# CVE-2026-54617: launcher - Path Traversal

> Live exploitation tracking for CVE-2026-54617 by the CrowdSec Live Exploit Tracker, built from real-world attack data crowdsourced from CrowdSec's global network.

Page: https://tracker.crowdsec.net/cves/CVE-2026-54617

## Key facts

- **Exploitation phase:** Limited Exploitation. The vulnerability is known but shows very limited attacker interest or exploitation activity.
- **CVSS score:** 9.8
- **Public exploit available:** Yes
- **Affected products:** GravitLauncher launcher
- **Weaknesses:** CWE-22 (Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')); CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor); CWE-522 (Insufficiently Protected Credentials)
- **Tags:** web_server

## 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.

## CrowdSec analysis

[CVE-2026-54617](https://euvd.enisa.europa.eu/vulnerability/CVE-2026-54617) is a critical path traversal vulnerability in GravitLauncher versions prior to 5.7.12 that allows unauthenticated remote attackers to read files accessible to the LaunchServer process. Exposed signing keys, token material, or database credentials could enable forged administrative tokens and authentication bypass, potentially leading to full system compromise.

CrowdSec has been tracking this vulnerability and its exploits since 20th of October 2026.

CrowdSec has not observed any significant exploitation activity targeting CVE-2026-54617 across its network. As a result, no community-driven trend analysis is available for this vulnerability at this time.

Observed exploitation attempts send unauthenticated GET requests with a request target such as `../../.keys/ecdsa_id` to the LaunchServer file service, typically on port 9274. The missing leading slash enables path traversal outside the updates directory to read files accessible to the server process.

## Timeline

- 2026-09-17: CVE Published. CVE-2026-54617 is published to NVD.
- 2026-10-20: Rule Released. CrowdSec releases a rule to detect CVE-2026-54617 exploitation attempts against the CrowdSec Network.
- 2026-10-21: First exploitation attempt seen by CrowdSec

## References

- https://github.com/GravitLauncher/Launcher/security/advisories/GHSA-5g75-477j-2c2f
- https://github.com/GravitLauncher/Launcher/releases/tag/v5.7.12
- https://github.com/GravitLauncher/Launcher/commit/8114a1d4cfbcaab4c1c337d921597805d71dee3b
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-54617.yaml

## Live exploitation data

The [Live Exploit Tracker page](https://tracker.crowdsec.net/cves/CVE-2026-54617) follows observed exploitation activity for CVE-2026-54617. [Request an API key](https://tracker.crowdsec.net/request-api-key) for full access to its exploitation timeline, attacking IP addresses and blocklists.