CVE-2025-26621

OpenCTI vulnerable to Denial of Service through web hook

Published May 19, 2025 CVSS 3.1 · 7.6 High EPSS < 1% KEV · Not listed
Description
OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables. Prior to version 6.5.2, any user with the capability manage customizations can edit webhook that will execute javascript code. This can be abused to cause a denial of service attack by prototype pollution, making the node js server running the OpenCTI frontend become unavailable. Version 6.5.2 fixes the issue.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2025-15725 OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables. Prior to version 6.5.2, any user with the capability manage customizations can edit webhook that will execute javascript code. This can be abused to cause a denial of service attack by prototype pollution, making the node js server running the OpenCTI frontend become unavailable. Version 6.5.2 fixes the issue.
History
Type Values Removed Values Added
First Time appeared Citeum
Citeum opencti
Weaknesses CWE-1321
CPEs cpe:2.3:a:citeum:opencti:*:*:*:*:*:*:*:*
Vendors & Products Citeum
Citeum opencti
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables. Prior to version 6.5.2, any user with the capability manage customizations can edit webhook that will execute javascript code. This can be abused to cause a denial of service attack by prototype pollution, making the node js server running the OpenCTI frontend become unavailable. Version 6.5.2 fixes the issue.
Title OpenCTI vulnerable to Denial of Service through web hook
Weaknesses CWE-94
References
Metrics cvssV3_1

{'score': 7.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
May 19, 2025, 6:01 PM
Reserved
Feb 12, 2025, 2:51 PM
Status
Analyzed
Published
May 19, 2025, 4:15 PM
Modified
Jun 17, 2026, 9:02 AM