CVE-2026-24907

October CMS has Stored XSS via Event Log Mail Preview

State: Published
Severity: 5.1 Medium
Published: Apr 14, 2026
Updated: Apr 14, 2026
Reserved: Jan 27, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	5.1 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected Products

Product	Versions
octoberoctobercms	< 3.7.14Affected >= 4.0.0, < 4.1.10Affected

References

https://github.com/octobercms/october/security/advisories/GHSA-j4j5-9x6g-rgxc

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