Nextcloud User Saml is an app for authenticating Nextcloud users using SAML. In affected versions users can be given a link to the Nextcloud server and end up on a uncontrolled thirdparty server. It is recommended that the User Saml app is upgraded to version 5.1.5, 5.2.5, or 6.0.1. There are no known workarounds for this issue.
The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.
Link | Tags |
---|---|
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-622q-xhfr-xmv7 | vendor advisory |
https://github.com/nextcloud/user_saml/pull/788 | patch |
https://github.com/nextcloud/user_saml/commit/b184304a476deeba36e92b70562d5de7c2f85f8a | patch |
https://hackerone.com/reports/2263044 | third party advisory permissions required |