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.

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

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). 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
```
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

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