CVE-2023-39953
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2023-39953
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-39953.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2023-39953
- Aliases
-
- GHSA-xx3h-v363-q36j
- Published
- 2023-08-10T13:55:19.957Z
- Modified
- 2025-11-29T14:31:49.522879Z
- Severity
-
- 4.8 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N CVSS Calculator
- Summary
- Issuer not verified from obtained token in user_oidc
- Details
-
useroidc 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. useroidc 1.3.3 contains a patch. No known workarounds are available.
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/39xxx/CVE-2023-39953.json", "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-303" ] }- References
-
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/39xxx/CVE-2023-39953.json
- 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
- https://nvd.nist.gov/vuln/detail/CVE-2023-39953