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CVE-2025-34157

Coollabs Coolify cross-site scripting (XSS)

9.0 CRITICALEPSS 0.46%
  1. Published27 Aug 2025

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Affected products

Coollabs Coolify< 4.0.0 · 4.0.0

Remediation

Fixed in
Coollabs Coolify≥ 4.0.0

References

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Frequently asked

Is CVE-2025-34157 being actively exploited?

CVE-2025-34157 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.46%.

How severe is CVE-2025-34157?

CVE-2025-34157 has a CVSS 3.1 base score of 9.0, rated critical. EPSS estimates a 0.46% probability of exploitation.

Which products are affected by CVE-2025-34157?

Affected products include Coollabs Coolify.

How do I fix CVE-2025-34157?

Upgrade affected software to a fixed version, for example Coollabs Coolify 4.0.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-34157 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.