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Case File

CVE-2023-39953

MEDIUM · CVSS 4.8 EPSS 0.45% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2023-08-10 · Last synced 2026-08-04

CyberRota Analysis

AI analysis pending.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links
github.com ↗ github.com ↗

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2023-39953
Severity
MEDIUM
CVSS
4.8
EPSS
0.45%

Original NVD 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.