{"id":"CVE-2026-62323","title":"Cloudreve is a self-hosted file management and sharing system","summary":"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 comp…","severity":"medium","cvss":6.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N","cwe":["CWE-863"],"vendor":"cloudreve","product":"github.com/cloudreve/Cloudreve/v4","affected":["github.com/cloudreve/Cloudreve/v4 < 4.0.0-20260626022433-f3347130ac48","github.com/cloudreve/Cloudreve/v3 <= 3.0.0-20250225100611-da4e44b77af4"],"patched":["github.com/cloudreve/Cloudreve/v4 4.0.0-20260626022433-f3347130ac48"],"published":"2026-07-31","updated":"2026-09-08","sourceUpdated":"2026-09-08T20:51:43.490","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-62323","references":[{"url":"https://github.com/cloudreve/cloudreve/commit/f3347130ac48f2ff996af9ef66c97be2dda9cba9","label":"security-advisories@github.com"},{"url":"https://github.com/cloudreve/cloudreve/releases/tag/4.17.0","label":"security-advisories@github.com"},{"url":"https://github.com/cloudreve/cloudreve/security/advisories/GHSA-c3jm-gv5r-9wcp","label":"security-advisories@github.com"},{"url":"https://github.com/cloudreve/cloudreve/security/advisories/GHSA-c3jm-gv5r-9wcp","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://github.com/advisories/GHSA-c3jm-gv5r-9wcp"}],"tags":["nvd","ghsa","go"],"epss":0.00171,"epssPercentile":0.06798,"aliases":["GHSA-c3jm-gv5r-9wcp"],"ecosystem":"go","ingestedAt":"2026-07-24T21:39:14.193Z","slug":"CVE-2026-62323","body":"## Overview\n\nCloudreve 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-62323)\n\nAffected packages:\n\n- `github.com/cloudreve/Cloudreve/v4 < 4.0.0-20260626022433-f3347130ac48`\n- `github.com/cloudreve/Cloudreve/v3 <= 3.0.0-20250225100611-da4e44b77af4`\n\nPatched in:\n\n- `github.com/cloudreve/Cloudreve/v4 4.0.0-20260626022433-f3347130ac48`\n\nSource: https://github.com/advisories/GHSA-c3jm-gv5r-9wcp","depth":"sunlit","depthScore":35,"depthScoreParts":{"impact":34.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}