CVE-2026-81655 Ad Inserter 2.8.12 - 2.8.18 - Subscriber+ RCE / Stored XSS via Global Custom Fields
High 7.5
Published
Updated
Check this codebase for CVE-2026-81655 and fix it if it is affected.
What it is: CVE-2026-81655 is a high-severity vulnerability in Unknown Ad Inserter, published on 27 Sep 2026.
Exploitation: There is no known exploitation of CVE-2026-81655 in the wild and no public exploit code.
Affected product: Unknown Ad Inserter. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-81655/ (Markdown: https://insights.sbomify.com/CVE-2026-81655/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-81655?
CVE-2026-81655 is a high-severity vulnerability in Unknown Ad Inserter, published on 27 Sep 2026.
Official 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.
Weakness: CWE-94
Which versions are affected by CVE-2026-81655?
How do I fix CVE-2026-81655?
No fix has been published for CVE-2026-81655 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-81655 being exploited?
There is no known exploitation of CVE-2026-81655 in the wild and no public exploit code.
Sources
Also known as GHSA-8f3r-fqj2-gfj6.