# CVE-2026-6401: Bottom Bar <= 0.1.7 - Cross-Site Request Forgery to Settings Update

> Attackers can trick administrators into updating plugin settings via CSRF due to missing nonce verification in the Bottom Bar WordPress plugin.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 20 May 2026
- **Updated:** 20 May 2026
- **Also known as:** GHSA-3rp8-xffc-p7wp

## What is CVE-2026-6401?

CVE-2026-6401 is a medium-severity vulnerability in svil4ok Bottom Bar, published on 20 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

The Bottom Bar plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to and including 0.1.7. This is due to missing nonce verification on the plugin's settings update forms handled in bottom-bar-admin.php. None of the three settings forms (main settings, sharing services, restore defaults) include a wp_nonce_field(), and the server-side processing code never calls check_admin_referer() or any equivalent nonce validation before processing POST data and calling update_option(). This makes it possible for unauthenticated attackers to trick a logged-in administrator into submitting a crafted request that updates plugin configuration options, such as changing the language, maximum post counts, or enabled sharing services.

Weakness: CWE-352 (Cross-Site Request Forgery)

## Which versions are affected by CVE-2026-6401?


## How do I fix CVE-2026-6401?

No fix has been published for CVE-2026-6401 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-6401 being exploited?

There is no known exploitation of CVE-2026-6401 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-6401 and fix it if it is affected.

What it is: CVE-2026-6401 is a medium-severity vulnerability in svil4ok Bottom Bar, published on 20 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-6401 in the wild and no public exploit code.

Affected product: svil4ok Bottom Bar. 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-2026-6401/ (Markdown: https://insights.sbomify.com/CVE-2026-6401/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-6401
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-6401
- OSV: https://osv.dev/vulnerability/CVE-2026-6401

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-6401/
Summaries are generated and may contain mistakes; the official description above is the record.