Medium severity4.8NVD Advisory· Published Aug 10, 2023· Updated Jun 17, 2026
CVE-2023-39953
CVE-2023-39953
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.
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Affected products
2- nextcloud/security-advisoriesv5Range: >= 1.0.0, < 1.3.3
Patches
Vulnerability mechanics
References
3- github.com/nextcloud/security-advisories/security/advisories/GHSA-xx3h-v363-q36jnvdPatchVendor Advisory
- github.com/nextcloud/user_oidc/pull/642nvdPatch
- hackerone.com/reports/2021684nvdPermissions Required
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