{"id":"CVE-2026-22810","aliases":["EUVD-2026-30806","GHSA-gcmj-c9gg-9vh6"],"status":"published","title":"Joplin: Path traversal in OneNote importer allows overwriting arbitrary files","description":"Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Versions prior to 3.5.7 contain a path traversal vulnerability in the importer which allows overwriting arbitrary files on disk. The OneNote converter does not sanitize the names of embedded files before writing them to disk. As a result, it's possible for an attacker to create a malicious .one file that includes file names containing ../../, that are then interpreted as part of the target path when extracting attachments from the .one file. This issue has been patched in version 3.5.7.","severity":{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00206,"percentile":0.1077,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-24"],"published":"2026-05-15T16:27:11Z","modified":"2026-10-28T02:30:48Z","fixes":[{"ecosystem":"npm","package":"@joplin/onenote-converter","fixed_in":["3.5.7"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@joplin/onenote-converter","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.5.7"}]}]},{"source":"osv","ecosystem":"npm","package":"@joplin/onenote-converter","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.5.7"}]}]}],"products":[{"vendor":"joplinapp","product":"joplin"},{"vendor":"laurent22","product":"joplin"},{"vendor":"msiemens","product":"one2html"}],"references":[{"url":"https://github.com/laurent22/joplin/security/advisories/GHSA-gcmj-c9gg-9vh6","tags":["x_refsource_CONFIRM","exploit","Vendor Advisory","advisory","web"]},{"url":"https://github.com/laurent22/joplin/pull/13736","tags":["x_refsource_MISC","Issue Tracking","fix","web"]},{"url":"https://github.com/laurent22/joplin/commit/791668455e1aae50501ff57ea4783b3fba9d377c","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://github.com/laurent22/joplin/blob/af5108d70233b1db9410346958c1587cf7c1b16d/packages/onenote-converter/renderer/src/page/embedded_file.rs#L13-L16","tags":["x_refsource_MISC","Product","web"]},{"url":"https://github.com/laurent22/joplin/releases/tag/v3.5.7","tags":["x_refsource_MISC","Patch","Product","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-22810","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-gcmj-c9gg-9vh6"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/22xxx/CVE-2026-22810.json","tags":["advisory"]},{"url":"https://github.com/laurent22/joplin","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-22810","title":"Joplin: Path traversal in OneNote importer allows overwriting arbitrary files","description":"Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Versions prior to 3.5.7 contain a path traversal vulnerability in the importer which allows overwriting arbitrary files on disk. The OneNote converter does not sanitize the names of embedded files before writing them to disk. As a result, it's possible for an attacker to create a malicious .one file that includes file names containing ../../, that are then interpreted as part of the target path when extracting attachments from the .one file. This issue has been patched in version 3.5.7.","status":"published","published":"2026-05-18T20:23:57.607Z","modified":"2026-05-20T03:55:23.355Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-24"],"updated_at":"2026-11-02T13:39:16.730222Z"}],"euvd":[{"id":"EUVD-2026-30806","description":"Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Versions prior to 3.5.7 contain a path traversal vulnerability in the importer which allows overwriting arbitrary files on disk. The OneNote converter does not sanitize the names of embedded files before writing them to disk. As a result, it's possible for an attacker to create a malicious .one file that includes file names containing ../../, that are then interpreted as part of the target path when extracting attachments from the .one file. This issue has been patched in version 3.5.7.","status":"published","published":"2026-05-18T20:23:57Z","modified":"2026-05-20T03:55:23Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T18:21:15.217097Z"}],"ghsa":[{"id":"GHSA-gcmj-c9gg-9vh6","title":"@joplin/onenote-converter: Path traversal in OneNote importer allows overwriting arbitrary files","description":"### Summary\nA path traversal vulnerability in the OneNote importer allows overwriting arbitrary files on disk.\n\n### Details\nThe OneNote converter does not sanitize the names of embedded files before writing them to disk. As a result, it's possible for an attacker to create a malicious `.one` file that includes file names containing `../../`, that are then interpreted as part of the target path when extracting attachments from the `.one` file.\n\nOne affected location is `embedded_file.rs`, which generates a file name from a string previously parsed from the `.one` file,\nhttps://github.com/laurent22/joplin/blob/af5108d70233b1db9410346958c1587cf7c1b16d/packages/onenote-converter/renderer/src/page/embedded_file.rs#L13-L16\n\nAbove, [`determine_filename`](https://github.com/laurent22/joplin/blob/af5108d70233b1db9410346958c1587cf7c1b16d/packages/onenote-converter/renderer/src/page/embedded_file.rs#L56-L64) passes through the provided file name.\n\n[Similar logic](https://github.com/laurent22/joplin/blob/4d7fa5972fe2986eae14cbf3a2801835cbe1384e/packages/onenote-converter/src/page/embedded_file.rs#L14) has been present since 4d7fa5972fe2986eae14cbf3a2801835cbe1384e (Joplin 3.2.2), when the OneNote importer was first introduced.\n\n### PoC\n\n[Screencast from 2025-11-20 13-50-21.webm](https://github.com/user-attachments/assets/a9d6cc64-ec11-4f33-9f92-32efe0eaab23)\n\n\n1. Import [poc_v2.zip](https://github.com/user-attachments/files/23664109/poc_v2.zip).\n2. Open the application's profile directory, then open `log.txt`.\n3. Observe that `log.txt` has been overwritten non-log-file content (a WAV file).\n\nTested on Fedora Linux 43 with Joplin 3.4.12 (prod, linux) and Joplin 3.5.6 (dev, linux).\n\n**Note**: The PoC ZIP file overwrites Joplin's `log.txt`. It is also possible to craft a file that overwrites more sensitive system files (e.g. `.bashrc` on Linux).\n\n### Impact\nThis is a path traversal vulnerability that impacts **all versions of Joplin (\u003c= v3.5.6) that include a OneNote importer**. Importing a crafted OneNote export file allows an attacker to overwrite arbitrary files, potentially leading to remote code execution.\n\n### Patched in\n\n- **Joplin**: https://github.com/laurent22/joplin/commit/791668455e1aae50501ff57ea4783b3fba9d377c\n- **one2html**: https://github.com/msiemens/one2html/commit/948d65cdca5bb35d776b8b235ec05ff15249fd41","status":"published","published":"2026-05-15T16:27:11Z","modified":"2026-05-19T16:08:56Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-24"],"updated_at":"2026-11-02T14:40:12.430932Z"}],"nvd":[{"id":"CVE-2026-22810","description":"Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Versions prior to 3.5.7 contain a path traversal vulnerability in the importer which allows overwriting arbitrary files on disk. The OneNote converter does not sanitize the names of embedded files before writing them to disk. As a result, it's possible for an attacker to create a malicious .one file that includes file names containing ../../, that are then interpreted as part of the target path when extracting attachments from the .one file. This issue has been patched in version 3.5.7.","status":"published","published":"2026-05-18T21:16:39.373Z","modified":"2026-07-24T13:10:00.223Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-24"],"updated_at":"2026-11-02T14:12:19.39893Z"}],"osv":[{"id":"CVE-2026-22810","title":"Joplin: Path traversal in OneNote importer allows overwriting arbitrary files","description":"Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Versions prior to 3.5.7 contain a path traversal vulnerability in the importer which allows overwriting arbitrary files on disk. The OneNote converter does not sanitize the names of embedded files before writing them to disk. As a result, it's possible for an attacker to create a malicious .one file that includes file names containing ../../, that are then interpreted as part of the target path when extracting attachments from the .one file. This issue has been patched in version 3.5.7.","status":"published","published":"2026-05-18T20:23:57.607Z","modified":"2026-10-28T02:30:48.013647313Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-24"],"updated_at":"2026-11-02T15:44:58.749922Z"},{"id":"GHSA-gcmj-c9gg-9vh6","title":"@joplin/onenote-converter: Path traversal in OneNote importer allows overwriting arbitrary files","description":"### Summary\nA path traversal vulnerability in the OneNote importer allows overwriting arbitrary files on disk.\n\n### Details\nThe OneNote converter does not sanitize the names of embedded files before writing them to disk. As a result, it's possible for an attacker to create a malicious `.one` file that includes file names containing `../../`, that are then interpreted as part of the target path when extracting attachments from the `.one` file.\n\nOne affected location is `embedded_file.rs`, which generates a file name from a string previously parsed from the `.one` file,\nhttps://github.com/laurent22/joplin/blob/af5108d70233b1db9410346958c1587cf7c1b16d/packages/onenote-converter/renderer/src/page/embedded_file.rs#L13-L16\n\nAbove, [`determine_filename`](https://github.com/laurent22/joplin/blob/af5108d70233b1db9410346958c1587cf7c1b16d/packages/onenote-converter/renderer/src/page/embedded_file.rs#L56-L64) passes through the provided file name.\n\n[Similar logic](https://github.com/laurent22/joplin/blob/4d7fa5972fe2986eae14cbf3a2801835cbe1384e/packages/onenote-converter/src/page/embedded_file.rs#L14) has been present since 4d7fa5972fe2986eae14cbf3a2801835cbe1384e (Joplin 3.2.2), when the OneNote importer was first introduced.\n\n### PoC\n\n[Screencast from 2025-11-20 13-50-21.webm](https://github.com/user-attachments/assets/a9d6cc64-ec11-4f33-9f92-32efe0eaab23)\n\n\n1. Import [poc_v2.zip](https://github.com/user-attachments/files/23664109/poc_v2.zip).\n2. Open the application's profile directory, then open `log.txt`.\n3. Observe that `log.txt` has been overwritten non-log-file content (a WAV file).\n\nTested on Fedora Linux 43 with Joplin 3.4.12 (prod, linux) and Joplin 3.5.6 (dev, linux).\n\n**Note**: The PoC ZIP file overwrites Joplin's `log.txt`. It is also possible to craft a file that overwrites more sensitive system files (e.g. `.bashrc` on Linux).\n\n### Impact\nThis is a path traversal vulnerability that impacts **all versions of Joplin (\u003c= v3.5.6) that include a OneNote importer**. Importing a crafted OneNote export file allows an attacker to overwrite arbitrary files, potentially leading to remote code execution.\n\n### Patched in\n\n- **Joplin**: https://github.com/laurent22/joplin/commit/791668455e1aae50501ff57ea4783b3fba9d377c\n- **one2html**: https://github.com/msiemens/one2html/commit/948d65cdca5bb35d776b8b235ec05ff15249fd41","status":"published","published":"2026-05-15T16:27:11Z","modified":"2026-09-10T03:51:05.68999188Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-24"],"updated_at":"2026-11-02T15:46:47.822182Z"}]}}