October: Reflected XSS via DataTable Form Widget

published 2026-04-21 6 mo ago modified 2026-10-26 13 d ago also EUVD-2026-24157 , GHSA-jj38-h5w5-mvpf

cvss: 3.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.1%; EPSS 0.1% chance of exploitation in 30 days, percentile 3%
public exploits: 0; none known

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.

Patch / fix

fixed in 2

packagist october/system 3.7.16
octobercms october 3.7.16, 4.1.16

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 6 mo ago (2026-04-21)

Exploit prediction

0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	3.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
GitHub	3.1	3.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
packagist	october/system	<3.7.16 >=4.0.0	3.7.16

Affected products

octobercms october

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

github.com /octobercms/october/security/advisories/GHSA-jj38-h5w5-mvpf
web
nvd.nist.gov /vuln/detail/CVE-2026-27937
advisory
github.com /octobercms/october
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary