CVE-2026-39031

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-06-26. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
41(Track)
EG Risk 41/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity55% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
0%
KEV
Not listed

Published

June 26, 2026

Last Modified

June 29, 2026

Advisory Details (1)

Auto-updated Jun 29, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

GitHub - user6400/cve-2026-39031-lansweeper-lsrunase2-lsencrypt2: CVE-2026-39031 — offline plaintext password recovery for Lansweeper lsrunase 2.0 / lsencrypt 2.0 via a hardcoded RC4 key. PoC + technical advisory. · GitHub

https://github.com/user6400/cve-2026-39031-lansweeper-lsrunase2-lsencrypt2

Vendor Advisories for CVE-2026-39031(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 139 total refreshes for this CVE.

  1. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-11 09:37 UTCEPSS rescore
  3. 2026-09-10 09:34 UTCEPSS rescore
  4. 2026-09-08 22:00 UTCEPSS rescore
  5. 2026-09-07 16:01 UTCEPSS rescore
  6. 2026-09-06 14:51 UTCEG score recompute
  7. 2026-09-06 14:51 UTCGHSA enrichment
  8. 2026-09-04 05:06 UTCEPSS rescore
  9. 2026-09-01 13:53 UTCEPSS rescore
  10. 2026-08-30 19:17 UTCEPSS rescore
  11. 2026-08-30 19:14 UTCGHSA enrichment
  12. 2026-08-27 22:53 UTCEG score recompute
  13. 2026-08-27 22:53 UTCGHSA enrichment
  14. 2026-08-27 14:25 UTCEPSS rescore
  15. 2026-08-26 14:46 UTCEPSS rescore
  16. 2026-08-25 13:49 UTCEPSS rescore
  17. 2026-08-24 14:23 UTCEG score recompute
  18. 2026-08-24 14:23 UTCGHSA enrichment
  19. 2026-08-23 12:25 UTCEG score recompute
  20. 2026-08-23 12:25 UTCGHSA enrichment
  21. 2026-08-23 00:19 UTCEPSS rescore
  22. 2026-08-22 10:28 UTCEG score recompute
  23. 2026-08-22 10:28 UTCGHSA enrichment
  24. 2026-08-21 23:49 UTCEPSS rescore
  25. 2026-08-21 08:30 UTCEG score recompute
Show 75 more
  1. 2026-08-21 08:30 UTCGHSA enrichment
  2. 2026-08-20 22:55 UTCEPSS rescore
  3. 2026-08-20 06:32 UTCEG score recompute
  4. 2026-08-20 06:32 UTCGHSA enrichment
  5. 2026-08-19 17:03 UTCEPSS rescore
  6. 2026-08-18 23:30 UTCGHSA enrichment
  7. 2026-08-17 14:31 UTCEG score recompute
  8. 2026-08-17 14:31 UTCGHSA enrichment
  9. 2026-08-17 13:47 UTCEPSS rescore
  10. 2026-08-16 14:56 UTCEPSS rescore
  11. 2026-08-16 12:33 UTCEG score recompute
  12. 2026-08-16 12:33 UTCGHSA enrichment
  13. 2026-08-16 02:14 UTCEPSS rescore
  14. 2026-08-15 10:35 UTCEG score recompute
  15. 2026-08-15 10:35 UTCGHSA enrichment
  16. 2026-08-15 01:30 UTCEPSS rescore
  17. 2026-08-14 08:37 UTCEG score recompute
  18. 2026-08-14 08:37 UTCGHSA enrichment
  19. 2026-08-13 22:00 UTCEPSS rescore
  20. 2026-08-13 06:39 UTCEG score recompute
  21. 2026-08-13 06:39 UTCGHSA enrichment
  22. 2026-08-12 13:51 UTCEPSS rescore
  23. 2026-08-12 04:42 UTCEG score recompute
  24. 2026-08-12 04:42 UTCGHSA enrichment
  25. 2026-08-11 13:43 UTCEPSS rescore
  26. 2026-08-11 02:37 UTCEG score recompute
  27. 2026-08-11 02:37 UTCGHSA enrichment
  28. 2026-08-11 00:00 UTCEPSS rescore
  29. 2026-08-10 00:39 UTCEG score recompute
  30. 2026-08-10 00:39 UTCGHSA enrichment
  31. 2026-08-09 13:46 UTCEPSS rescore
  32. 2026-08-08 22:42 UTCEG score recompute
  33. 2026-08-08 22:42 UTCGHSA enrichment
  34. 2026-08-08 16:37 UTCEPSS rescore
  35. 2026-08-07 20:44 UTCGHSA enrichment
  36. 2026-08-06 18:47 UTCEG score recompute
  37. 2026-08-06 18:47 UTCGHSA enrichment
  38. 2026-08-06 13:46 UTCEPSS rescore
  39. 2026-08-05 19:17 UTCEPSS rescore
  40. 2026-08-05 16:50 UTCEG score recompute
  41. 2026-08-05 16:50 UTCGHSA enrichment
  42. 2026-08-04 15:10 UTCEPSS rescore
  43. 2026-08-04 14:52 UTCEG score recompute
  44. 2026-08-04 14:52 UTCGHSA enrichment
  45. 2026-08-04 10:38 UTCEPSS rescore
  46. 2026-08-03 10:36 UTCEPSS rescore
  47. 2026-08-03 08:30 UTCGHSA enrichment
  48. 2026-08-02 06:22 UTCEG score recompute
  49. 2026-08-02 06:22 UTCGHSA enrichment
  50. 2026-08-02 02:27 UTCEPSS rescore
  51. 2026-08-01 04:16 UTCEPSS rescore
  52. 2026-08-01 04:09 UTCGHSA enrichment
  53. 2026-07-31 02:09 UTCEG score recompute
  54. 2026-07-31 02:09 UTCGHSA enrichment
  55. 2026-07-30 16:28 UTCEPSS rescore
  56. 2026-07-30 01:30 UTCEPSS rescore
  57. 2026-07-30 00:11 UTCGHSA enrichment
  58. 2026-07-28 20:05 UTCEG score recompute
  59. 2026-07-28 20:04 UTCGHSA enrichment
  60. 2026-07-27 17:04 UTCEG score recompute
  61. 2026-07-27 17:04 UTCGHSA enrichment
  62. 2026-07-27 14:13 UTCEPSS rescore
  63. 2026-07-26 14:29 UTCEG score recompute
  64. 2026-07-26 14:29 UTCGHSA enrichment
  65. 2026-07-25 14:18 UTCEPSS rescore
  66. 2026-07-25 14:18 UTCEPSS rescore
  67. 2026-07-24 14:17 UTCEPSS rescore
  68. 2026-07-24 14:17 UTCEPSS rescore
  69. 2026-07-23 14:18 UTCEPSS rescore
  70. 2026-07-23 14:18 UTCEPSS rescore
  71. 2026-07-23 03:10 UTCEG score recompute
  72. 2026-07-22 14:08 UTCEPSS rescore
  73. 2026-07-21 15:24 UTCEPSS rescore
  74. 2026-07-20 17:08 UTCEPSS rescore
  75. 2026-07-18 10:04 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-39031?
CVE-2026-39031 is a medium vulnerability published on June 26, 2026. 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…
When was CVE-2026-39031 disclosed?
CVE-2026-39031 was first published in the National Vulnerability Database on June 26, 2026, with the most recent update on June 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-39031 actively exploited?
CVE-2026-39031 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 99.5% of all scored CVEs.
What is the CVSS score of CVE-2026-39031?
CVE-2026-39031 has a CVSS v3.1 base score of 5.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-39031?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-39031, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-39031

Explore →

Is Your Infrastructure Affected by CVE-2026-39031?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs