PT-2025-22013 · Opencti+1 · Opencti+1

Itlabbet · CVE-2025-26621 · Published 2025-05-19 · Updated 2025-08-06

Positive Technologies (AI Summary)

CVSS v3.1

7.6

High

Base vector

AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:H

Name of the Vulnerable Software and Affected Versions: OpenCTI versions prior to 6.5.2

Description: The issue affects an open source platform for managing cyber threat intelligence knowledge and observables. Prior to version 6.5.2, any user with the capability to manage customizations can edit a 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.

Recommendations: For versions prior to 6.5.2, update to version 6.5.2 to resolve the issue. As a temporary workaround, consider restricting the capability to manage customizations to prevent unauthorized users from editing webhooks.

Exploit

Fix

DoS

Prototype Pollution

Code Injection

Weakness Enumeration

CWE-1321

CWE-94

Related Identifiers

CVE-2025-26621

GHSA-GQ63-JM3H-374P

GHSA-MF88-G2WQ-P7QM

PYSEC-2025-180

Affected Products

Node.Js

Opencti

References · 9

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/26xxx/CVE-2025-26621.json · Exploit
• https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-gq63-jm3h-374p · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-26621 · Security Note
• https://osv.dev/vulnerability/CVE-2025-26621 · Vendor Advisory
• https://osv.dev/vulnerability/PYSEC-2025-180 · Vendor Advisory
• https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-mf88-g2wq-p7qm · Note
• https://t.me/cvetracker/24247 · Telegram Post
• https://twitter.com/CVEnew/status/1924523090354307473 · Twitter Post
• https://t.me/cveNotify/131119 · Telegram Post