{"id":"CVE-2026-62323","summary":"Cloudreve: Unauthorized file write via WOPI view sessions whose access token secret is ignored","details":"Cloudreve is a self-hosted file management and sharing system. Prior to 4.17.0, ViewerSessionValidation uses only the session-id prefix of a WOPI access token and does not enforce the requested viewer action, allowing a malicious or compromised WOPI viewer with a view session to forge the token suffix and invoke WOPI write routes for the underlying file. This issue is fixed in version 4.17.0.","aliases":["GHSA-c3jm-gv5r-9wcp"],"modified":"2026-08-02T03:32:13.295455768Z","published":"2026-07-31T03:43:14.900Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-863"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/62xxx/CVE-2026-62323.json"},"references":[{"type":"WEB","url":"https://github.com/cloudreve/cloudreve/releases/tag/4.17.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/62xxx/CVE-2026-62323.json"},{"type":"ADVISORY","url":"https://github.com/cloudreve/cloudreve/security/advisories/GHSA-c3jm-gv5r-9wcp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-62323"},{"type":"FIX","url":"https://github.com/cloudreve/cloudreve/commit/f3347130ac48f2ff996af9ef66c97be2dda9cba9"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/cloudreve/cloudreve","events":[{"introduced":"0"},{"fixed":"f3347130ac48f2ff996af9ef66c97be2dda9cba9"},{"fixed":"d4a145c3ac68f08b9071dec0f2ac025c6dc7362d"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"4.17.0"}]}}],"versions":["4.16.1","4.16.0","4.15.0","4.14.1","4.14.0","4.13.0","4.12.1","4.12.0","4.11.1","4.11.0","4.10.1","4.10.0","4.9.2","4.9.1","4.9.0","4.8.0","4.7.0","4.6.0","4.5.1","4.5.0","4.4.1","4.4.0","4.3.0","4.2.0","4.1.3","4.1.2","4.1.1","4.1.0","4.0.0","4.0.0-beta.14","4.0.0-beta.13","4.0.0-beta.12","4.0.0-beta.11","4.0.0-beta.10","4.0.0-beta.9","4.0.0-beta.8","4.0.0-beta.7","4.0.0-beta.6","3.8.3","3.8.2","3.8.1","3.8.0","3.8.0-beta1","3.7.1","3.7.0","3.6.2","3.6.1","3.6.0","3.6.0-beta1","3.5.3","3.5.2","3.5.1","3.5.0","3.5.0-beta.3","3.5.0-beta2","3.5.0-beta1","3.4.2","3.4.1","3.4.0","3.4.0-beta1","3.3.2","3.3.1","3.3.0","3.2.1","3.2.0","3.1.1","3.1.0","3.0.0","3.0.0-rc1","3.0.0-beta3","3.0.0-beta2","3.0.0-beta1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-62323.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N"}]}