CVE-2025-34157Public exploitNetwork attack vector

Administrator session takeover via stored project name

Published Aug 27, 2025 · Updated Jul 14, 2026

Stored XSS in Coolify before 4.0.0-beta.420.7 allows remote authenticated users to execute JavaScript in an administrator's browser. The project workflow stores an HTML event handler in a project name, and the deletion view renders that name as executable markup. A low-privilege member must create the project and an administrator must delete it; execution exposes session cookies, API tokens, and terminal WebSocket actions.

CVSS severity9.4
Critical
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Coolify before 4.0.0-beta.420.7 allows remote authenticated users to execute JavaScript in an administrator's browser. The project workflow stores an HTML event handler in a project name, and the deletion view renders that name as executable markup. A low-privilege member must create the project and an administrator must delete it; execution exposes session cookies, API tokens, and terminal WebSocket actions.

The record

CVE
CVE-2025-34157
Published
Aug 27, 2025
Updated
Jul 14, 2026
Vendor
coolLabs
Product
Coolify
Classifications
CWE-79, CWE-20, T1528, T1539
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 27, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <4.0.0.-beta.420.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

coolLabs · Coolifyversion=0 <4.0.0.-beta.420.7

Published CVSS scores

9.4VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-20Improper Input Validation
T1528Steal Application Access Token
T1539Steal Web Session Cookie

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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