# CVE-2026-4336: Ultimate FAQ Accordion Plugin <= 2.4.7 - Authenticated (Author+) Stored Cross-Site Scripting via FAQ Content

> Authenticated Authors can inject arbitrary scripts into FAQ content via entity encoding, leading to stored XSS execution for site visitors.

- **Severity:** Medium 6.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 9 Apr 2026
- **Updated:** 9 Apr 2026
- **Also known as:** GHSA-xcgq-hf5p-j85h

## What is CVE-2026-4336?

CVE-2026-4336 is a medium-severity cross-site scripting vulnerability in rustaurius Ultimate FAQ Accordion Plugin, published on 9 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The Ultimate FAQ Accordion plugin for WordPress is vulnerable to Stored Cross-Site Scripting via FAQ content in all versions up to, and including, 2.4.7. This is due to the plugin calling html_entity_decode() on post_content during rendering in the set_display_variables() function (View.FAQ.class.php, line 746), which converts HTML entity-encoded payloads back into executable HTML, combined with insufficient output escaping in the faq-answer.php template where the decoded content is echoed without wp_kses_post() or any other sanitization. The ufaq custom post type is registered with 'show_in_rest' => true and defaults to 'post' capability_type, allowing Author-level users to create and publish FAQs via the REST API. An Author can submit entity-encoded malicious HTML (e.g., &lt;img src=x onerror=alert()&gt;) which bypasses WordPress's kses sanitization at save time (since kses sees entities as plain text, not tags), but is then decoded back into executable HTML by html_entity_decode() at render time. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts in FAQ pages that will execute whenever a user accesses an injected FAQ, either directly or via the [ultimate-faqs] shortcode.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-4336?


## How do I fix CVE-2026-4336?

No fix has been published for CVE-2026-4336 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-4336 being exploited?

There is no known exploitation of CVE-2026-4336 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4336 and fix it if it is affected.

What it is: CVE-2026-4336 is a medium-severity cross-site scripting vulnerability in rustaurius Ultimate FAQ Accordion Plugin, published on 9 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-4336 in the wild and no public exploit code.

Affected product: rustaurius Ultimate FAQ Accordion Plugin. 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-2026-4336/ (Markdown: https://insights.sbomify.com/CVE-2026-4336/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4336
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4336
- OSV: https://osv.dev/vulnerability/CVE-2026-4336

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-4336/
Summaries are generated and may contain mistakes; the official description above is the record.