# CVE-2026-27937: October CMS: Reflected XSS via DataTable Form Widget

Source: https://junglewise.ai/threats/cve-2026-27937-october-cms-reflected-xss-via-datatable-form-widget  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-21. Updated: 2026-05-11  
License: CC BY 4.0 with a link back

CVE-2026-27937 · Severity: low · CVSS 3.1 · Published 2026-04-21

October is a Content Management System (CMS) and web platform. Prior to 3.7.16 and 4.1.16, a reflected Cross-Site Scripting (XSS) vulnerability was identified in the backend DataTable widget where a query parameter was rendered without proper output escaping. This vulnerability is fixed in 3.7.16 and 4.1.16.

Technologies: [october/system (Packagist)](https://junglewise.ai/threats/technologies/october-system). Vendors: [Packagist](https://junglewise.ai/threats/vendors/packagist).

## Quick answers

**Is CVE-2026-27937 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-27937 being exploited in the wild.

**How severe is CVE-2026-27937?** Low severity, with a CVSS score of 3.1, published 21 April 2026.

**Which products and versions are affected?** october/system (Packagist) ECOSYSTEM:introduced=0,fixed=3.7.16.

**Is there a fix for CVE-2026-27937?** Yes. october/system (Packagist): upgrade to 3.7.16 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2026-27937?** Check whether you run october/system (Packagist) 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

- october/system (Packagist): upgrade to 3.7.16 or later

  ```sh
  composer require october/system:^3.7.16
  ```


## Affected products

- october/system (Packagist) ECOSYSTEM:introduced=0,fixed=3.7.16

## Identifiers

- CVE-2026-27937
- GHSA-jj38-h5w5-mvpf

## References

- [https://api.github.com/users/daftspunk](https://api.github.com/users/daftspunk)
- [https://github.com/daftspunk](https://github.com/daftspunk)
- [https://api.github.com/users/daftspunk/gists%7B/gist_id%7D](https://api.github.com/users/daftspunk/gists%7B/gist_id%7D)
- [https://api.github.com/users/daftspunk/repos](https://api.github.com/users/daftspunk/repos)
- [https://avatars.githubusercontent.com/u/1392869?v=4](https://avatars.githubusercontent.com/u/1392869?v=4)
- [https://api.github.com/users/daftspunk/events%7B/privacy%7D](https://api.github.com/users/daftspunk/events%7B/privacy%7D)

## Related threats

- [October CMS PHP object injection in widget session storage](https://junglewise.ai/threats/cve-2026-49400-october-cms-php-object-injection-in-widget-session-storage)
- [October CMS Twig sandbox bypass in Safe Mode](https://junglewise.ai/threats/cve-2026-46696-october-cms-twig-sandbox-bypass-in-safe-mode)
- [October CMS: Editor Sub-Permission Bypass for Asset and Blueprint File Operations](https://junglewise.ai/threats/cve-2026-29179-october-cms-editor-sub-permission-bypass-for-asset-and-blueprint)
- [October CMS has Safe Mode Bypass via CSS Preprocessor Compilers](https://junglewise.ai/threats/cve-2026-26067-october-cms-has-safe-mode-bypass-via-css-preprocessor-compilers)
- [October CMS has Stored XSS in Event Log Mail Preview](https://junglewise.ai/threats/cve-2026-24907-october-cms-has-stored-xss-in-event-log-mail-preview)