# CVE-2026-78527: GS Testimonial Slider PHP object injection in unserialize

Source: https://junglewise.ai/threats/cve-2026-78527-contributor-php-object-injection-in-gs-testimonial-slider-3-3-10  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-30. Updated: 2026-10-30  
License: CC BY 4.0 with a link back

CVE-2026-78527 · Severity: high · CVSS 8.8 · Published 2026-10-30

GS Testimonial Slider is a WordPress plugin that displays customer testimonials on websites. A PHP object injection vulnerability in versions 3.3.10 and earlier allows contributors to execute arbitrary code on the server, potentially compromising the entire website and any data it stores.

Vendors: [GS Plugins](https://junglewise.ai/threats/vendors/gs-plugins).

## Quick answers

**Is CVE-2026-78527 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-78527 being exploited in the wild.

**How severe is CVE-2026-78527?** High severity, with a CVSS score of 8.8, published 30 October 2026.

**Which products and versions are affected?** GS Plugins GS Testimonial Slider 3.3.10 and earlier.

**Is there a fix for CVE-2026-78527?** No fixed version is recorded yet. Until an official patch is released, apply a WAF rule to block PHP object injection attacks targeting the plugin, or restrict contributor-level access to trusted users only. 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-2026-78527 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-78527?** Check whether you run GS Plugins GS Testimonial Slider 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.

## How to fix


Until an official patch is released, apply a WAF rule to block PHP object injection attacks targeting the plugin, or restrict contributor-level access to trusted users only.

## Technical details

A PHP object injection vulnerability exists in GS Testimonial Slider due to unsafe deserialization of user-controlled input. An attacker with contributor-level privileges can craft malicious serialized objects to trigger arbitrary code execution on the server. No official patch is currently available.

## Affected products

- GS Plugins GS Testimonial Slider 3.3.10 and earlier

## Timeline

- 2026-10-30: disclosed

## References

- [https://wordpress.org/plugins](https://wordpress.org/plugins)
- [https://patchstack.com/database/wordpress/plugin/gs-testimonial/vulnerability/wordpress-gs-testimonial-slider-plugin-3-3-10-php-object-injection-vulnerability?_s_id=cve](https://patchstack.com/database/wordpress/plugin/gs-testimonial/vulnerability/wordpress-gs-testimonial-slider-plugin-3-3-10-php-object-injection-vulnerability?_s_id=cve)