8:43 p.m.
Remotely Exploit :
No
Source :
mitre
Affected Products
The following products are affected by CVE-2026-39031
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update Lansweeper to a version using stronger encryption.
- Implement secure key management practices.
- Avoid hardcoding sensitive encryption keys.
- Remove cleartext prefix from encrypted data.
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CVE-2026-39031 vulnerability anywhere in the article.