CVE-2025-46834 Alchemy's Modular Account can use executeUserOp to bypass allowlist prevalidation hook
Session keys can bypass allowlist restrictions to transfer tokens or modify permissions in Alchemy's Modular Account smart contract.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-46834?
CVE-2025-46834 is a medium-severity authentication bypass vulnerability in alchemyplatform modular-account, published on 15 May 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-863
Which versions are affected by CVE-2025-46834?
How do I fix CVE-2025-46834?
No fix has been published for CVE-2025-46834 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2025-46834 being exploited?
There is no known exploitation of CVE-2025-46834 in the wild and no public exploit code.
Sources
Also known as GHSA-jhp7-7cq9-m4pv.