# CVE-2026-103354: Kadence Blocks stored cross-site scripting

Source: https://junglewise.ai/threats/cve-2026-103354-improper-neutralization-of-input-during-web-page-generation  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-04. Updated: 2026-10-05  
License: CC BY 4.0 with a link back

CVE-2026-103354 · Severity: high · CVSS 7.1 · Published 2026-10-04

Kadence Blocks is a WordPress plugin that provides Gutenberg block editing functionality for page building. A stored cross-site scripting vulnerability allows unauthenticated attackers to inject malicious scripts that persist in the site, potentially stealing visitor data or hijacking accounts when the content is viewed.

Vendors: [Liquid Web / StellarWP](https://junglewise.ai/threats/vendors/liquid-web-stellarwp).

## Quick answers

**Is CVE-2026-103354 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-103354 being exploited in the wild.

**How severe is CVE-2026-103354?** High severity, with a CVSS score of 7.1, published 4 October 2026.

**Which products and versions are affected?** Liquid Web / StellarWP Kadence Blocks through 3.7.11.1.

**Is there a fix for CVE-2026-103354?** Yes: fixed in 3.7.12. Until then: Patchstack has issued a mitigation rule to block attacks on vulnerable installations until the plugin is updated. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-103354 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-103354?** Check whether you run Liquid Web / StellarWP Kadence 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.

## How to fix

- Fixed in 3.7.12

Patchstack has issued a mitigation rule to block attacks on vulnerable installations until the plugin is updated.

## Technical details

The plugin fails to properly neutralize user input during web page generation, allowing storage of arbitrary JavaScript code. An unauthenticated attacker can inject malicious scripts through plugin blocks, which execute in the context of visitor browsers. The vulnerability requires a privileged user to add affected block content (such as through a malicious link or form), but once stored, affects all site visitors.

## Affected products

- Liquid Web / StellarWP Kadence Blocks through 3.7.11.1

## Timeline

- 2026-10-04: disclosed
- 2026-09-23: reported

## References

- [https://wordpress.org/plugins](https://wordpress.org/plugins)
- [https://patchstack.com/database/wordpress/plugin/kadence-blocks/vulnerability/wordpress-gutenberg-blocks-by-kadence-blocks-plugin-3-7-11-1-cross-site-scripting-xss-vulnerability?_s_id=cve](https://patchstack.com/database/wordpress/plugin/kadence-blocks/vulnerability/wordpress-gutenberg-blocks-by-kadence-blocks-plugin-3-7-11-1-cross-site-scripting-xss-vulnerability?_s_id=cve)

## Related threats

- [Kadence Blocks stored cross-site scripting vulnerability](https://junglewise.ai/threats/cve-2026-115602-improper-neutralization-of-input-during-web-page-generation)