# CVE-2026-4816: Reflected Cross Site Scripting (XSS) vulnerability in Support Board

> Attackers can execute JavaScript in victims' browsers via a malicious URL, potentially stealing session cookies or performing actions on behalf of the user.

- **Severity:** Medium 4.8 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 25 Mar 2026
- **Updated:** 25 Mar 2026
- **Also known as:** GHSA-r9fv-65q7-7m5c

## What is CVE-2026-4816?

CVE-2026-4816 is a medium-severity cross-site scripting vulnerability in Schiocco Support Board, published on 25 Mar 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

A Reflected Cross Site Scripting (XSS) vulnerability has been found in Support Board v3.7.7. This vulnerability allows an attacker to execute JavaScript code in the victim's browser by sending the victim a malicious URL using the 'search' parameter in '/supportboard/include/articles.php'. This vulnerability can be exploited to steal sensitive user data, such as session cookies, or to perform actions on behalf of the user.

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

## Which versions are affected by CVE-2026-4816?

It affects 1 product.


Products: Schiocco Support Board.

## How do I fix CVE-2026-4816?

No fix has been published for CVE-2026-4816 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-4816 being exploited?

There is no known exploitation of CVE-2026-4816 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-2025-4855](https://insights.sbomify.com/CVE-2025-4855/): Support Board <= 3.8.0 - Unauthenticated Authorization Bypass due to Use of Default Secret Key (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)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4816 and fix it if it is affected.

What it is: CVE-2026-4816 is a medium-severity cross-site scripting vulnerability in Schiocco Support Board, published on 25 Mar 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-4816 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-2026-4816/ (Markdown: https://insights.sbomify.com/CVE-2026-4816/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4816
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4816
- OSV: https://osv.dev/vulnerability/CVE-2026-4816

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-4816/
Summaries are generated and may contain mistakes; the official description above is the record.