# CVE-2021-37211: Larvata Digital Technology Co. Ltd. FLYGO - Stored XSS

> Remote attackers can inject JavaScript into the Flygo bulletin function, enabling stored XSS attacks against other users.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A: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:** 9 Aug 2021
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-wgqq-h84j-p8mg

## What is CVE-2021-37211?

CVE-2021-37211 is a medium-severity cross-site scripting vulnerability in Larvata Digital Technology Co. Ltd. FLYGO, published on 9 Aug 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

The bulletin function of Flygo does not filter special characters while a new announcement is added. Remoter attackers can use the vulnerability with general user’s credential to inject JavaScript and execute stored XSS attacks.

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

## Which versions are affected by CVE-2021-37211?

It affects 1 product.


Products: Larvata Flygo.

## How do I fix CVE-2021-37211?

No fix has been published for CVE-2021-37211 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-37211 being exploited?

There is no known exploitation of CVE-2021-37211 in the wild and no public exploit code.

## Other vulnerabilities in Larvata Digital Technology Co. Ltd. FLYGO

- [CVE-2021-37214](https://insights.sbomify.com/CVE-2021-37214/): Larvata Digital Technology Co. Ltd. FLYGO - Use of Incorrectly-Resolved Name or Reference-3 (high 8.8)
- [CVE-2021-37212](https://insights.sbomify.com/CVE-2021-37212/): Larvata Digital Technology Co. Ltd. FLYGO - Use of Incorrectly-Resolved Name or Reference-1 (medium 5.4)
- [CVE-2021-37213](https://insights.sbomify.com/CVE-2021-37213/): Larvata Digital Technology Co. Ltd. FLYGO - Use of Incorrectly-Resolved Name or Reference-2 (medium 4.3)
- [CVE-2021-37215](https://insights.sbomify.com/CVE-2021-37215/): Larvata Digital Technology Co. Ltd. FLYGO - Use of Incorrectly-Resolved Name or Reference-4 (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-37211 and fix it if it is affected.

What it is: CVE-2021-37211 is a medium-severity cross-site scripting vulnerability in Larvata Digital Technology Co. Ltd. FLYGO, published on 9 Aug 2021. 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-2021-37211 in the wild and no public exploit code.

Affected product: Larvata Digital Technology Co. Ltd. FLYGO. 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-2021-37211/ (Markdown: https://insights.sbomify.com/CVE-2021-37211/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-37211
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-37211
- OSV: https://osv.dev/vulnerability/CVE-2021-37211

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-37211/
Summaries are generated and may contain mistakes; the official description above is the record.