# CVE-2021-26636: Maxboard Remote Code Execution

> Attackers can exploit SQL injection and XSS in MaxBoard to achieve remote code execution, leading to privilege escalation and data exposure.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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:** A user has to click or open something
- **Fix available:** No
- **Published:** 22 Jun 2022
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-c5f6-5rv4-j98x

## What is CVE-2021-26636?

CVE-2021-26636 is a high-severity SQL injection vulnerability in MaxBoard, published on 22 Jun 2022. 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

Stored XSS and SQL injection vulnerability in MaxBoard could lead to occur Remote Code Execution, which could lead to information exposure and privilege escalation.

Weakness: CWE-89 (Improper Neutralization of Special Elements used in an SQL Command), CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2021-26636?

It affects 1 product.


Products: Maxb Maxboard.

## How do I fix CVE-2021-26636?

No fix has been published for CVE-2021-26636 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-26636 being exploited?

There is no known exploitation of CVE-2021-26636 in the wild and no public exploit code.

## Other vulnerabilities in MaxBoard

- [CVE-2021-26634](https://insights.sbomify.com/CVE-2021-26634/): Maxboard multiple vulnerabilities (critical 9.8)
- [CVE-2021-26628](https://insights.sbomify.com/CVE-2021-26628/): MaxBoard XSS and File Upload Vulnerability (high 8.1)
- [CVE-2021-26633](https://insights.sbomify.com/CVE-2021-26633/): Maxboard SQL injection and LFI vulnerability (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-26636 and fix it if it is affected.

What it is: CVE-2021-26636 is a high-severity SQL injection vulnerability in MaxBoard, published on 22 Jun 2022. 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-2021-26636 in the wild and no public exploit code.

Affected product: MaxBoard. 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-2021-26636/ (Markdown: https://insights.sbomify.com/CVE-2021-26636/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-26636
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-26636
- OSV: https://osv.dev/vulnerability/CVE-2021-26636

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-26636/
Summaries are generated and may contain mistakes; the official description above is the record.