Vulnerability · Published Apr 21, 2026 · Assigned by GitHub_M

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

Low 3.1

In plain English

A low-severity cross-site scripting in october from octobercms. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)3.1Low

Exploit odds (30 days)0.1%top 96.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	october/system	3.7.16	GHSA-jj38-h5w5-mvpf
Packagist	october/system	no fix listed	GHSA-jj38-h5w5-mvpf

Affected products (as reported)

Vendor	Product	Versions
octobercms	october	>= 4.0.0, < 4.1.16< 3.7.16

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N

References

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