# CVE-2026-57167: PeerTube: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

> Attackers can inject arbitrary JavaScript into video watch pages via unescaped JSON-LD metadata, executing code in the victim's browser context.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/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:** 10 Jul 2026
- **Updated:** 10 Jul 2026
- **Also known as:** GHSA-jxwq-h9xv-hr28

## What is CVE-2026-57167?

CVE-2026-57167 is a medium-severity cross-site scripting vulnerability in Chocobozzz PeerTube, published on 10 Jul 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

PeerTube is an ActivityPub-federated video streaming platform. Prior to 8.2.2, server-side-rendered video watch pages embed a schema.org JSON-LD block by JSON.stringify-ing video metadata without escaping less-than, greater-than, or slash characters, allowing a value containing the byte sequence that closes a script element to inject arbitrary HTML or JavaScript that executes in the instance origin for visitors to the attacker's videos. This issue is fixed in version 8.2.2.

Weakness: CWE-80 (Improper Neutralization of Script-Related HTML Tags in a Web Page)

## Which versions are affected by CVE-2026-57167?


## How do I fix CVE-2026-57167?

No fix has been published for CVE-2026-57167 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-57167 being exploited?

There is no known exploitation of CVE-2026-57167 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-57167 and fix it if it is affected.

What it is: CVE-2026-57167 is a medium-severity cross-site scripting vulnerability in Chocobozzz PeerTube, published on 10 Jul 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-2026-57167 in the wild and no public exploit code.

Affected product: Chocobozzz PeerTube. 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-2026-57167/ (Markdown: https://insights.sbomify.com/CVE-2026-57167/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-57167
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-57167
- OSV: https://osv.dev/vulnerability/CVE-2026-57167

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-57167/
Summaries are generated and may contain mistakes; the official description above is the record.