> CVE-2026-39386 [HIGH]

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PUBLISHED
2026-04-21 01:16
MODIFIED
2026-04-21 01:16
CVSS_SCORE V3
8.8
EPSS (Prob. Exploit)
0.44%
Top 61.8%
DATA SOURCES:
NVD đź”— 2026-04-21 CWE MITRE đź”— 2026-11-01 FIRST EPSS đź”— 2026-11-08 GITHUB đź”— 2026-11-05 OSV đź”— 2026-11-02

> DESCRIPTION

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.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EXPLOITABILITY
2.8
IMPACT
5.9

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
Low (L)
Authentifié avec compte utilisateur basique
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
High (H)
Divulgation totale d'informations
I (Impact Intégrité)
Integrity Impact
High (H)
Modification totale des données possible
A (Impact Disponibilité)
Availability Impact
High (H)
Interruption totale du service possible

> RÉSUMÉ DES IMPACTS

Confidentialité
High
Divulgation totale d'informations
Intégrité
High
Modification totale des données possible
Disponibilité
High
Interruption totale du service possible

> WEAKNESSES

CWE-20 CWE-269 CWE-284 CWE-639 CWE-862

> CWE DETAILED DESCRIPTIONS

CWE-20: Improper Input Validation - The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. | CWE-269: Improper Privilege Management - The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. | CWE-284: Improper Access Control - The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. | CWE-639: Authorization Bypass Through User-Controlled Key - The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. | CWE-862: Missing Authorization - The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

> GITHUB SECURITY ADVISORY

GHSA-2gw9-c2r2-f5qf HIGH

Neko has a Self-service Privilege Escalation for Authenticated Users

AFFECTED PACKAGES:
GO / github.com/m1k1o/neko/server
>= 0.0.0-20250322225643-212bf8a60756, < 0.0.0-20260406184107-c54bcf1ee211
Fixed in: 0.0.0-20260406184107-c54bcf1ee211
GO / github.com/m1k1o/neko/server
>= 3.0.0, < 3.0.11
Fixed in: 3.0.11

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

Neko has Self-service Privilege Escalation for Authenticated Users

AFFECTED PACKAGES:
Unknown / Unknown
13 versions affected
ALIASES:
GHSA-2gw9-c2r2-f5qf, GO-2026-4960

> HISTORIQUE DES MODIFICATIONS

Première apparition
21/04/2026 01:16
Source: NVD
đź“Š ENRICHISSEMENT 01/05/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-20: Improper Input Validation - The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process...
Total des modifications: 1 Dernière mise à jour: 6 months ago

> REFERENCES

https://github.com/m1k1o/neko/releases/tag/v3.0.11
https://github.com/m1k1o/neko/releases/tag/v3.1.2
https://github.com/m1k1o/neko/security/advisories/GHSA-2gw9-c2r2-f5qf
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