spacetime Ad Inserter Plugin up to 2.8.16 on WordPress Shortcode replace_ai_tags data authorization

Summaryinfo

A vulnerability was found in spacetime Ad Inserter Plugin up to 2.8.16 on WordPress. It has been classified as problematic. This affects the function replace_ai_tags of the component Shortcode Handler. This manipulation of the argument data causes authorization. This vulnerability is tracked as CVE-2026-11900. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in spacetime Ad Inserter Plugin up to 2.8.16 on WordPress and classified as problematic. Affected by this vulnerability is the function replace_ai_tags of the component Shortcode Handler. The manipulation of the argument data with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. As an impact it is known to affect confidentiality. The summary by CVE is:

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.

The weakness was disclosed by nightward. It is possible to read the advisory at wordfence.com. This vulnerability is known as CVE-2026-11900 since 06/10/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 2.8.13 eliminates this vulnerability.

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Productinfo

Type

• WordPress Plugin

Vendor

• spacetime

Name

• Ad Inserter Plugin

Version

• 2.8.0
• 2.8.1
• 2.8.2
• 2.8.3
• 2.8.4
• 2.8.5
• 2.8.6
• 2.8.7
• 2.8.8
• 2.8.9
• 2.8.10
• 2.8.11
• 2.8.12
• 2.8.13
• 2.8.14
• 2.8.15
• 2.8.16

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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Entryinfo

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