Naufal Septiadi

**Name of the Vulnerable Software and Affected Versions** Argo CD versions prior to 2.3.4 Argo CD versions prior to 2.2.9 Argo CD versions prior to 2.1.15 **Description** A vulnerability was found in Argo CD that allows an attacker to spoof error messages on the login screen when single sign on (SSO) is enabled. In order to exploit this vulnerability, an attacker would have to trick the victim to visit a specially crafted URL which contains the message to be displayed. As far as the research of the Argo CD team concluded, it is not possible to specify any active content (e.g. Javascript) or other HTML fragments (e.g. clickable links) in the spoofed message. **Recommendations** Update to Argo CD version 2.3.4 or later Update to Argo CD version 2.2.9 or later Update to Argo CD version 2.1.15 or later As a temporary workaround, consider restricting access to the login screen when SSO is enabled until a patch is applied.