CVE-2026-56249 Capgo - Unauthorized Channel Overwrite and Ownership Takeover via POST /channel Name Collision
Authenticated users can overwrite existing channels and steal ownership due to flawed validation logic in the channel creation endpoint.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-56249?
CVE-2026-56249 is a high-severity missing authorization vulnerability in Capgo, published on 30 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Capgo before 12.128.2 contains an authorization bypass vulnerability in the channel creation endpoint that allows authenticated users to overwrite existing channels by reusing their names. Attackers with app.create_channel permission can exploit a logic mismatch between existence validation and upsert operations to reassign channel ownership and modify critical production channel configurations.
Weakness: CWE-285
Which versions are affected by CVE-2026-56249?
How do I fix CVE-2026-56249?
No fix has been published for CVE-2026-56249 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-2026-56249 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-56249 exists.
Sources
Also known as GHSA-644f-gvrf-jgw7, GHSA-vj24-j594-3wv3.