What is CVE-2026-39031?

CVE-2026-39031 is a medium-severity vulnerability in N/a, classified under Use of Hard-coded Cryptographic Key. CVSS score: 5.5/10. Published 2026-06-26.

How severe is CVE-2026-39031?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Is CVE-2026-39031 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in N/a

CVE-2026-39031

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 acces…

EPSS: 0.001 (1.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

Affected products

N/a — versions n/a

Weakness classification (CWE)

CWE-321 — Use of Hard-coded Cryptographic Key

Public proof-of-concept exploits

user6400/cve-2026-39031-lansweeper-lsrunase2-lsencrypt2

References

Frequently asked questions

What is CVE-2026-39031?: CVE-2026-39031 is a medium-severity vulnerability in N/a, classified under Use of Hard-coded Cryptographic Key. CVSS score: 5.5/10. Published 2026-06-26.
How severe is CVE-2026-39031?: Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2026-39031 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.