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CVE-2026-27882— Coolify: Timing Attack in GitLab Webhook Token Validation

Quick assessment

Affected
coollabsio coolify
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

coolLabs Coolify是coolLabs团队开源的一个开源和自托管的 Heroku/Netlify/Vercel 替代品。 CoolLabs Coolify 4.0.0-beta.461之前版本存在侧信道信息泄露漏洞，该漏洞源于使用非常量时间字符串比较运算符(!==)验证webhook秘密令牌，容易受到计时攻击，可能导致攻击者通过测量响应时间差异逐步发现秘密令牌。

CVSS 4.8 · Medium EPSS 0.23% · P12

Possible ATT&CK Techniques 1 AI

T1595 · Active Scanning

Affected Version Matrix 1

VendorProduct Version RangeStatus
coollabsio coolify < 4.0.0-beta.461 affected
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I. Basic Information for CVE-2026-27882

Vulnerability Information
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Vulnerability Title
Coolify: Timing Attack in GitLab Webhook Token Validation
Source: CVE Program / CVE List V5
Vulnerability Description
Coolify is an open-source and self-hostable tool for managing servers, applications, and databases. Prior to 4.0.0-beta.461, the GitLab webhook endpoint uses a non-constant-time string comparison operator (!==) to validate the webhook secret token. This implementation is vulnerable to timing attacks, which could allow an attacker to gradually discover the secret token by measuring response time differences. This vulnerability is fixed in 4.0.0-beta.461.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
CoolLabs Coolify 侧信道信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
coolLabs Coolify是coolLabs团队开源的一个开源和自托管的 Heroku/Netlify/Vercel 替代品。 CoolLabs Coolify 4.0.0-beta.461之前版本存在侧信道信息泄露漏洞，该漏洞源于使用非常量时间字符串比较运算符(!==)验证webhook秘密令牌，容易受到计时攻击，可能导致攻击者通过测量响应时间差异逐步发现秘密令牌。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
coollabsio coolify < 4.0.0-beta.461 -

II. Public POCs for CVE-2026-27882

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III. Intelligence Information for CVE-2026-27882

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Vendor Advisories for CVE-2026-27882 (1)

Same Patch Batch · coollabsio · 2026-06-30 · 6 CVEs total

CVE-2026-27957 8.8 HIGH Coolify: Authenticated RCE via command injection in CA certificate management feature
CVE-2026-27955 6.6 MEDIUM Coolify: Command Injection via Single-Quote Breakout in `executeInDocker()`
CVE-2026-27883 5.0 MEDIUM Coolify: IDOR in Deployment API - Cross-Team Deployment Information Disclosure
CVE-2026-27881 5.0 MEDIUM Coolify: Cross-team deployment information disclosure via GET /api/v1/deployments/{uuid} (
CVE-2026-27956 4.3 MEDIUM Coolify: Cross-team application domain enumeration via domains_by_server endpoint

IV. Related Vulnerabilities

Same product: coolify
Same vendor: coollabsio
Same weakness: CWE-208

V. Comments for CVE-2026-27882

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