# CVE-2026-14835: SOGO Add Script to Individual Pages Header Footer <= 3.9 - Contributor+ Stored XSS via Post Metabox

> Contributors can inject malicious scripts via post metaboxes, leading to stored XSS that executes in admin and visitor browsers.

- **Severity:** Medium 6.8 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 30 Aug 2026
- **Updated:** 31 Aug 2026
- **Also known as:** GHSA-rmh2-mrxf-cjqv

## What is CVE-2026-14835?

CVE-2026-14835 is a medium-severity cross-site scripting vulnerability in Unknown SOGO Add Script to Individual Pages Header Footer, published on 30 Aug 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

The SOGO Add Script to Individual Pages Header Footer WordPress plugin through 3.9 does not sanitise or escape the custom header/footer script values saved from its post metabox, and does not restrict them to users with the unfiltered_html capability, allowing users with contributor-level access and above to store JavaScript that executes in the browser of any administrator who reviews the post and of any visitor once the post is published.

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

## Which versions are affected by CVE-2026-14835?


## How do I fix CVE-2026-14835?

No fix has been published for CVE-2026-14835 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-14835 being exploited?

There is no known exploitation of CVE-2026-14835 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-14835 and fix it if it is affected.

What it is: CVE-2026-14835 is a medium-severity cross-site scripting vulnerability in Unknown SOGO Add Script to Individual Pages Header Footer, published on 30 Aug 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-14835 in the wild and no public exploit code.

Affected product: Unknown SOGO Add Script to Individual Pages Header Footer. 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-2026-14835/ (Markdown: https://insights.sbomify.com/CVE-2026-14835/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-14835
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-14835
- OSV: https://osv.dev/vulnerability/CVE-2026-14835

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-14835/
Summaries are generated and may contain mistakes; the official description above is the record.