CVE-2026-56249: Capgo - Unauthorized Channel Overwrite and Ownership Takeover via POST /channel Name Collision
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.createchannel permission can exploit a logic mismatch between existence validation and upsert operations to reassign channel ownership and modify critical production channel configurations.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Capgoto a version that resolves this vulnerability.Fixed in 12.128.2 - Compensating control
Block or restrict access to the POST /channel endpoint (channel creation/upsert) so only authorized users can create or modify channels, preventing name-collision overwrites and channel ownership reassignment.
Event History
Frequently Asked Questions
What is the severity of CVE-2026-56249?
CVE-2026-56249 has a high severity rating of 7.2.
How do I fix CVE-2026-56249?
To mitigate CVE-2026-56249, update Capgo to version 12.128.2 or later.
What type of vulnerability is CVE-2026-56249?
CVE-2026-56249 is an authorization bypass vulnerability affecting the channel creation feature.
Who is affected by CVE-2026-56249?
Authenticated users with app.create_channel permission are affected by CVE-2026-56249.
What could happen if CVE-2026-56249 is exploited?
Exploitation of CVE-2026-56249 could allow attackers to overwrite existing channels and take ownership.