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.
References (3)
Core 3
Core References
Patch, Vendor Advisory x_refsource_confirm
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xx3h-v363-q36j
Patch x_refsource_misc
https://github.com/nextcloud/user_oidc/pull/642
Permissions Required x_refsource_misc
https://hackerone.com/reports/2021684
Scores
CVSS v3
4.8
EPSS
0.0045
EPSS Percentile
35.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-303
Status
published
Products (1)
nextcloud/user_oidc
1.0.0 - 1.3.3
Published
Aug 10, 2023
Tracked Since
Feb 18, 2026