Vulnerability Details CVE-2022-39338
user_oidc is an OpenID Connect user backend for Nextcloud. Versions prior to 1.2.1 did not properly validate discovery urls which may lead to a stored cross site scripting attack vector. The impact is limited due to the restrictive CSP that is applied on this endpoint. Additionally this vulnerability has only been shown to be exploitable in the Safari web browser. This issue has been addressed in version 1.2.1. Users are advised to upgrade. Users unable to upgrade should urge their users to avoid using the Safari web browser.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 32.2%
CVSS Severity
CVSS v3 Score 3.5
References
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-5fpw-795h-rg57
- https://github.com/nextcloud/user_oidc/pull/496
- https://hackerone.com/reports/1687410
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-5fpw-795h-rg57
- https://github.com/nextcloud/user_oidc/pull/496
- https://hackerone.com/reports/1687410
Products affected by CVE-2022-39338
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cpe:2.3:a:nextcloud:openid_connect_user_backend:*