{"id":"CVE-2026-77633","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-77633","generatedAt":"2026-10-28T03:58:12.408Z","title":"Cloudreve is a self-hosted file management and sharing system.","description":"Cloudreve is a self-hosted file management and sharing system. Prior to 4.18.0, PrepareUpload in pkg/filemanager/fs/dbfs/upload.go checks a stale in-memory user storage value through validateUserCapacity and later applies an unconditional storage charge outside the same quota-enforcing transaction. An authenticated user with Files.Write permission can issue concurrent upload-session requests that read the same capacity snapshot, all pass the MaxStorage check, and reserve their declared sizes through CommitWithStorageDiff. The resulting reservations can exceed the account quota and can be materialized as chunked uploads that exhaust host storage and deny uploads to other users. The default local-storage policy and default User group are affected. This issue is fixed in version 4.18.0.","published":"2026-09-22T16:17:56.000Z","lastModified":"2026-09-26T00:16:36.000Z","status":"Deferred","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":7.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H"},"cwe":["CWE-362","CWE-367","CWE-770"],"affected":[],"epss":{"score":0.00368,"percentile":0.30541,"date":"2026-10-27","history":[{"date":"2026-09-23","score":0.00368,"percentile":0.30702}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.37%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-09-22T16:17:56.000Z","detail":{"score":"7.1","severity":"HIGH","publishedAt":"2026-09-22T16:17:55.817Z"},"summary":"New CVE, high severity (CVSS 7.1)."}],"references":[{"url":"https://github.com/cloudreve/cloudreve/commit/7329602751c00bb4136fe9ad8b364d0df70773df","source":"security-advisories@github.com"},{"url":"https://github.com/cloudreve/cloudreve/releases/tag/4.18.0","source":"security-advisories@github.com"},{"url":"https://github.com/cloudreve/cloudreve/security/advisories/GHSA-xj3h-wwxq-gfcj","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-77633","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}