CVE-2026-39031

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Summary

CVECVE-2026-39031
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-26 21:16:33 UTC
Updated2026-06-29 19:27:07 UTC
DescriptionLansweeper 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from ADP

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS: 0.000890000 probability, percentile 0.005690000 (date 2026-06-30)

Problem Types: CWE-321 | n/a | CWE-321 CWE-321 Use of Hard-coded Cryptographic Key

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
usermode.net/cve/lansweeper_lsrunase2_lsencrypt2_cve.pdf 134c704f-9b21-4f2e-91b3-4a467353bcc0 usermode.net
github.com/user6400/cve-2026-39031-lansweeper-lsrunase2-lsencrypt2 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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