CVE-2023-39953

MediumCVSS 4.8/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 4.8/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Weakness enumeration

CWE-303

Affected software

No affected versions have been published.

Timeline

Published
Aug 10, 2023
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2023-39953: Medium severity, CVSS 4.8 | Vulnix