# CVE-2026-9134: Cross-site scripting in Photo Gallery by FooGallery : Responsive Image Gallery, Masonry Gallery & Carousel

> Authenticated contributors can inject arbitrary scripts via shortcode parameters, leading to stored XSS execution for other users.

- **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:** 13 Jun 2026
- **Updated:** 15 Jun 2026
- **Also known as:** GHSA-fq2x-2hqx-f6x7

## What is CVE-2026-9134?

CVE-2026-9134 is a medium-severity cross-site scripting vulnerability in fooplugins Photo Gallery by FooGallery : Responsive Image Gallery, Masonry Gallery & Carousel, published on 13 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The FooGallery plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'custom_attribute_key' shortcode parameter in versions up to, and including, 3.1.31 This is due to an incomplete JavaScript event handler blacklist in the foogallery_sanitize_javascript() function, which blocks only a subset of HTML event attributes (onmouseover, onmouseout, onpointerenter, onclick, onload, onchange, onerror) while permitting others such as 'onmouseenter', combined with the failure to escape the attribute key when building the gallery container HTML in foogallery_build_container_attributes_safe(). This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

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

## Which versions are affected by CVE-2026-9134?


## How do I fix CVE-2026-9134?

No fix has been published for CVE-2026-9134 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-9134 being exploited?

There is no known exploitation of CVE-2026-9134 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-9134 and fix it if it is affected.

What it is: CVE-2026-9134 is a medium-severity cross-site scripting vulnerability in fooplugins Photo Gallery by FooGallery : Responsive Image Gallery, Masonry Gallery & Carousel, published on 13 Jun 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-2026-9134 in the wild and no public exploit code.

Affected product: fooplugins Photo Gallery by FooGallery : Responsive Image Gallery, Masonry Gallery & Carousel. 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-2026-9134/ (Markdown: https://insights.sbomify.com/CVE-2026-9134/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-9134
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-9134
- OSV: https://osv.dev/vulnerability/CVE-2026-9134

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-9134/
Summaries are generated and may contain mistakes; the official description above is the record.