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GHSA-g2fm-8hr4-j82h
easycorp/easyadmin-bundleeasycorp/easyadmin-bundleSummary
EasyAdmin serves all backend requests through a single dashboard route and, for custom actions (Action::linkToRoute() / MenuItem::linkToRoute()), swaps the executed controller based on the routeName query parameter on the kernel.controller event.
That swap happens after Symfony's security firewall has already evaluated access_control against the original dashboard URL, and the routeName value was not validated. As a result, a path-based access_control rule protecting the target route was never evaluated, so a low-privilege backend user could reach a more restricted route by name.
Impact
Any application where access_control (or another path-based Symfony security rule) protects some routes more strictly than the dashboard URL used to reach EasyAdmin. An attacker who can reach a single EasyAdmin URL and knows a target route's name can execute that route's controller, bypassing the path-based rule.
Only path-based protections are bypassed. Routes whose controller enforces its own authorization with #[IsGranted] / denyAccessUnlessGranted() remain protected, because those checks are recomputed against the swapped-in controller.
Patches
Fixed in 4.29.16 and 5.5.1. Before dispatching a custom-action route, EasyAdmin now re-evaluates the target route's access_control rule and denies the request if the current user is not granted access.
Workarounds
Add controller-level authorization (#[IsGranted] / denyAccessUnlessGranted()) to any sensitive route, since controller-level checks are still enforced. Upgrading is the recommended fix.
Credits
Reported by @TungNGo02.
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The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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