Token theft via nested-call allowlist bypass
Published May 15, 2025 · Updated May 19, 2025
Incorrect authorization in Alchemy Modular Account 2.0.0 allows remote authenticated users with a session key to transfer account tokens. The AllowlistModule prevalidation hook passes executeUserOp calldata to checkAllowlistCalldata without unwrapping the nested execute or executeBatch call, so the restricted selector and target are not checked. A granted session key can remove its restrictions, rotate higher-privilege keys, or transfer ERC-20 and ERC-721 tokens held by the account.
Summary
What happened
Incorrect authorization in Alchemy Modular Account 2.0.0 allows remote authenticated users with a session key to transfer account tokens. The AllowlistModule prevalidation hook passes executeUserOp calldata to checkAllowlistCalldata without unwrapping the nested execute or executeBatch call, so the restricted selector and target are not checked. A granted session key can remove its restrictions, rotate higher-privilege keys, or transfer ERC-20 and ERC-721 tokens held by the account.
The record
- CVE
- CVE-2025-46834
- Published
- May 15, 2025
- Updated
- May 19, 2025
- Vendor
- Alchemy
- Product
- Modular Account
- Classifications
- CWE-863, T1098
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- May 15, 2025CVE publishedPublication date reported by the CVE source.
- May 19, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion== 2.0.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
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Technologies
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Your stack
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