{"answers":{"affected":"2 open source packages ship an affected version, including pro.gravit.launcher:launchserver-api.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-54617 exists.","fix":"No fix has been published for CVE-2026-54617 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-54617 is a critical path traversal vulnerability in GravitLauncher Launcher, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-54617 and fix it if it is affected.\n\nWhat it is: CVE-2026-54617 is a critical path traversal vulnerability in GravitLauncher Launcher, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-54617 exists.\n\nAffected packages and fixed versions:\n- pro.gravit.launcher:launchserver-api (Maven): affected all versions up to 5.7.11; no fix listed\n- pro.gravit.launcher:launchserver-api (Maven): affected all versions up to 5.7.11; no fix listed\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-54617/ (Markdown: https://insights.sbomify.com/CVE-2026-54617/index.md)","id":"CVE-2026-54617","markdown":"https://insights.sbomify.com/CVE-2026-54617/index.md","name":"CVE-2026-54617","record":{"aliases":["GHSA-5g75-477j-2c2f"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["data_read","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Minecraft launcher server","requires_auth":"none","summary":"Unauthenticated attackers can read sensitive files via path traversal, exposing keys and credentials to enable authentication bypass.","user_interaction":"not_required","vuln_class":"path_traversal"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":9.8,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-522","name":"Insufficiently Protected Credentials"},{"id":"CWE-22","name":"Improper Limitation of a Pathname to a Restricted Directory"},{"id":"CWE-200","name":"Exposure of Sensitive Information to an Unauthorized Actor"}],"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.","ecosystems":["Maven"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":1,"refs":[{"date":null,"kind":"nuclei","ref":"http/cves/2026/CVE-2026-54617.yaml","stars":null,"title":"GravitLauncher LaunchServer \u003c=5.7.11 - Unauthenticated Path Traversal to Arbitrary File Read"}],"tier":"weaponised"},"has_fix":false,"headline":"GravitLauncher: Unauthenticated path traversal in LaunchServer FileServerHandler","id":"CVE-2026-54617","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":null,"products":[],"type":"path_traversal","year":"2026"},"n_packages":2,"n_references":3,"next":{"headline":"Obsidian Web MCP: Unauthenticated vault access: /oauth/authorize auto-approves without authenticating the user","id":"CVE-2026-54618"},"packages":[{"ecosystem":"Maven","fixed":[],"introduced":["0"],"last_affected":["5.7.11"],"package":"pro.gravit.launcher:launchserver-api","purl":null,"source":"GHSA-5g75-477j-2c2f"},{"ecosystem":"Maven","fixed":[],"introduced":["0"],"last_affected":["5.7.11"],"package":"pro.gravit.launcher:launchserver-api","purl":"pkg:maven/pro.gravit.launcher/launchserver-api","source":"GHSA-5g75-477j-2c2f"}],"prev":{"headline":"NanaZip: Heap out-of-bounds read in NanaZip SquashFS LZ4 decompressor via unchecked negative return value","id":"CVE-2026-54616"},"products":["Launcher"],"published":"2026-09-17","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"attribution","licence":"MIT","name":"Nuclei templates"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-09-18","vendors":["GravitLauncher"]},"summary":"Unauthenticated attackers can read sensitive files via path traversal, exposing keys and credentials to enable authentication bypass.","url":"https://insights.sbomify.com/CVE-2026-54617/"}