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.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
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
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.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-73090 being exploited?
There is no known exploitation of CVE-2026-73090 in the wild and no public exploit code.
Sources
Also known as GHSA-g9p4-f7h8-hc86.