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.
History

Mon, 29 Jun 2026 20:45:00 +0000

Type Values Removed Values Added
First Time appeared Lansweeper
Lansweeper lsencrypt
Lansweeper lsrunase
Vendors & Products Lansweeper
Lansweeper lsencrypt
Lansweeper lsrunase

Mon, 29 Jun 2026 17:45:00 +0000

Type Values Removed Values Added
Title Lansweeper Credential Storage RC4 Key Exposure

Mon, 29 Jun 2026 16:15:00 +0000

Type Values Removed Values Added
Title Local Credential Disclosure via Hardcoded RC4 Key in Lansweeper lsrunase 2.0 and lsencrypt 2.0
Weaknesses CWE-327
CWE-330

Mon, 29 Jun 2026 14:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-321
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 26 Jun 2026 23:00:00 +0000

Type Values Removed Values Added
Title Local Credential Disclosure via Hardcoded RC4 Key in Lansweeper lsrunase 2.0 and lsencrypt 2.0
Weaknesses CWE-327
CWE-330

Fri, 26 Jun 2026 21:00:00 +0000

Type Values Removed Values Added
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

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2026-06-26T00:00:00.000Z

Updated: 2026-06-29T13:37:17.723Z

Reserved: 2026-04-06T00:00:00.000Z

Link: CVE-2026-39031

cve-icon Vulnrichment

Updated: 2026-06-29T13:35:05.929Z

cve-icon NVD

No data.

cve-icon Redhat

No data.