Ad Inserter: Subscriber-level stored PHP execution
Ad Inserter 2.8.12 through versions before 2.8.19 makes a settings page accessible to every logged-in user under a configuration permitted by its own settings and fails to filter saved content. A Subscriber or higher can store code that is later executed as PHP or served unescaped to site visitors. The settings-page route, option enabling access, input fields and execution function are unspecified. Exploitability is conditional on that access configuration, not established for the default setup.
- Component
- Ad Inserter
- Plugin slug
ad-inserter- Affected
- 2.8.12 to < 2.8.19
- Safe version
2.8.19- Published
- Sep 27, 2026
This CVE was published Sep 27, 2026 and is one of 17 known issues for this plugin.
Update, patch or deactivate.
Update to 2.8.19 or a later supported release. Restrict access to code-bearing settings to trusted administrators and independently authorize every save operation. Do not allow lower-privileged input into PHP execution or unescaped page output. Review saved ad/code blocks for unauthorized content and assess compromise if unexpected PHP is present.
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.
Technical description
The Ad Inserter WordPress plugin before 2.8.19 does not correctly restrict access to one of its settings pages, making it reachable by every logged in user under a configuration its own settings allow, and does not filter the content saved there, allowing users with a role as low as subscriber to store code which is then executed as PHP or served unescaped to site visitors.
CVE / CNA vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H