> CVE-2026-54617 [CRITICAL]

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PUBLISHED
2026-09-17 19:16
MODIFIED
2026-09-17 19:16
CVSS_SCORE V3
9.8
EPSS (Prob. Exploit)
2.88%
Top 13.4%
🎯 NUCLEI TEMPLATE
DATA SOURCES:
NVD 🔗 2026-09-17 CWE MITRE 🔗 2026-10-01 FIRST EPSS 🔗 2026-10-17 GITHUB 🔗 2026-10-15 OSV 🔗 2026-09-24 NUCLEI 🔗 2026-10-18

> DESCRIPTION

GravitLauncher is an open-source Minecraft launcher based on sashok724's v3. Prior to 5.7.12, an unauthenticated remote actor can send a raw HTTP request target without a leading slash to the default LaunchServer file server on port 9274. FileServerHandler.channelRead0 in components/launchserver/src/main/java/pro/gravit/launchserver/socket/handlers/fileserver/FileServerHandler.java strips the first request-target character and resolves the remaining path against updatesDir without re-normalizing and verifying containment. This leaves parent-directory components in a no-leading-slash request and allows reading any file accessible to the LaunchServer process, including .keys/ecdsa_id, .keys/legacySalt, and LaunchServer.json. Disclosure of those files can expose signing keys, refresh-token material, and database credentials, enabling forged administrative access tokens and full authentication bypass. A normalizing L7 proxy may block the primary request form, but direct exposure and L4/TCP proxies remain affected, and netty.fileServerEnabled is enabled by default. This issue is fixed in 5.7.12.

> 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:N/UI:N/S:U/C:H/I:H/A:H
EXPLOITABILITY
3.9
IMPACT
5.9

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:L/PR:N/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
None (N)
Aucune authentification requise
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-22 CWE-200 CWE-522

> CWE DETAILED DESCRIPTIONS

CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') - The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. | CWE-200: Exposure of Sensitive Information to an Unauthorized Actor - The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. | CWE-522: Insufficiently Protected Credentials - The product transmits or stores authentication credentials, but it uses an insecure method that is susceptible to unauthorized interception and/or retrieval.

> GITHUB SECURITY ADVISORY

GHSA-5g75-477j-2c2f CRITICAL

LaunchServer FileServerHandler has an unauthenticated path traversal issue

AFFECTED PACKAGES:
MAVEN / pro.gravit.launcher:launchserver-api
<= 5.7.11

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

GravitLauncher: Unauthenticated path traversal in LaunchServer FileServerHandler

AFFECTED PACKAGES:
Unknown / Unknown
16 versions affected
ALIASES:
GHSA-5g75-477j-2c2f

> NUCLEI TEMPLATES

Des templates Nuclei sont disponibles pour scanner cette vulnérabilité.

🎯
CVE-2026-54617.yaml
http/cves/2026/CVE-2026-54617.yaml
Usage: nuclei -t http/cves/2026/CVE-2026-54617.yaml -u target.com

> HISTORIQUE DES MODIFICATIONS

Première apparition
17/09/2026 19:16
Source: NVD
📊 ENRICHISSEMENT 01/10/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') - The product uses external input to construct a pathname that is intended to identify a file or directory that i...
Total des modifications: 1 Dernière mise à jour: 3 weeks ago

> REFERENCES

https://github.com/GravitLauncher/Launcher/commit/8114a1d4cfbcaab4c1c337d9215978...
https://github.com/GravitLauncher/Launcher/releases/tag/v5.7.12
https://github.com/GravitLauncher/Launcher/security/advisories/GHSA-5g75-477j-2c...
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