Fixed in v1.5.1, Argo version v1.5.0 was vulnerable to a user-enumeration vulnerability which allowed attackers to determine the usernames of valid (non-SSO) accounts because /api/v1/session returned 401 for an existing username and 404 otherwise.
github.com/argoproj/argo-cd/util/session github.com/argoproj/argo-cd/server/session
{
"github_reviewed": true,
"severity": "MODERATE",
"nvd_published_at": "2020-04-08T18:15:00Z",
"cwe_ids": [
"CWE-203"
],
"github_reviewed_at": "2021-05-25T18:19:26Z"
}