CVE-2025-59158
Published: 05 January 2026
Summary
CVE-2025-59158 is a critical-severity Improper Encoding or Escaping of Output (CWE-116) vulnerability in Coollabs Coolify. Its CVSS base score is 9.4 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique JavaScript (T1059.007); ranked at the 37.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-15 (Information Output Filtering).
Deeper analysis
Coolify, an open-source and self-hostable tool for managing servers, applications, and databases, is affected by CVE-2025-59158, a stored cross-site scripting (XSS) vulnerability in its project creation workflow. Versions prior to and including v4.0.0-beta.420.6 are vulnerable. The flaw, associated with CWE-116 (Improper Encoding or Escaping of Output) and CWE-79 (Improper Neutralization of Input During Web Page Generation), carries a CVSS v3.1 base score of 8.0 (AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H).
An authenticated user with low privileges, such as a member role, can exploit the vulnerability by creating a project with a maliciously crafted name containing embedded JavaScript. When an administrator later attempts to delete the project or its associated resource, the payload executes automatically in the admin’s browser context.
The official GitHub security advisory (GHSA-h52r-jxv9-9vhf) documents the issue and confirms that Coolify version 4.0.0-beta.420.7 contains a patch. Security practitioners should urge administrators to update to this version or later to mitigate the risk.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-206246
Vulnerability details
Coolify is an open-source and self-hostable tool for managing servers, applications, and databases. Coolify versions prior to and including 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…
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(e.g., member role) can create a project with a maliciously crafted name containing embedded JavaScript. When an administrator later attempts to delete the project or its associated resource, the payload automatically executes in the admin’s browser context. Version 4.0.0-beta.420.7 contains a patch for the issue.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Stored XSS enables arbitrary JavaScript execution in admin browser context when project deletion triggers payload.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Filters project names during output to the admin's browser, preventing execution of embedded JavaScript from stored XSS payloads.
Validates project name inputs during creation to reject malicious JavaScript, stopping storage of exploitable payloads.
Remediates the specific stored XSS flaw by applying the patch in Coolify version 4.0.0-beta.420.7 or later.