EUVD-2026-87886
GHSA-8f3r-fqj2-gfj6
Severity by source
AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
PR:L for subscriber role and AC:H because a specific non-default settings configuration must be enabled; PHP code execution yields full C/I/A:H, scope unchanged as execution stays within the host application.
Primary rating from Vendor (WPScan).
CVSS VectorVendor: WPScan
Lifecycle Timeline
5DescriptionCVE.org
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.
Articles & Coverage 2
AnalysisAI
Stored code injection in the Ad Inserter WordPress plugin before 2.8.19 allows an authenticated user with a role as low as subscriber to save content that the plugin then executes as PHP or serves unescaped to site visitors, because one of the plugin's settings pages is not access-restricted and the data written there is not filtered. Exploitation is conditional rather than trivial: the threat actor needs a low-privileged account (easy on sites with open registration) and the site must be running a configuration in which the plugin's own settings make that page reachable by every logged-in user, which is why the assessed vector is CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H with total technical impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires two conditions: (1) an authenticated account with a role as low as subscriber (PR:L), which is trivially obtainable on sites with open registration; and (2) a non-default plugin configuration - the settings-page access restriction must be relaxed such that the page is 'reachable by every logged in user under a configuration its own settings allow' (this maps to AC:H). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are internally consistent but point to a real-but-conditional priority rather than an emergency. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: 2.8.19 - upgrade the Ad Inserter plugin to 2.8.19 or later from the WordPress plugin repository or the vendor's distribution channel; because the fix is a plugin-version bump, it can be applied in-place on affected sites, and the WPScan advisory at https://wpscan.com/vulnerability/b189ce9a-a930-41e6-bdd1-fdcc3bfb66be/ should be used to confirm the exact fixed version. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all WordPress installations for the Ad Inserter plugin and confirm any instance below version 2.8.19; update those instances to Ad Inserter 2.8.19 or later immediately, or deactivate the plugin if patching cannot be completed, and temporarily restrict the plugin's settings pages to administrator roles, disable open subscriber registration if not business-critical, and review recent posts, settings, and logs for injected PHP or unescaped content tied to CVE-2026-81655. …
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External POC / Exploit Code
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