CVE-2026-39386

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 84% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.8Exploit: NoneExposed: 0

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

Neko is a a self-hosted virtual browser that runs in Docker and uses WebRTC In versions 3.0.0 through 3.0.10 and 3.1.0 through 3.1.1, any authenticated user can immediately obtain full administrative control of the entire Neko instance (member management, room settings, broadcast control, session termination, etc.). This results in a complete compromise of the instance. The vulnerability has been patched in v3.0.11 and v3.1.2. If upgrading is not immediately possible, the following mitigations can reduce risk: Restrict access to trusted users only (avoid granting accounts to untrusted parties); ensure all user passwords are strong and only shared with trusted individuals; run the instance only when needed; avoid leaving it continuously exposed; place the instance behind authentication layers such as a reverse proxy with additional access controls; disable or restrict access to the /api/profile endpoint if feasible; and/or monitor for suspicious privilege changes or unexpected administrative actions. Note that these are temporary mitigations and do not fully eliminate the vulnerability. Upgrading is strongly recommended.

CVSS v3
8.8
EG Score
8.8(medium)
EPSS
35.5%
KEV
Not listed

Published

April 21, 2026

Last Modified

April 23, 2026

Advisory Details (3)

Auto-updated May 2, 2026
Patch available. Sources: github.
github Patch Available

Self-service Privilege Escalation for Authenticated Users · Advisory · m1k1o/neko · GitHub

https://github.com/m1k1o/neko/security/advisories/GHSA-2gw9-c2r2-f5qf
generic

Release v3.1.2 · m1k1o/neko · GitHub

https://github.com/m1k1o/neko/releases/tag/v3.1.2
generic

Release v3.0.11 · m1k1o/neko · GitHub

https://github.com/m1k1o/neko/releases/tag/v3.0.11

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/m1k1o/neko/server—0.0.0-20260406184107-c54bcf1ee211—

Weakness Classification(5)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 35× 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.

  1. 2026-07-21 15:24 UTCEPSS rescore
  2. 2026-07-20 17:08 UTCEPSS rescore
  3. 2026-07-20 07:02 UTCOSV refresh
  4. 2026-07-19 02:29 UTCEPSS rescore
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  6. 2026-07-16 17:03 UTCEPSS rescore
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  15. 2026-07-09 19:10 UTCEPSS rescore
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  17. 2026-07-07 13:46 UTCEPSS rescore
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  20. 2026-07-06 02:23 UTCEPSS rescore
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  1. 2026-06-29 14:06 UTCEPSS rescore
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  3. 2026-06-28 04:56 UTCEPSS rescore
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  5. 2026-06-25 13:49 UTCEPSS rescore
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  8. 2026-06-23 21:33 UTCEPSS rescore
  9. 2026-06-22 14:25 UTCEPSS rescore
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  11. 2026-06-21 14:56 UTCEPSS rescore
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  13. 2026-06-21 01:59 UTCEPSS rescore
  14. 2026-06-19 19:25 UTCEPSS rescore
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  16. 2026-06-18 17:52 UTCEPSS rescore
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  18. 2026-06-17 17:53 UTCEPSS rescore
  19. 2026-06-16 17:52 UTCEPSS rescore
  20. 2026-06-15 17:49 UTCEPSS rescore
  21. 2026-06-14 23:18 UTCEPSS rescore
  22. 2026-06-13 23:00 UTCEPSS rescore
  23. 2026-06-12 23:12 UTCEPSS rescore
  24. 2026-06-12 23:12 UTCEPSS rescore
  25. 2026-06-11 14:00 UTCEPSS rescore
  26. 2026-06-10 22:18 UTCEPSS rescore
  27. 2026-06-10 13:22 UTCEPSS rescore
  28. 2026-06-08 14:17 UTCEPSS rescore
  29. 2026-06-08 14:17 UTCEPSS rescore
  30. 2026-06-07 15:25 UTCEPSS rescore
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  35. 2026-06-05 22:47 UTCEPSS rescore
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  39. 2026-06-04 13:12 UTCEPSS rescore
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  41. 2026-06-02 20:13 UTCEPSS rescore
  42. 2026-06-01 13:52 UTCEPSS rescore
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  45. 2026-05-31 22:30 UTCEPSS rescore
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  47. 2026-05-31 00:16 UTCEPSS rescore
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  50. 2026-05-29 13:44 UTCEPSS rescore
  51. 2026-05-29 13:44 UTCEPSS rescore
  52. 2026-05-28 13:44 UTCEPSS rescore
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  55. 2026-05-27 13:40 UTCEPSS rescore
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  58. 2026-05-26 13:44 UTCEPSS rescore
  59. 2026-05-26 07:18 UTCEPSS rescore
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  61. 2026-05-20 22:38 UTCEPSS rescore
  62. 2026-05-20 22:38 UTCEPSS rescore
  63. 2026-05-20 16:37 UTCEG score recompute
  64. 2026-05-20 11:22 UTCEPSS rescore
  65. 2026-05-20 11:22 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-39386?
CVE-2026-39386 is a high vulnerability published on April 21, 2026. Neko is a a self-hosted virtual browser that runs in Docker and uses WebRTC In versions 3.0.0 through 3.0.10 and 3.1.0 through 3.1.1, any authenticated user can immediately obtain full administrative control of the entire Neko instance (member management, room settings, broadcast control, session…
When was CVE-2026-39386 disclosed?
CVE-2026-39386 was first published in the National Vulnerability Database on April 21, 2026, with the most recent update on April 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-39386 actively exploited?
CVE-2026-39386 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 35.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-39386?
CVE-2026-39386 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-39386?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-39386, 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.

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