CVE-2026-86117 Coolify through 4.3.17 OAuth Account Takeover via Unverified Email Matching
Attackers can hijack user accounts by registering their email on an OAuth provider, bypassing authentication and 2FA in Coolify.
- 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-2026-86117?
CVE-2026-86117 is a critical authentication bypass vulnerability in coollabsio coolify, published on 5 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Coolify through 4.3.17 contains an authentication bypass vulnerability in the OAuth callback handler that signs users into existing accounts based solely on email address without verifying provider assertions or binding OAuth identities. Attackers can register a victim's email address on any enabled OAuth provider to obtain authenticated sessions as that user, bypassing password requirements and two-factor authentication.
Weakness: CWE-287
Which versions are affected by CVE-2026-86117?
How do I fix CVE-2026-86117?
No fix has been published for CVE-2026-86117 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-86117 being exploited?
There is no known exploitation of CVE-2026-86117 in the wild and no public exploit code.
Sources
Also known as GHSA-rchm-727g-v36m.