CVE-2025-26621
OpenCTI Prototype Pollution Denial of Service
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.
INFO
Published Date :
May 19, 2025, 4:15 p.m.
Last Modified :
Aug. 6, 2025, 5:54 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-26621.
| URL | Resource |
|---|---|
| https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-gq63-jm3h-374p | Vendor Advisory |
| https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-mf88-g2wq-p7qm | Not Applicable |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-26621 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-26621
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-26621 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-26621 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Aug. 06, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H Added CWE CWE-1321 Added CPE Configuration OR *cpe:2.3:a:citeum:opencti:*:*:*:*:*:*:*:* versions up to (excluding) 6.5.2 Added Reference Type GitHub, Inc.: https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-gq63-jm3h-374p Types: Vendor Advisory Added Reference Type GitHub, Inc.: https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-mf88-g2wq-p7qm Types: Not Applicable -
New CVE Received by [email protected]
May. 19, 2025
Action Type Old Value New Value 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. Added CVSS V3.1 AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:H Added CWE CWE-94 Added Reference https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-gq63-jm3h-374p Added Reference https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-mf88-g2wq-p7qm