# CVE-2026-73090: PeerTube: Cross-origin remote video takeover via Update activity

> A malicious federated server can rewrite video metadata and media files on another PeerTube instance due to missing authorization checks in Update activities.

- **Severity:** Critical 9.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Aug 2026
- **Updated:** 13 Aug 2026
- **Also known as:** GHSA-g9p4-f7h8-hc86

## What is CVE-2026-73090?

CVE-2026-73090 is a critical missing authorization vulnerability in Chocobozzz PeerTube, published on 11 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

PeerTube is an ActivityPub-federated video streaming platform. Prior to 8.2.2, processUpdateActivity and processUpdateVideo accept an ActivityPub Update containing a Video object without verifying that byActor.url is authorized for the host in videoObject.id, allowing a malicious federated server to rewrite another server's video metadata, visibility, media file, and HLS URLs. This issue is fixed in version 8.2.2.

Weakness: CWE-863 (Incorrect Authorization)

## Which versions are affected by CVE-2026-73090?


## How do I fix CVE-2026-73090?

No fix has been published for CVE-2026-73090 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-73090 being exploited?

There is no known exploitation of CVE-2026-73090 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-73090 and fix it if it is affected.

What it is: CVE-2026-73090 is a critical missing authorization vulnerability in Chocobozzz PeerTube, published on 11 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-73090 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-2026-73090/ (Markdown: https://insights.sbomify.com/CVE-2026-73090/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-73090
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-73090
- OSV: https://osv.dev/vulnerability/CVE-2026-73090

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-73090/
Summaries are generated and may contain mistakes; the official description above is the record.