# CVE-2020-36884: BrightSign Digital Signage Diagnostic Web Server 8.2.26 Unauthenticated SSRF

> Unauthenticated attackers can force the BrightSign Digital Signage server to make arbitrary HTTP requests, enabling internal network enumeration and firewall bypass.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Dec 2025
- **Updated:** 11 Dec 2025
- **Also known as:** GHSA-86rv-3v3v-xmw6

## What is CVE-2020-36884?

CVE-2020-36884 is a medium-severity server-side request forgery vulnerability in BrightSign, LLC BrightSign Digital Signage Diagnostic Web Server, published on 10 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

BrightSign Digital Signage Diagnostic Web Server 8.2.26 and less contains an unauthenticated server-side request forgery vulnerability in the 'url' GET parameter of the Download Speed Test service. Attackers can specify external domains to bypass firewalls and perform network enumeration by forcing the application to make arbitrary HTTP requests to internal network hosts.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2020-36884?


## How do I fix CVE-2020-36884?

No fix has been published for CVE-2020-36884 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-36884 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-36884 exists.

Public exploit code:

- BrightSign Digital Signage 8.2.26 - Server-Side Request Forgery (nuclei): http/cves/2020/CVE-2020-36884.yaml

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-36884 and fix it if it is affected.

What it is: CVE-2020-36884 is a medium-severity server-side request forgery vulnerability in BrightSign, LLC BrightSign Digital Signage Diagnostic Web Server, published on 10 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-36884 exists.

Affected product: BrightSign, LLC BrightSign Digital Signage Diagnostic Web Server. 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-2020-36884/ (Markdown: https://insights.sbomify.com/CVE-2020-36884/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-36884
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-36884
- OSV: https://osv.dev/vulnerability/CVE-2020-36884

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-36884/
Summaries are generated and may contain mistakes; the official description above is the record.