# CVE-2025-26621: PYSEC-2025-180 - OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables…

Source: https://junglewise.ai/threats/cve-2025-26621-pysec-2025-180-opencti-is-an-open-source-platform-for-managing  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-05-19  
License: CC BY 4.0 with a link back

CVE-2025-26621 · Severity: low · CVSS 3.1 · Published 2025-05-19

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.

Technologies: [pycti (PyPI)](https://junglewise.ai/threats/technologies/pycti). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2025-26621 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-26621 being exploited in the wild.

**How severe is CVE-2025-26621?** Low severity, with a CVSS score of 3.1, published 19 May 2025.

**Which products and versions are affected?** pycti (PyPI) ECOSYSTEM:introduced=0,fixed=6.5.2.

**Is there a fix for CVE-2025-26621?** Yes. pycti (PyPI): upgrade to 6.5.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2025-26621?** Check whether you run pycti (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- pycti (PyPI): upgrade to 6.5.2 or later

  ```sh
  pip install "pycti>=6.5.2"
  ```


## Affected products

- pycti (PyPI) ECOSYSTEM:introduced=0,fixed=6.5.2

## Identifiers

- CVE-2025-26621
- PYSEC-2025-180

## Related threats

- [Filigran OpenCTI Code Injection in GraphQL API](https://junglewise.ai/threats/cve-2026-35211-filigran-opencti-code-injection-in-graphql-api)
- [Filigran OpenCTI authorization bypass via synchronized-upsert header](https://junglewise.ai/threats/cve-2026-35210-filigran-opencti-authorization-bypass-via-synchronized-upsert)
- [OpenCTI SSRF in Data Ingestion Feature](https://junglewise.ai/threats/cve-2026-21887-opencti-ssrf-in-data-ingestion-feature)
- [OpenCTI GraphQL introspection restriction bypass](https://junglewise.ai/threats/cve-2024-37155-opencti-graphql-introspection-restriction-bypass)
- [OpenCTI XSS in email-message observable body rendering](https://junglewise.ai/threats/cve-2026-35212-opencti-xss-in-email-message-observable-body-rendering)