# CVE-2026-3995: OPEN-BRAIN <= 0.5.0 - Authenticated (Administrator+) Stored Cross-Site Scripting via 'API Key' Setting

> Administrators can inject arbitrary scripts via the API Key setting, leading to stored XSS execution on the settings page.

- **Severity:** Medium 4.4 (`CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Apr 2026
- **Updated:** 16 Apr 2026
- **Also known as:** GHSA-pq6h-83gw-pj9p

## What is CVE-2026-3995?

CVE-2026-3995 is a medium-severity cross-site scripting vulnerability in faridsaniee OPEN-BRAIN, published on 16 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

The OPEN-BRAIN plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'API Key' settings field in all versions up to, and including, 0.5.0. This is due to insufficient input sanitization and output escaping. The plugin uses sanitize_text_field() which strips HTML tags but does not encode double quotes or other HTML-special characters needed for safe attribute context output. The API key value is saved via update_option() and later output into an HTML input element's value attribute without esc_attr() escaping. This makes it possible for authenticated attackers, with Administrator-level access, to inject arbitrary web scripts via attribute breakout payloads (e.g., double quotes followed by event handlers) that execute whenever a user accesses the plugin settings page.

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

## Which versions are affected by CVE-2026-3995?


## How do I fix CVE-2026-3995?

No fix has been published for CVE-2026-3995 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-3995 being exploited?

There is no known exploitation of CVE-2026-3995 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-3995 and fix it if it is affected.

What it is: CVE-2026-3995 is a medium-severity cross-site scripting vulnerability in faridsaniee OPEN-BRAIN, published on 16 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-3995 in the wild and no public exploit code.

Affected product: faridsaniee OPEN-BRAIN. 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-2026-3995/ (Markdown: https://insights.sbomify.com/CVE-2026-3995/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-3995
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3995
- OSV: https://osv.dev/vulnerability/CVE-2026-3995

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-3995/
Summaries are generated and may contain mistakes; the official description above is the record.