VULNERABILITY INTELLIGENCE
CVE-2023-39953
CVSS score4.8 MEDIUM
EPSS probability0.54%
CISA KEVNot currently listed
Published2023-08-10
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
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.
Weakness classification
- security-advisories@github.com: CWE-303
Primary references
- security-advisories@github.com — Patch, Vendor Advisory
- security-advisories@github.com — Patch
- security-advisories@github.com — Permissions Required
- af854a3a-2127-422b-91ae-364da2661108 — Patch, Vendor Advisory
- af854a3a-2127-422b-91ae-364da2661108 — Patch
- af854a3a-2127-422b-91ae-364da2661108 — Permissions Required