{"id":"CVE-2026-62323","state":"PUBLISHED","title":"Cloudreve: Unauthorized file write via WOPI view sessions whose access token secret is ignored","description":"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.","publishedAt":"2026-07-31T03:43:14.900Z","updatedAt":"2026-07-31T19:28:19.622Z","severity":{"score":6.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["cloudreve cloudreve"],"affected":[{"vendor":"cloudreve","product":"cloudreve","versions":[{"version":"< 4.17.0","status":"affected"}]}],"references":["https://github.com/cloudreve/cloudreve/security/advisories/GHSA-c3jm-gv5r-9wcp","https://github.com/cloudreve/cloudreve/commit/f3347130ac48f2ff996af9ef66c97be2dda9cba9","https://github.com/cloudreve/cloudreve/releases/tag/4.17.0"],"weaknesses":["CWE-863"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/62xxx/CVE-2026-62323.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-62323","state":"PUBLISHED","datePublished":"2026-07-31T03:43:14.900Z","dateUpdated":"2026-07-31T19:28:19.622Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-07-13T19:27:58.315Z"},"containers":{"cna":{"title":"Cloudreve: Unauthorized file write via WOPI view sessions whose access token secret is ignored","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"cloudreve","product":"cloudreve","versions":[{"version":"< 4.17.0","status":"affected"}]}],"references":[{"url":"https://github.com/cloudreve/cloudreve/security/advisories/GHSA-c3jm-gv5r-9wcp","name":"https://github.com/cloudreve/cloudreve/security/advisories/GHSA-c3jm-gv5r-9wcp","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/cloudreve/cloudreve/commit/f3347130ac48f2ff996af9ef66c97be2dda9cba9","name":"https://github.com/cloudreve/cloudreve/commit/f3347130ac48f2ff996af9ef66c97be2dda9cba9","tags":["x_refsource_MISC"]},{"url":"https://github.com/cloudreve/cloudreve/releases/tag/4.17.0","name":"https://github.com/cloudreve/cloudreve/releases/tag/4.17.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-863","lang":"en","description":"CWE-863: Incorrect Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-31T03:43:14.900Z"},"source":{"advisory":"GHSA-c3jm-gv5r-9wcp","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/cloudreve/cloudreve/security/advisories/GHSA-c3jm-gv5r-9wcp","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-31T19:27:35.115914Z","id":"CVE-2026-62323","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-31T19:28:19.622Z"}}]}}}