# CVE-2026-39516: POSIMYTH Nexter Blocks sensitive data exposure in WordPress plugin

Source: https://junglewise.ai/threats/cve-2026-39516-posimyth-nexter-blocks-sensitive-data-exposure-in-wordpress  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-08. Updated: 2026-07-24  
License: CC BY 4.0 with a link back

CVE-2026-39516 · Severity: medium · CVSS 5.3 · Published 2026-04-08

Nexter Blocks is a popular WordPress plugin used to enhance the block editor with additional design elements. A vulnerability in versions up to 4.7.0 allows unauthorized individuals to access sensitive system information that should be restricted. This exposure could potentially reveal configuration details or other internal data, which attackers might use to facilitate further, more targeted attacks against the website.

Technologies: [POSIMYTH Innovations Nexter Blocks](https://junglewise.ai/threats/technologies/nexter-blocks). Vendors: [POSIMYTH Innovations](https://junglewise.ai/threats/vendors/posimyth-innovations).

## Quick answers

**Is CVE-2026-39516 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-39516 being exploited in the wild.

**How severe is CVE-2026-39516?** Medium severity, with a CVSS score of 5.3, published 8 April 2026.

**Which products and versions are affected?** POSIMYTH Innovations Nexter Blocks <= 4.7.0.

**Is there a fix for CVE-2026-39516?** A patch was published on 2026-04-08: Version 4.7.1 released to address the vulnerability Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-39516 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-39516?** Check whether you run POSIMYTH Innovations Nexter Blocks at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A 'Sensitive Data Exposure' vulnerability (CWE-497) exists in the POSIMYTH Nexter Blocks plugin (the-plus-addons-for-block-editor) for WordPress. The flaw allows an unauthenticated remote attacker to retrieve sensitive system information that is improperly exposed to an unauthorized control sphere. This occurs because the plugin fails to adequately restrict access to certain embedded data within the block editor environment. An attacker can exploit this by sending a crafted network request to the affected site, potentially gaining insights into the system configuration or other internal metadata. The issue is resolved in version 4.7.1.

## Affected products

- POSIMYTH Innovations Nexter Blocks (the-plus-addons-for-block-editor) <= 4.7.0

## Timeline

- 2026-02-24: disclosed: Reported by Bao - BlueRock
- 2026-03-26: advisory: Patchstack published advisory
- 2026-04-08: advisory: CVE published to NVD
- 2026-04-08: patched: Version 4.7.1 released to address the vulnerability

## References

- [https://wordpress.org/plugins](https://wordpress.org/plugins)
- [https://patchstack.com/database/Wordpress/Plugin/the-plus-addons-for-block-editor/vulnerability/wordpress-nexter-blocks-plugin-4-7-0-sensitive-data-exposure-vulnerability?_s_id=cve](https://patchstack.com/database/Wordpress/Plugin/the-plus-addons-for-block-editor/vulnerability/wordpress-nexter-blocks-plugin-4-7-0-sensitive-data-exposure-vulnerability?_s_id=cve)

## Related threats

- [POSIMYTH Nexter Blocks directory traversal in plus_name parameter](https://junglewise.ai/threats/cve-2026-15420-posimyth-nexter-blocks-directory-traversal-in-plus-name-parameter)
- [Nexter Blocks WordPress plugin Stored XSS in commentIcon parameter](https://junglewise.ai/threats/cve-2026-6740-nexter-blocks-wordpress-plugin-stored-xss-in-commenticon-parameter)