{"id":"CVE-2026-54560","state":"PUBLISHED","title":"Cloudreve: OAuth access tokens bypass scope enforcement due to missing client_id claim","description":"Cloudreve is a self-hosted file management and sharing system. From 4.12.0 until 4.16.1, Cloudreve's OAuth access tokens are issued without the OAuth client_id claim, so the JWT verifier does not load token scopes into request context and RequiredScopes treats the request like non-scoped session authentication, allowing a low-scope OAuth access token to call APIs requiring higher scopes such as file, share, workflow, user setting, WebDAV account, and potentially admin scopes. This issue is fixed in version 4.16.1.","publishedAt":"2026-07-15T14:40:24.765Z","updatedAt":"2026-07-15T15:16:35.699Z","severity":{"score":7.6,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["cloudreve cloudreve"],"affected":[{"vendor":"cloudreve","product":"cloudreve","versions":[{"version":">= 4.12.0, < 4.16.1","status":"affected"}]}],"references":["https://github.com/cloudreve/cloudreve/security/advisories/GHSA-vgj4-345g-jcf8","https://github.com/cloudreve/cloudreve/commit/ed20843dc3df20a25fcaf6b538647e11c4d68d87","https://github.com/cloudreve/cloudreve/releases/tag/4.16.1"],"weaknesses":["CWE-863"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/54xxx/CVE-2026-54560.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-54560","state":"PUBLISHED","datePublished":"2026-07-15T14:40:24.765Z","dateUpdated":"2026-07-15T15:16:35.699Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-15T19:04:14.457Z"},"containers":{"cna":{"title":"Cloudreve: OAuth access tokens bypass scope enforcement due to missing client_id claim","descriptions":[{"lang":"en","value":"Cloudreve is a self-hosted file management and sharing system. From 4.12.0 until 4.16.1, Cloudreve's OAuth access tokens are issued without the OAuth client_id claim, so the JWT verifier does not load token scopes into request context and RequiredScopes treats the request like non-scoped session authentication, allowing a low-scope OAuth access token to call APIs requiring higher scopes such as file, share, workflow, user setting, WebDAV account, and potentially admin scopes. This issue is fixed in version 4.16.1."}],"affected":[{"vendor":"cloudreve","product":"cloudreve","versions":[{"version":">= 4.12.0, < 4.16.1","status":"affected"}]}],"references":[{"url":"https://github.com/cloudreve/cloudreve/security/advisories/GHSA-vgj4-345g-jcf8","name":"https://github.com/cloudreve/cloudreve/security/advisories/GHSA-vgj4-345g-jcf8","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/cloudreve/cloudreve/commit/ed20843dc3df20a25fcaf6b538647e11c4d68d87","name":"https://github.com/cloudreve/cloudreve/commit/ed20843dc3df20a25fcaf6b538647e11c4d68d87","tags":["x_refsource_MISC"]},{"url":"https://github.com/cloudreve/cloudreve/releases/tag/4.16.1","name":"https://github.com/cloudreve/cloudreve/releases/tag/4.16.1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":7.6,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L","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":"2026-07-15T14:40:24.765Z"},"source":{"advisory":"GHSA-vgj4-345g-jcf8","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/cloudreve/cloudreve/security/advisories/GHSA-vgj4-345g-jcf8","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-15T15:16:30.603425Z","id":"CVE-2026-54560","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-15T15:16:35.699Z"}}]}}}