# CVE-2026-40783: Creative Themes Blocksy Companion Pro remote code execution

Source: https://junglewise.ai/threats/cve-2026-40783-creative-themes-blocksy-companion-pro-remote-code-execution  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-17. Updated: 2026-06-17  
License: CC BY 4.0 with a link back

CVE-2026-40783 · Severity: critical · CVSS 9.9 · Published 2026-06-17

Blocksy Companion Pro is a premium WordPress plugin used to extend the functionality of the Blocksy theme. A security vulnerability allows users with 'Contributor' level access to execute arbitrary code on the website's server. This could lead to a complete takeover of the site, data theft, or the installation of persistent backdoors.

Technologies: [Creative Themes Blocksy Companion Pro](https://junglewise.ai/threats/technologies/blocksy-companion-pro). Vendors: [Creative Themes](https://junglewise.ai/threats/vendors/creative-themes).

## Quick answers

**Is CVE-2026-40783 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-40783 being exploited in the wild.

**How severe is CVE-2026-40783?** Critical severity, with a CVSS score of 9.9, published 17 June 2026.

**Which products and versions are affected?** Creative Themes Blocksy Companion Pro <= 2.1.37.

**Is there a fix for CVE-2026-40783?** A patch was published on 2026-06-17: Patch confirmed available in version 2.1.38 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-40783 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-40783?** Check whether you run Creative Themes Blocksy Companion Pro 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 Remote Code Execution (RCE) vulnerability exists in the Blocksy Companion Pro plugin for WordPress due to improper control of code generation (CWE-94). The flaw allows an authenticated attacker with at least 'Contributor' privileges to inject and execute arbitrary PHP code on the server. The vulnerability is assigned a CVSS score of 9.9 because it allows for a total impact on confidentiality, integrity, and availability, and can lead to a full site compromise. The issue is resolved in version 2.1.38.

## Affected products

- Creative Themes Blocksy Companion Pro <= 2.1.37

## Timeline

- 2026-03-13: other: Reported by Nguyen Ba Khanh
- 2026-04-22: disclosed: Initial disclosure by Patchstack
- 2026-06-17: advisory: NVD publication date
- 2026-06-17: patched: Patch confirmed available in version 2.1.38

## References

- [https://wordpress.org/plugins](https://wordpress.org/plugins)
- [https://patchstack.com/database/wordpress/plugin/blocksy-companion-pro/vulnerability/wordpress-blocksy-companion-pro-plugin-2-1-37-remote-code-execution-rce-vulnerability?_s_id=cve](https://patchstack.com/database/wordpress/plugin/blocksy-companion-pro/vulnerability/wordpress-blocksy-companion-pro-plugin-2-1-37-remote-code-execution-rce-vulnerability?_s_id=cve)

## Related threats

- [Creative Themes Blocksy Companion Pro unauthenticated RCE](https://junglewise.ai/threats/cve-2026-57624-creative-themes-blocksy-companion-pro-unauthenticated-rce)
- [Creative Themes Blocksy Companion Pro IDOR vulnerability](https://junglewise.ai/threats/cve-2026-57630-creative-themes-blocksy-companion-pro-idor-vulnerability)
- [Creative Themes Blocksy Companion Pro remote code execution](https://junglewise.ai/threats/cve-2026-57315-creative-themes-blocksy-companion-pro-remote-code-execution)
- [Creative Themes Blocksy Companion Pro SQL injection](https://junglewise.ai/threats/cve-2026-39596-creative-themes-blocksy-companion-pro-sql-injection)