Cross-site Scripting for Argo CD single sign on users

Summary

Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes. Argo CD starting with 2.3.0 and prior to 2.3.6 and 2.4.5 is vulnerable to a cross-site scripting (XSS) bug which could allow an attacker to inject arbitrary JavaScript in the `/auth/callback` page in a victim's browser. This vulnerability only affects Argo CD instances which have single sign on (SSO) enabled. The exploit also assumes the attacker has 1) access to the API server's encryption key, 2) a method to add a cookie to the victim's browser, and 3) the ability to convince the victim to visit a malicious `/auth/callback` link. The vulnerability is classified as low severity because access to the API server's encryption key already grants a high level of access. Exploiting the XSS would allow the attacker to impersonate the victim, but would not grant any privileges which the attacker could not otherwise gain using the encryption key. A patch for this vulnerability has been released in the following Argo CD versions 2.4.5 and 2.3.6. There is currently no known workaround.

Timeline

1. Jul 12, 2022, 10:05 PM UTCCVE published
2. Apr 23, 2025, 2:03 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Apr 23, 2025, 6:02 PM UTCRecord last updated

Affected versions

• argoproj argo-cd

  From 2.3.0 · fixed in 2.3.6; From 2.4.0 · fixed in 2.4.5

• github.com/argoproj/argo-cdGo

  All versions

• github.com/argoproj/argo-cd/v2Go

  From 2.3.0 · fixed in 2.3.6; From 2.4.0 · fixed in 2.4.5

• github.com/argoproj/argo-cdGo

  From 2.3.0 · fixed in 2.3.6

• github.com/argoproj/argo-cdGo

  From 2.4.0 · fixed in 2.4.5

References 3