What is CVE-2026-27937?

CVE-2026-27937 is a low-severity vulnerability in Octobercms October, classified under Cross-site Scripting. CVSS score: 3.1/10. Published 2026-04-21.

How severe is CVE-2026-27937?

Low severity. CVSS v3 base score is 3.1 out of 10.

XSS in Octobercms October

CVE-2026-27937

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 pro…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (11.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N.

Affected products

Octobercms October — versions >= 4.0.0, < 4.1.16, < 3.7.16

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

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

Frequently asked questions

What is CVE-2026-27937?: CVE-2026-27937 is a low-severity vulnerability in Octobercms October, classified under Cross-site Scripting. CVSS score: 3.1/10. Published 2026-04-21.
How severe is CVE-2026-27937?: Low severity. CVSS v3 base score is 3.1 out of 10.