CVE-2026-27882CWE-208

Coolify: Timing Attack in GitLab Webhook Token Validation

Medium · published June 30, 2026

CVSS v3.1
4.8
EPSS
0%
Percentile
13.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.8 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00229 · 13.0th percentile
Weakness
CWE-208 · Observable Timing Discrepancy
Published
2026-06-30T14:26Z
EPSS history
Timeline
  • 30 JUN 14:26Z
    Coolify: Timing Attack in GitLab Webhook Token Validation
    cvelistv5