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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.002 (8.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 8.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Octobercms October — versions < 3.7.14, >= 4.0.0, < 4.1.10
Weakness classification (CWE)
References
- github.com/octobercms/october/security/advisories/GHSA-j4j5-9x6g-rgxc (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.