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.

Attack Vector Network

Attack Complexity High

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
coollabsio coolify unaffected
Version Status Constraints
0 affected ≤ 4.3.17

No data.

No data.

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Project Subscriptions

Vendors Products
Coollabs Subscribe
Coolify Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/coollabsio/coolify cve-icon cve-icon
https://github.com/coollabsio/coolify/blob/v4.3.17/app/Http/Controllers/OauthController.php cve-icon cve-icon
https://github.com/coollabsio/coolify/blob/v4.3.17/routes/web.php cve-icon cve-icon
https://github.com/geo-chen/oss/blob/main/coolify.md cve-icon cve-icon
https://www.vulncheck.com/advisories/coolify-through-4.3.17-oauth-account-takeover-via-unverified-email-matching cve-icon cve-icon
History

Sat, 05 Sep 2026 10:15:00 +0000

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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-05T09:59:07.349Z

Reserved: 2026-09-05T01:59:21.369Z

Link: CVE-2026-86117

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-05T10:16:42.860

Modified: 2026-09-05T10:16:42.860

Link: CVE-2026-86117

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-05T11:30:05Z

Weaknesses