Strategic Overview
- Status
- Patched in 4.1.1
- Affected Plugin
- Custom Block Builder – Lazy Blocks
- Affected Version
<= 4.1.0- CVSS
- 4.3Medium
- Weakness type
- CWE-862 · Missing Authorization
- CVE
CVE-2025-58258
At a glance
CVE-2025-58258 is a medium-severity Missing Authorization vulnerability in the Custom Block Builder WordPress plugin, affecting versions <= 4.1.0. It carries a CVSS score of 4.3 (reachable over the network; low attack complexity). The root cause is a missing authorization check on a reachable function. The issue is fixed in version 4.1.1; sites on affected versions should update now. Disclosed September 2025, reported by MD ISMAIL.
Vulnerability Overview
The Lazy Blocks plugin for WordPress is vulnerable to unauthorized access of data due to a missing capability check on the maybe_export_json() function in versions up to, and including, 4.1.0. This makes it possible for authenticated attackers, with contributor-level access and above, to export block data.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user.
CWE-862: Missing Authorization
Custom Block Builder <= 4.1.0 carries this weakness at maybe_export_json(), and reaching it takes a caller who can reach the endpoint. A missing authorization check means a function is reachable by anyone who can reach the endpoint, because the code never asks whether the caller is allowed to perform the action.
Any user who can reach the endpoint gets to run an action reserved for higher-privileged roles, from reading protected data to changing settings or content. For Custom Block Builder the fix is 4.1.1: builds <= 4.1.0 are affected, anything from 4.1.1 onward is not.
Remediation
Update to version 4.1.1, or a newer patched version
How does WordSec protect against this?
Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: Custom Block Builder 4.1.1 closes this, and updating the plugin is the step that ends it.
- Login Security
- Alerts
External References
Related records
Other vulnerabilities in Custom Block Builder – Lazy Blocks
Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C