{"id":"CVE-2026-34213","aliases":["EUVD-2026-22756","GHSA-89fp-2hch-j9gp"],"status":"published","title":"Docmost has cross-page attachment overwrite via flawed attachmentId overwrite validation","description":"Docmost is open-source collaborative wiki and documentation software. Starting in version 0.3.0 and prior to version 0.71.0, improper authorization in Docmost allows a low-privileged authenticated user to overwrite another page's attachment within the same workspace by supplying a victim `attachmentId` to `POST /api/files/upload`. This is a remote integrity issue requiring no victim interaction. Version 0.71.0 contains a patch.","severity":{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00242,"percentile":0.15568,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-639"],"published":"2026-04-14T21:49:55Z","modified":"2026-10-28T02:30:32Z","exploits":[{"source":"pocgithub","id":"0xmrma/CVE-2026-34213","title":"0xmrma/CVE-2026-34213","date":"2026-06-26","url":"https://github.com/0xmrma/CVE-2026-34213"}],"products":[{"vendor":"docmost","product":"docmost"}],"references":[{"url":"https://github.com/docmost/docmost/security/advisories/GHSA-89fp-2hch-j9gp","tags":["x_refsource_CONFIRM","Vendor Advisory","advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34213.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34213","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-34213","title":"Docmost has cross-page attachment overwrite via flawed attachmentId overwrite validation","description":"Docmost is open-source collaborative wiki and documentation software. Starting in version 0.3.0 and prior to version 0.71.0, improper authorization in Docmost allows a low-privileged authenticated user to overwrite another page's attachment within the same workspace by supplying a victim `attachmentId` to `POST /api/files/upload`. This is a remote integrity issue requiring no victim interaction. Version 0.71.0 contains a patch.","status":"published","published":"2026-04-14T21:49:55.38Z","modified":"2026-04-15T13:31:17.467Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-639"],"updated_at":"2026-11-02T14:20:14.302133Z"}],"euvd":[{"id":"EUVD-2026-22756","description":"Docmost is open-source collaborative wiki and documentation software. Starting in version 0.3.0 and prior to version 0.71.0, improper authorization in Docmost allows a low-privileged authenticated user to overwrite another page's attachment within the same workspace by supplying a victim `attachmentId` to `POST /api/files/upload`. This is a remote integrity issue requiring no victim interaction. Version 0.71.0 contains a patch.","status":"published","published":"2026-04-14T21:49:55Z","modified":"2026-04-15T13:31:17Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L","level":"medium"}],"updated_at":"2026-11-02T19:24:25.607055Z"}],"nvd":[{"id":"CVE-2026-34213","description":"Docmost is open-source collaborative wiki and documentation software. Starting in version 0.3.0 and prior to version 0.71.0, improper authorization in Docmost allows a low-privileged authenticated user to overwrite another page's attachment within the same workspace by supplying a victim `attachmentId` to `POST /api/files/upload`. This is a remote integrity issue requiring no victim interaction. Version 0.71.0 contains a patch.","status":"published","published":"2026-04-14T22:16:31.193Z","modified":"2026-07-24T22:10:00.14Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L","level":"medium","assessor":"secondary"}],"cwes":["CWE-639"],"updated_at":"2026-11-02T14:12:14.748836Z"}],"osv":[{"id":"CVE-2026-34213","title":"Docmost has cross-page attachment overwrite via flawed attachmentId overwrite validation","description":"Docmost is open-source collaborative wiki and documentation software. Starting in version 0.3.0 and prior to version 0.71.0, improper authorization in Docmost allows a low-privileged authenticated user to overwrite another page's attachment within the same workspace by supplying a victim `attachmentId` to `POST /api/files/upload`. This is a remote integrity issue requiring no victim interaction. Version 0.71.0 contains a patch.","status":"published","published":"2026-04-14T21:49:55.38Z","modified":"2026-10-28T02:30:32.337562771Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L","level":"medium"}],"cwes":["CWE-639"],"updated_at":"2026-11-02T15:45:02.247031Z"}]}}