# CVE-2026-11900: Ad Inserter IDOR in replace_ai_tags function

Source: https://junglewise.ai/threats/cve-2026-11900-ad-inserter-idor-in-replace-ai-tags-function  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-03. Updated: 2026-07-03  
License: CC BY 4.0 with a link back

CVE-2026-11900 · Severity: medium · CVSS 4.3 · Published 2026-07-03

The Ad Inserter plugin for WordPress, which is used to manage and display advertisements, contains a security flaw that allows certain users to view restricted content. Authenticated users with at least Contributor-level access can exploit this to read private, draft, or password-protected posts created by other authors. This could lead to the unauthorized disclosure of sensitive information or unpublished site content.

Technologies: [Igor Funa Ad Inserter](https://junglewise.ai/threats/technologies/ad-inserter). Vendors: [Igor Funa](https://junglewise.ai/threats/vendors/igor-funa).

## Quick answers

**Is CVE-2026-11900 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-11900 being exploited in the wild.

**How severe is CVE-2026-11900?** Medium severity, with a CVSS score of 4.3, published 3 July 2026.

**Which products and versions are affected?** Igor Funa Ad Inserter up to and including 2.8.16.

**Is there a fix for CVE-2026-11900?** 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-2026-11900 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-11900?** Check whether you run Igor Funa Ad Inserter 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

The vulnerability is an Insecure Direct Object Reference (IDOR) located in the replace_ai_tags() function of the Ad Inserter plugin. The function processes a {reusable-block-N} tag pattern by calling get_post_field('post_content', N) without implementing proper authorization checks such as current_user_can('read_post'). Additionally, the plugin fails to restrict the post type to 'wp_block' or verify the post status. An authenticated attacker with Contributor-level permissions can exploit this by placing a crafted shortcode in a post they control and previewing it to retrieve the content of any post ID. A patch was released in version 2.8.17.

## Affected products

- spacetime Ad Inserter – Ad Manager & AdSense Ads up to and including 2.8.16

## Timeline

- 2026-07-03: advisory: NVD publication date

## References

- [https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.13/ad-inserter.php](https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.13/ad-inserter.php)
- [https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.13/ad-inserter.php](https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.13/ad-inserter.php)
- [https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.13/ad-inserter.php](https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.13/ad-inserter.php)
- [https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.13/ad-inserter.php](https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.13/ad-inserter.php)
- [https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.16/ad-inserter.php](https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.16/ad-inserter.php)
- [https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.16/ad-inserter.php](https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.16/ad-inserter.php)
- [https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.16/ad-inserter.php](https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.16/ad-inserter.php)

## Related threats

- [Igor Funa Ad Inserter XSS in content injection](https://junglewise.ai/threats/cve-2026-124262-improper-neutralization-of-script-related-html-tags-in-a-web)
- [Ad Inserter cross-site scripting in plugin](https://junglewise.ai/threats/cve-2026-105077-unauthenticated-cross-site-scripting-xss-in-ad-inserter-2-8-19)
- [Igor Funa Ad Inserter stored cross-site scripting](https://junglewise.ai/threats/cve-2026-118094-improper-neutralization-of-input-during-web-page-generation)
- [Igor Funa Ad Inserter reflected cross-site scripting](https://junglewise.ai/threats/cve-2026-114709-improper-neutralization-of-input-during-web-page-generation)
- [Igor Funa Ad Inserter reflected XSS in plugin settings](https://junglewise.ai/threats/cve-2026-114194-improper-neutralization-of-input-during-web-page-generation)