{"id":"CVE-2023-39953","state":"PUBLISHED","title":"Issuer not verified from obtained token in user_oidc","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, missing verification of the issuer would have allowed an attacker to perform a man-in-the-middle attack returning corrupted or known token they also have access to. user_oidc 1.3.3 contains a patch. No known workarounds are available.","publishedAt":"2023-08-10T13:55:19.957Z","updatedAt":"2024-10-03T15:11:48.536Z","severity":{"score":4.8,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["nextcloud security-advisories"],"affected":[{"vendor":"nextcloud","product":"security-advisories","versions":[{"version":">= 1.0.0, < 1.3.3","status":"affected"}]}],"references":["https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xx3h-v363-q36j","https://github.com/nextcloud/user_oidc/pull/642","https://hackerone.com/reports/2021684"],"weaknesses":["CWE-303"],"ingestedAt":"2026-10-29T20:06:08.715Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/39xxx/CVE-2023-39953.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2023-39953","state":"PUBLISHED","datePublished":"2023-08-10T13:55:19.957Z","dateUpdated":"2024-10-03T15:11:48.536Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2023-08-07T16:27:27.075Z"},"containers":{"cna":{"title":"Issuer not verified from obtained token in user_oidc","descriptions":[{"lang":"en","value":"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, missing verification of the issuer would have allowed an attacker to perform a man-in-the-middle attack returning corrupted or known token they also have access to. user_oidc 1.3.3 contains a patch. No known workarounds are available."}],"affected":[{"vendor":"nextcloud","product":"security-advisories","versions":[{"version":">= 1.0.0, < 1.3.3","status":"affected"}]}],"references":[{"url":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xx3h-v363-q36j","name":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xx3h-v363-q36j","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/nextcloud/user_oidc/pull/642","name":"https://github.com/nextcloud/user_oidc/pull/642","tags":["x_refsource_MISC"]},{"url":"https://hackerone.com/reports/2021684","name":"https://hackerone.com/reports/2021684","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.8,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-303","lang":"en","description":"CWE-303: Incorrect Implementation of Authentication Algorithm","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2023-08-10T13:55:19.957Z"},"source":{"advisory":"GHSA-xx3h-v363-q36j","discovery":"UNKNOWN"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xx3h-v363-q36j","name":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xx3h-v363-q36j","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"https://github.com/nextcloud/user_oidc/pull/642","name":"https://github.com/nextcloud/user_oidc/pull/642","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://hackerone.com/reports/2021684","name":"https://hackerone.com/reports/2021684","tags":["x_refsource_MISC","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-02T18:18:10.180Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2024-10-03T15:08:38.977974Z","id":"CVE-2023-39953","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-10-03T15:11:48.536Z"}}]}}}