# CVE-2026-57743: stmcan RT-Theme 18 Extensions local file inclusion

Source: https://junglewise.ai/threats/cve-2026-57743-stmcan-rt-theme-18-extensions-local-file-inclusion  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-13. Updated: 2026-07-13  
License: CC BY 4.0 with a link back

CVE-2026-57743 · Severity: high · CVSS 8.1 · Published 2026-07-13

A security vulnerability exists in the RT-Theme 18 Extensions plugin for WordPress, which is used to add functionality to websites using the RT-Theme 18 template. An attacker can exploit this flaw to view sensitive internal files on the web server, such as configuration files containing database passwords. This could lead to a full compromise of the website's data and underlying server.

Technologies: [Stmcan RT-Theme 18 Extensions](https://junglewise.ai/threats/technologies/rt-theme-18-extensions). Vendors: [Stmcan](https://junglewise.ai/threats/vendors/stmcan).

## Quick answers

**Is CVE-2026-57743 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-57743 being exploited in the wild.

**How severe is CVE-2026-57743?** High severity, with a CVSS score of 8.1, published 13 July 2026.

**Which products and versions are affected?** stmcan RT-Theme 18 | Extensions (rt18-extensions) <= 2.5.

**Is there a fix for CVE-2026-57743?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-57743 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-57743?** Check whether you run Stmcan RT-Theme 18 Extensions. 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 Local File Inclusion (LFI) vulnerability exists in the stmcan RT-Theme 18 | Extensions (rt18-extensions) plugin for WordPress through version 2.5. The flaw stems from improper validation of user-supplied input used in PHP include or require statements (CWE-98). An unauthenticated remote attacker can exploit this by submitting specially crafted requests to include and execute local files on the server. Successful exploitation could allow the attacker to read sensitive files (like wp-config.php) or potentially achieve remote code execution if they can upload or influence the contents of a local file. As of the advisory date, no official patch is available.

## Affected products

- stmcan RT-Theme 18 | Extensions (rt18-extensions) <= 2.5

## Timeline

- 2026-01-31: disclosed: Reported by Bonds to Patchstack
- 2026-07-06: advisory: Patchstack published advisory and mitigation rules
- 2026-07-13: advisory: CVE published to NVD dataset

## References

- [https://wordpress.org/plugins](https://wordpress.org/plugins)
- [https://patchstack.com/database/Wordpress/Plugin/rt18-extensions/vulnerability/wordpress-rt-theme-18-extensions-plugin-2-5-local-file-inclusion-vulnerability?_s_id=cve](https://patchstack.com/database/Wordpress/Plugin/rt18-extensions/vulnerability/wordpress-rt-theme-18-extensions-plugin-2-5-local-file-inclusion-vulnerability?_s_id=cve)

## Related threats

- [stmcan RT-Theme 18 Extensions Reflected XSS](https://junglewise.ai/threats/cve-2026-57745-stmcan-rt-theme-18-extensions-reflected-xss)
- [stmcan RT-Theme 18 Extensions PHP object injection](https://junglewise.ai/threats/cve-2026-57744-stmcan-rt-theme-18-extensions-php-object-injection)
- [stmcan RT-Theme 18 Extensions Sensitive Data Exposure](https://junglewise.ai/threats/cve-2026-39711-stmcan-rt-theme-18-extensions-sensitive-data-exposure)
- [stmcan RT-Theme 18 Extensions CSRF](https://junglewise.ai/threats/cve-2026-39710-stmcan-rt-theme-18-extensions-csrf)