alchemyplatform modular-account 2.0.0 authorization

Summaryinfo

A vulnerability was found in alchemyplatform modular-account 2.0.0. It has been classified as problematic. The affected element is an unknown function. This manipulation causes authorization. The identification of this vulnerability is CVE-2025-46834. It is possible to initiate the attack remotely. There is no exploit available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability was found in alchemyplatform modular-account 2.0.0. It has been declared as problematic. Affected by this vulnerability is an unknown code block. The manipulation with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-863. The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions. As an impact it is known to affect integrity. The summary by CVE is:

Alchemy's Modular Account is a smart contract account that is compatible with ERC-4337 and ERC-6900. In versions on the 2.x branch prior to commit 5e6f540d249afcaeaf76ab95517d0359fde883b0, owners of Modular Accounts can grant session keys (scoped external keys) to external parties and would use the allowlist module to restrict which external contracts can be accessed by the session key. There is a bug in the allowlist module in that we don't check for the `executeUserOp` -> `execute` or `executeBatch` path, effectively allowing any session key to bypass any access control restrictions set on the session key. Session keys are able to access ERC20 and ERC721 token contracts amongst others, transferring all tokens from the account out andonfigure the permissions on external modules on session keys. They would be able to remove all restrictions set on themselves this way, or rotate the keys of other keys with higher privileges into keys that they control. Commit 5e6f540d249afcaeaf76ab95517d0359fde883b0 fixes this issue.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2025-46834 since 04/30/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

Applying the patch 5e6f540d249afcaeaf76ab95517d0359fde883b0 is able to eliminate this problem. The bugfix is ready for download at github.com.

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Productinfo

Vendor

• alchemyplatform

Name

• modular-account

Version

• 2.0.0

License

• open-source

Website

• Product: https://github.com/alchemyplatform/modular-account/

CPE 2.3info

• 🔍

CPE 2.2info

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