CVE-2026-11900 Information disclosure in Ad Inserter – Ad Manager & AdSense Ads
Authenticated contributors can read arbitrary private or draft post content via an insecure shortcode attribute in the Ad Inserter plugin.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-11900?
CVE-2026-11900 is a medium-severity vulnerability in spacetime Ad Inserter – Ad Manager & AdSense Ads, published on 3 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-639
Which versions are affected by CVE-2026-11900?
How do I fix CVE-2026-11900?
No fix has been published for CVE-2026-11900 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-11900 being exploited?
There is no known exploitation of CVE-2026-11900 in the wild and no public exploit code.
Sources
Also known as GHSA-ppgc-36hr-q23g.