CVE-2023-39953CWE-303

Issuer not verified from obtained token in user_oidc

Medium · published August 10, 2023

CVSS v3.1
4.8
EPSS
1%
Percentile
44.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.8 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00542 · 44.8th percentile
Weakness
CWE-303 · Incorrect Implementation of Authentication Algorithm
Published
2023-08-10T13:55Z
EPSS history
Timeline
  • 10 AUG 13:55Z
    Issuer not verified from obtained token in user_oidc
    cvelistv5