Ad Inserter <= 2.8.16 - Insecure Direct Object Reference to Authenticated (Contributor+) Arbitrary Post Content Disclosure via 'data' Shortcode Attribute
Summary
| CVE | CVE-2026-11900 |
|---|---|
| State | PUBLISHED |
| Assigner | Wordfence |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-07-03 09:16:36 UTC |
| Updated | 2026-07-03 09:16:36 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 4.3 MEDIUM from [email protected]
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Problem Types: CWE-639 | CWE-639 CWE-639 Authorization Bypass Through User-Controlled Key
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 4.3 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
| 3.1 | CNA | DECLARED | 4.3 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
LowIntegrity
NoneAvailability
NoneCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Spacetime | Ad Inserter Ad Manager AdSense Ads | affected 2.8.16 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.13/ad-inserter.php | [email protected] | plugins.trac.wordpress.org | |
| www.wordfence.com/threat-intel/vulnerabilities/id/20f0e9ae-786b-4ba8-a6d5-92bf3... | [email protected] | www.wordfence.com | |
| plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.16/ad-inserter.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.16/ad-inserter.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/changeset | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.13/ad-inserter.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.16/ad-inserter.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.13/ad-inserter.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.13/ad-inserter.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.16/ad-inserter.php | [email protected] | plugins.trac.wordpress.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: nightward (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-06-10T15:58:36.000Z | Vendor Notified |
| CNA | 2026-07-02T19:01:12.000Z | Disclosed |
There are currently no legacy QID mappings associated with this CVE.