# CVE-2020-26574: Cross-site scripting in n/a

> Unauthenticated attackers can inject JavaScript via User-Agent headers, leading to admin session hijacking and root code execution in unsupported Leostream Connection Broker versions.

- **Severity:** Critical 9.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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:** 6 Oct 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-fgqf-9xqq-px3h

## What is CVE-2020-26574?

CVE-2020-26574 is a critical cross-site scripting vulnerability in n/a, published on 6 Oct 2020. 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

Leostream Connection Broker 8.2.x is affected by stored XSS. An unauthenticated attacker can inject arbitrary JavaScript code via the webquery.pl User-Agent HTTP header. It is rendered by the admins the next time they log in. The JavaScript injected can be used to force the admin to upload a malicious Perl script that will be executed as root via libMisc::browser_client. NOTE: This vulnerability only affects products that are no longer supported by the maintainer

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

## Which versions are affected by CVE-2020-26574?

It affects 1 product.


Products: Leostream Connection Broker.

## How do I fix CVE-2020-26574?

No fix has been published for CVE-2020-26574 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-26574 being exploited?

There is no known exploitation of CVE-2020-26574 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2021-41550](https://insights.sbomify.com/CVE-2021-41550/): File upload in n/a (high 7.2)
- [CVE-2021-38157](https://insights.sbomify.com/CVE-2021-38157/): Cross-site scripting in n/a (medium 6.1)
- [CVE-2021-41551](https://insights.sbomify.com/CVE-2021-41551/): Path traversal in n/a (medium 4.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-26574 and fix it if it is affected.

What it is: CVE-2020-26574 is a critical cross-site scripting vulnerability in n/a, published on 6 Oct 2020. 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-2020-26574 in the wild and no public exploit code.

Affected product: n/a. 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-2020-26574/ (Markdown: https://insights.sbomify.com/CVE-2020-26574/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-26574
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-26574
- OSV: https://osv.dev/vulnerability/CVE-2020-26574

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-26574/
Summaries are generated and may contain mistakes; the official description above is the record.