Is CVE-2023-43656 actively exploited?

No active exploitation of CVE-2023-43656 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-43656 be exploited remotely?

Yes. CVE-2023-43656 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-43656?

CVE-2023-43656 has a CVSS score of 9.0 (CRITICAL).

HOME VULNERABILITIESCVE-2023-43656

CRITICAL

CVE-2023-43656

CWE-74Published: September 27, 2023· Updated: Jun 17, 2026

9.0

CVSS v3.1

Official Description

matrix-hookshot is a Matrix bot for connecting to external services like GitHub, GitLab, JIRA, and more. Instances that have enabled transformation functions (those that have `generic.allowJsTransformationFunctions` in their config), may be vulnerable to an attack where it is possible to break out of the `vm2` sandbox and as a result Hookshot will be vulnerable to this. This problem is only likely to affect users who have allowed untrusted users to apply their own transformation functions. If you have only enabled a limited set of trusted users, this threat is reduced (though not eliminated). Version 4.5.0 and above of hookshot include a new sandbox library which should better protect users. Users are advised to upgrade. Users unable to upgrade should disable `generic.allowJsTransformationFunctions` in the config.

NVD Source

Technical Analysis

CVE-2023-43656 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.0.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.