CVE-2026-11983: Ad Inserter <= 2.8.16 - Missing Authorization to Block Visibility Bypass via ai_ajax

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-06 · updated 2026-08-12
Weakness: CWE-862

Description

The Ad Inserter – Ad Manager & AdSense Ads plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 2.8.16 due to a missing capability check in the `ai_ajax` function. This makes it possible for unauthenticated attackers to view the contents of ad blocks that an administrator has restricted to administrator-only visibility.

Affected products

spacetime Ad Inserter – Ad Manager & AdSense Ads: through 2.8.16

References

https://plugins.trac.wordpress.org/changeset/3567905
https://plugins.trac.wordpress.org/changeset/3583409
https://www.wordfence.com/threat-intel/vulnerabilities/id/b5715acd-62e6-4cd8-8fe8-4b1412f287c9?source=cve

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