WordPress security changelog
MEDIUM CVE-2026-11900 Deferred

Ad Inserter – Ad Manager & AdSense Ads: A security weakness

Ad Inserter – Ad Manager & AdSense Ads is affected by a security weakness. Exploitation requires at least contributor-level access. The resulting impact depends on how the affected component exposes the vulnerable operation. The published affected range is <= 2.8.16.

CVE / CNA score 4.3 CVSS 3.1 · security@wordfence.com
NVD score Pending NVD has not published its own CVSS assessment.
Component
Ad Inserter – Ad Manager & AdSense Ads
Plugin slug
ad-inserter
Affected
<= 2.8.16
Safe version
> 2.8.16
Published
Jul 03, 2026
Weakness
CWE-639 — Authorization Bypass Through User-Controlled Key

This CVE was published Jul 03, 2026 and is one of 13 known issues for this plugin.

What to do

Update, patch or deactivate.

Update Ad Inserter – Ad Manager & AdSense Ads to a release after 2.8.16, or disable and remove it until a fixed version is available.

A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.

Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.

Source record

Technical description

The Ad Inserter – Ad Manager & AdSense Ads plugin for WordPress is vulnerable to Insecure Direct Object Reference in versions up to and including 2.8.16 via the 'data' attribute of the [adinserter] shortcode. This is due to the replace_ai_tags() function processing a {reusable-block-N} tag pattern that calls get_post_field('post_content', N) without verifying the requesting user's capability with current_user_can('read_post'), without restricting the post type to 'wp_block', and without checking the post status. This makes it possible for authenticated attackers, with Contributor-level access and above, to read the full content of arbitrary posts including Private, Draft, Pending, Trashed, and password-protected posts owned by other users, by placing the shortcode in a post they own and previewing it.

CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References

Primary and upstream sources