{"id":"CVE-2026-34523","aliases":["EUVD-2026-18440","GHSA-525j-2hrj-m8fp"],"status":"published","title":"SillyTavern: Path traversal allows file existence oracle","description":"SillyTavern is a locally installed user interface that allows users to interact with text generation large language models, image generation engines, and text-to-speech voice models. Prior to version 1.17.0, a path traversal vulnerability in the static file route handler allows any unauthenticated user to determine whether files exist anywhere on the server's filesystem. by sending percent-encoded \"../\" sequences (%2E%2E%2F) in requests to static file routes, an attacker can check for the existence of files. This issue has been patched in version 1.17.0.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00467,"percentile":0.40736,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-22"],"published":"2026-04-01T21:40:22Z","modified":"2026-10-28T02:30:24Z","fixes":[{"ecosystem":"npm","package":"sillytavern","fixed_in":["1.17.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"sillytavern","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.16.0"},{"fixed":"1.17.0"}]}]},{"source":"osv","ecosystem":"npm","package":"sillytavern","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.17.0"}]}]}],"products":[{"vendor":"sillytavern","product":"sillytavern"}],"references":[{"url":"https://github.com/SillyTavern/SillyTavern/security/advisories/GHSA-525j-2hrj-m8fp","tags":["x_refsource_CONFIRM","Exploit","Vendor Advisory","advisory","web"]},{"url":"https://github.com/SillyTavern/SillyTavern/releases/tag/1.17.0","tags":["x_refsource_MISC","Release Notes","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34523","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-525j-2hrj-m8fp"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34523.json","tags":["advisory"]},{"url":"https://github.com/SillyTavern/SillyTavern","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-34523","title":"SillyTavern: Path traversal allows file existence oracle","description":"SillyTavern is a locally installed user interface that allows users to interact with text generation large language models, image generation engines, and text-to-speech voice models. Prior to version 1.17.0, a path traversal vulnerability in the static file route handler allows any unauthenticated user to determine whether files exist anywhere on the server's filesystem. by sending percent-encoded \"../\" sequences (%2E%2E%2F) in requests to static file routes, an attacker can check for the existence of files. This issue has been patched in version 1.17.0.","status":"published","published":"2026-04-02T17:14:31.694Z","modified":"2026-04-03T15:56:24.472Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:20:14.302133Z"}],"euvd":[{"id":"EUVD-2026-18440","description":"SillyTavern is a locally installed user interface that allows users to interact with text generation large language models, image generation engines, and text-to-speech voice models. Prior to version 1.17.0, a path traversal vulnerability in the static file route handler allows any unauthenticated user to determine whether files exist anywhere on the server's filesystem. by sending percent-encoded \"../\" sequences (%2E%2E%2F) in requests to static file routes, an attacker can check for the existence of files. This issue has been patched in version 1.17.0.","status":"published","published":"2026-04-02T17:14:31Z","modified":"2026-04-03T15:56:24Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T19:25:16.92155Z"}],"ghsa":[{"id":"GHSA-525j-2hrj-m8fp","title":"SillyTavern: Path Traversal allows file existence oracle","description":"### Summary\n\nA path traversal vulnerability in the static file route handler allows any unauthenticated user to determine whether files exist anywhere on the server's filesystem. By sending percent-encoded `../` sequences (`%2E%2E%2F`) in requests to static file routes, an attacker can check for the existence of files (404 if it doesn't exist, 403 means it exists).\n\n### Details\n\nThe vulnerability is in `createRouteHandler` (`src/users.js:947–963`), which backs all user-data static file routes:\n\n```javascript\nfunction createRouteHandler(directoryFn) {\n    return async (req, res) =\u003e {\n        const directory = directoryFn(req);\n        const filePath = decodeURIComponent(req.params[0]);\n        const exists = fs.existsSync(path.join(directory, filePath)); // no boundary check here\n        if (!exists) {\n            return res.sendStatus(404);\n        }\n        return res.sendFile(filePath, { root: directory });\n    };\n}\n```\n\n`req.params[0]` contains the raw (percent-encoded) wildcard from the URL. After `decodeURIComponent`, a request path like `/characters/%2E%2E%2F%2E%2E%2FUsers/kirakira` decodes to `../../Users/kirakira`, and `path.join` resolves it outside the intended directory. `res.sendFile` correctly blocks the file from being served (the `send` module's root check returns 403), but `fs.existsSync` had already run, and the 403/404 distinction reveals the result.\n\nAffected routes (they all use the same handler, so they're all affected):\n\n- `/characters/*`\n- `/user/files/*`\n- `/assets/*`\n- `/user/images/*`\n- `/backgrounds/*`\n- `/User%20Avatars/*`\n\n### PoC\n\n```bash\ncurl -o /dev/null -s -w \"%{http_code}\\n\" \"http://localhost:8000/characters/%2E%2E%2F%2E%2E%2F%2E%2E%2F%2E%2E%2F%2E%2E%2F%2E%2E%2F%2E%2E%2FUsers/kirakira/something\"\n```\n\n### Impact\n\nWhile file contents cannot be read (the `send` module blocks actual delivery), anyone who can reach the SillyTavern HTTP port can check the existence of files on the host filesystem.\n\n### Resolution\n\nThe issue was addressed in version 1.17.0.","status":"published","published":"2026-04-01T21:40:22Z","modified":"2026-04-06T17:24:21Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:39:48.966685Z"}],"nvd":[{"id":"CVE-2026-34523","description":"SillyTavern is a locally installed user interface that allows users to interact with text generation large language models, image generation engines, and text-to-speech voice models. Prior to version 1.17.0, a path traversal vulnerability in the static file route handler allows any unauthenticated user to determine whether files exist anywhere on the server's filesystem. by sending percent-encoded \"../\" sequences (%2E%2E%2F) in requests to static file routes, an attacker can check for the existence of files. This issue has been patched in version 1.17.0.","status":"published","published":"2026-04-02T18:16:29.613Z","modified":"2026-07-24T21:10:00.143Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:12:12.73929Z"}],"osv":[{"id":"CVE-2026-34523","title":"SillyTavern: Path traversal allows file existence oracle","description":"SillyTavern is a locally installed user interface that allows users to interact with text generation large language models, image generation engines, and text-to-speech voice models. Prior to version 1.17.0, a path traversal vulnerability in the static file route handler allows any unauthenticated user to determine whether files exist anywhere on the server's filesystem. by sending percent-encoded \"../\" sequences (%2E%2E%2F) in requests to static file routes, an attacker can check for the existence of files. This issue has been patched in version 1.17.0.","status":"published","published":"2026-04-02T17:14:31.694Z","modified":"2026-10-28T02:30:24.265601125Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:45:02.247031Z"},{"id":"GHSA-525j-2hrj-m8fp","title":"SillyTavern: Path Traversal allows file existence oracle","description":"### Summary\n\nA path traversal vulnerability in the static file route handler allows any unauthenticated user to determine whether files exist anywhere on the server's filesystem. By sending percent-encoded `../` sequences (`%2E%2E%2F`) in requests to static file routes, an attacker can check for the existence of files (404 if it doesn't exist, 403 means it exists).\n\n### Details\n\nThe vulnerability is in `createRouteHandler` (`src/users.js:947–963`), which backs all user-data static file routes:\n\n```javascript\nfunction createRouteHandler(directoryFn) {\n    return async (req, res) =\u003e {\n        const directory = directoryFn(req);\n        const filePath = decodeURIComponent(req.params[0]);\n        const exists = fs.existsSync(path.join(directory, filePath)); // no boundary check here\n        if (!exists) {\n            return res.sendStatus(404);\n        }\n        return res.sendFile(filePath, { root: directory });\n    };\n}\n```\n\n`req.params[0]` contains the raw (percent-encoded) wildcard from the URL. After `decodeURIComponent`, a request path like `/characters/%2E%2E%2F%2E%2E%2FUsers/kirakira` decodes to `../../Users/kirakira`, and `path.join` resolves it outside the intended directory. `res.sendFile` correctly blocks the file from being served (the `send` module's root check returns 403), but `fs.existsSync` had already run, and the 403/404 distinction reveals the result.\n\nAffected routes (they all use the same handler, so they're all affected):\n\n- `/characters/*`\n- `/user/files/*`\n- `/assets/*`\n- `/user/images/*`\n- `/backgrounds/*`\n- `/User%20Avatars/*`\n\n### PoC\n\n```bash\ncurl -o /dev/null -s -w \"%{http_code}\\n\" \"http://localhost:8000/characters/%2E%2E%2F%2E%2E%2F%2E%2E%2F%2E%2E%2F%2E%2E%2F%2E%2E%2F%2E%2E%2FUsers/kirakira/something\"\n```\n\n### Impact\n\nWhile file contents cannot be read (the `send` module blocks actual delivery), anyone who can reach the SillyTavern HTTP port can check the existence of files on the host filesystem.\n\n### Resolution\n\nThe issue was addressed in version 1.17.0.","status":"published","published":"2026-04-01T21:40:22Z","modified":"2026-04-06T17:31:29.470446Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:46:37.528068Z"}]}}