{"schemaVersion":3,"id":"CVE-2023-39954","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"user_oidc provides the OIDC connect user backend for Nextcloud, an open-source cloud platform. Starting in version 1.0.0 and prior to version 1.3.3, an attacker that obtained at least read access to a snapshot of the database can impersonate the Nextcloud server towards linked servers. user_oidc 1.3.3 contains a patch. No known workarounds are available.","dates":{"published":"2023-08-10T14:32:27.032Z","modified":"2024-10-03T15:08:09.372Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":8.1,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":3.8,"severity":"low","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":8.1,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00444,"percentile":0.37253,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.00444},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00444,"percentile":0.37253}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00444,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00444,"percentile":0.37253}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-311","name":"Missing Encryption of Sensitive Data","description":"The product does not encrypt sensitive or critical information before storage or transmission.","type":"weakness","status":"Draft","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/311.html"}],"affected":[{"vendor":"nextcloud","product":"security-advisories","name":"security-advisories","label":"security-advisories","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 1.0.0, < 1.3.3","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 1.0.0, < 1.3.3","eol":null,"hubHref":"/vendor/nextcloud/security-advisories"},{"vendor":"nextcloud","product":"user_oidc","name":"user oidc","label":"user_oidc","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 1.0.0, < 1.3.3","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 1.0.0, < 1.3.3","eol":null,"hubHref":"/vendor/nextcloud/user_oidc"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-3f92-5c8p-f6gq","label":"github.com/nextcloud/security-advisories/security/advisories/GHSA-3f92-5c8p-f6gq","hostname":"github.com","tags":["X Refsource CONFIRM","Patch","Vendor Advisory"]},{"url":"https://github.com/nextcloud/user_oidc/pull/636","label":"github.com/nextcloud/user_oidc/pull/636","hostname":"github.com","tags":["X Refsource MISC","Patch"]},{"url":"https://hackerone.com/reports/1994328","label":"hackerone.com/reports/1994328","hostname":"hackerone.com","tags":["X Refsource MISC","Permissions Required"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2023-08-10T14:32:27.032Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-10-03T15:08:09.372Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":32,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T06:37:23.434Z","stale":false,"partial":false}}