An access control issue in Argo CD allows unauthenticated attackers to enumerate existing applications. This vulnerability affects github.com/argoproj/argo-cd/v2 0.5.0 through 2.4.27, 2.5.0-rc1 through 2.5.15 and 2.6.0-rc1 through 2.6.6. This vulnerability also affects versions 0.5.0 through 2.6.0-rc5 of github.com/argoproj/argo-cd.
CWE-203 - Observable Discrepancy
The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not.