CVE-2026-86117: Improper Authentication in coollabsio coolify
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.
CVSS v4.0
Score 9.2critical
Affected software
coollabsio
coolify
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-86117 describes an authentication bypass vulnerability in Coolify through version 4.3.17. The OAuth callback handler improperly authenticates users based solely on their email address without verifying the OAuth provider's assertions or binding OAuth identities. An attacker can exploit this by registering a victim's email address on any enabled OAuth provider, thereby gaining authenticated sessions as that user without needing passwords or two-factor authentication.
Potential Impact
Successful exploitation allows attackers to bypass password and two-factor authentication protections, gaining unauthorized access to victim accounts. This can lead to account takeover and potential unauthorized actions within the affected Coolify environment.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-05T01:59:21.369Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a9bed73acd9273b49b1c66e
Added to database: 09/05/2026, 10:22:43 UTC
Last enriched: 09/25/2026, 02:47:18 UTC
Last updated: 10/20/2026, 18:48:24 UTC
Views: 121
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