CVE-2024-52512: Nextcloud User OIDC has an open redirection when logging in with User OIDC

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-11-15 · updated 2026-06-17
Weakness: CWE-601

Description

user_oidc app is an OpenID Connect user backend for Nextcloud. A malicious user could send a malformed login link that would redirect the user to a provided URL after successfully authenticating. It is recommended that the Nextcloud User OIDC app is upgraded to 6.1.0.

Affected products

nextcloud User Oidc: from 6.0.0 before 6.1.0 — fixed in 6.1.0

How to fix

Upgrade to a fixed version: nextcloud User Oidc 6.1.0. Check the vendor advisory for mitigations.

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-784j-x2g5-4g7q
https://github.com/nextcloud/user_oidc/commit/c923428d51972f6d04636c6accbecdec0c1b88e9
https://github.com/nextcloud/user_oidc/pull/961
https://hackerone.com/reports/2720030

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