bsv-blockchain wallet-toolbox prior 2.4.0 StorageClient data authenticity

Summaryinfo

A vulnerability was found in bsv-blockchain wallet-toolbox, wallet-toolbox-client and wallet-toolbox-mobile. It has been declared as problematic. The affected element is an unknown function of the component StorageClient. Such manipulation leads to data authenticity. This vulnerability is documented as CVE-2026-56744. The attack can be executed remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in bsv-blockchain wallet-toolbox, wallet-toolbox-client and wallet-toolbox-mobile. Affected by this issue is some unknown processing of the component StorageClient. The manipulation with an unknown input leads to a data authenticity vulnerability. Using CWE to declare the problem leads to CWE-345. The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data. Impacted is integrity. CVE summarizes:

`@bsv/wallet-toolbox` provides BRC-100 wallet signing and storage components, while `@bsv/wallet-toolbox-client` and `@bsv/wallet-toolbox-mobile` provide client-focused distributions for standard and mobile applications using wallet storage services. A vulnerability in these packages causes transactions created through a remote `StorageClient` to trust output locking scripts returned by the storage provider without verifying that they match the outputs requested by the caller. A malicious or compromised storage provider can substitute a recipient script or inject an additional output, causing the wallet to sign and broadcast a transaction that redirects funds while the application and user interface continue to display the intended recipient. Source and npm publication history indicate that stable versions `@bsv/wallet-toolbox` and `@bsv/wallet-toolbox-client` from 1.1.47 through 2.3.3, and `@bsv/wallet-toolbox-mobile` from its initial 1.3.21 release through 2.3.3, are affected. All three packages are patched in version 2.4.0. Applications unable to upgrade should avoid remote `StorageClient` providers, use local storage, or independently verify every transaction output’s locking script and value against the original request before signing

The advisory is available at github.com. This vulnerability is handled as CVE-2026-56744 since 06/22/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available.

Upgrading to version 2.4.0 eliminates this vulnerability.

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Productinfo

Vendor

• bsv-blockchain

Name

• wallet-toolbox
• wallet-toolbox-client
• wallet-toolbox-mobile

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