XSS in Coollabs Coolify
CVE-2025-34157
Coolify versions prior to v4.0.0-beta.420.6 are vulnerable to a stored cross-site scripting (XSS) attack in the project creation workflow. An authenticated user with low privileges can create a project with a maliciously crafted name containing embedded JavaScript. When an administrator attempts to delete the project or its associated resource, the payload executes in the admin’s browser context. This results in full compromise of the Coolify instance, including theft of API tokens, session cookies, and access to WebSocket-based terminal sessions on managed servers.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (38.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 38.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Coollabs Coolify — versions 4.0.0
- Coollabs Technologies Coolify — versions 0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/coollabsio/coolify/releases/tag/v4.0.0-beta.420.7 (vendor-advisory, Release Notes, patch)
- coolify.io/ (Product, product)
- github.com/Eyodav/CVE-2025-34157 (technical-description, Third Party Advisory, exploit)
Frequently asked questions
- What is CVE-2025-34157?
- CVE-2025-34157 is a critical-severity vulnerability in Coollabs Coolify, classified under Improper Input Validation. CVSS score: 9.0/10. Published 2025-08-27.
- How severe is CVE-2025-34157?
- Critical severity. CVSS v3 base score is 9.0 out of 10.
- Is CVE-2025-34157 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.