What is CVE-2026-24907?

CVE-2026-24907 is a medium-severity vulnerability in Octobercms October, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-04-14.

How severe is CVE-2026-24907?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Octobercms October

CVE-2026-24907

October is a Content Management System (CMS) and web platform. Versions prior to 3.7.14 and 4.1.10 contain a stored cross-site scripting (XSS) vulnerability in the Event Log mail preview feature. When viewing logged mail messages, HTML content was rendered in an iframe without proper sandboxing, allowing JavaScript execution in the viewer's browser context. This issue has been fixed in versions 3.7.14 and 4.1.10. If users are unable to update immediately, workarounds include restricting mail template editing permissions to fully trusted administrators only and restricting Event Log viewing permissions to minimize exposure.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (9.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Octobercms October — versions < 3.7.14, >= 4.0.0, < 4.1.10

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-24907?: CVE-2026-24907 is a medium-severity vulnerability in Octobercms October, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-04-14.
How severe is CVE-2026-24907?: Medium severity. CVSS v3 base score is 5.4 out of 10.