{"id":"CVE-2026-34213","summary":"Docmost has cross-page attachment overwrite via flawed attachmentId overwrite validation","details":"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.","aliases":["GHSA-89fp-2hch-j9gp"],"modified":"2026-07-08T08:12:51.016951546Z","published":"2026-04-14T21:49:55.380Z","database_specific":{"cna_assigner":"GitHub_M","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34213.json","cwe_ids":["CWE-639"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34213.json"},{"type":"ADVISORY","url":"https://github.com/docmost/docmost/security/advisories/GHSA-89fp-2hch-j9gp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34213"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/docmost/docmost","events":[{"introduced":"73ddec4ca7415073d765cc62d100030223936b6c"},{"fixed":"642024ba9d1afcc7c14ad3c34da8495037faeaf1"}],"database_specific":{"cpe":"cpe:2.3:a:docmost:docmost:*:*:*:*:*:*:*:*","source":["AFFECTED_FIELD","CPE_RANGE"],"extracted_events":[{"introduced":"0.3.0"},{"fixed":"0.71.0"}]}}],"versions":["v0.70.2","v0.70.1","v0.70.3","v0.70.0","v0.25.3","v0.25.2","v0.25.1","v0.25.0","v0.25.0-beta.1","v0.24.1","v0.24.0","v0.23.2","v0.23.1","v0.23.0","v0.22.2","v0.22.1","v0.22.0","v0.21.0","v0.20.4","v0.20.3","v0.20.2","v0.20.1","v0.20.0","v0.10.2","v0.10.1","v0.10.0","v0.9.0","v0.8.4","v0.8.3","v0.8.2","v0.8.1","v0.8.0","v0.7.0","v0.6.2","v0.6.1","v0.6.0","v0.5.0","v0.4.1","v0.4.0","v0.3.1","v0.3.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34213.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L"}]}