# CVE-2025-4855: Support Board <= 3.8.0 - Unauthenticated Authorization Bypass due to Use of Default Secret Key

> Unauthenticated attackers can bypass authorization using hardcoded default secrets to execute arbitrary AJAX actions and modify data in the Support Board plugin.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Jul 2025
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-vv4w-9vmx-jmwp

## What is CVE-2025-4855?

CVE-2025-4855 is a critical vulnerability in Schiocco Support Board, published on 8 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Support Board plugin for WordPress is vulnerable to unauthorized access/modification/deletion of data due to use of hardcoded default secrets in the sb_encryption() function in all versions up to, and including, 3.8.0. This makes it possible for unauthenticated attackers to bypass authorization and execute arbitrary AJAX actions defined in the sb_ajax_execute() function. An attacker can use this vulnerability to exploit CVE-2025-4828 and various other functions unauthenticated.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2025-4855?

It affects 1 product.


Products: Schiocco Support Board.

## How do I fix CVE-2025-4855?

No fix has been published for CVE-2025-4855 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-4855 being exploited?

There is no known exploitation of CVE-2025-4855 in the wild and no public exploit code.

## Other vulnerabilities in Schiocco Support Board

- [CVE-2025-4828](https://insights.sbomify.com/CVE-2025-4828/): Support Board <= 3.8.0 - Unauthenticated Arbitrary File Deletion (critical 9.8)
- [CVE-2026-4815](https://insights.sbomify.com/CVE-2026-4815/): SQL Injection vulnerability in Support Board (high 8.7)
- [CVE-2021-24823](https://insights.sbomify.com/CVE-2021-24823/): Support Board < 3.3.6 - Arbitrary File Deletion via CSRF (high 8.1)
- [CVE-2021-24807](https://insights.sbomify.com/CVE-2021-24807/): Support Board < 3.3.5 - Agent+ Stored Cross-Site Scripting (medium 5.4)
- [CVE-2026-4816](https://insights.sbomify.com/CVE-2026-4816/): Reflected Cross Site Scripting (XSS) vulnerability in Support Board (medium 4.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-4855 and fix it if it is affected.

What it is: CVE-2025-4855 is a critical vulnerability in Schiocco Support Board, published on 8 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-4855 in the wild and no public exploit code.

Affected product: Schiocco Support Board. 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-2025-4855/ (Markdown: https://insights.sbomify.com/CVE-2025-4855/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-4855
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-4855
- OSV: https://osv.dev/vulnerability/CVE-2025-4855

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-4855/
Summaries are generated and may contain mistakes; the official description above is the record.