CVE-2026-86117

Coolify through 4.3.17 OAuth Account Takeover via Unverified Email Matching

Published Sep 5, 2026 CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Coolify through 4.3.17 OAuth Account Takeover via Unverified Email Matching
First Time appeared Coollabs
Coollabs coolify
Weaknesses CWE-287
CPEs cpe:2.3:a:coollabs:coolify:*:*:*:*:*:*:*:*
Vendors & Products Coollabs
Coollabs coolify
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.2, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Sep 24, 2026, 2:21 PM
Reserved
Sep 5, 2026, 1:59 AM
Status
Deferred
Published
Sep 5, 2026, 10:16 AM
Modified
Sep 10, 2026, 4:18 PM