XSS in Octobercms October
CVE-2026-24906
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 Backend Editor Settings. The Markup Classes fields (used for paragraph styles, inline styles, table styles, etc.) did not sanitize input to valid CSS class name characters. Malicious values were rendered unsanitized in Froala editor dropdown menus, allowing JavaScript execution when any user opened a RichEditor. Exploitation could lead to privilege escalation if a superuser opens any RichEditor during routine content editing (e.g., editing a blog post), and requires authenticated backend access with editor settings permissions. This issue has been fixed in versions 3.7.14 and 4.1.10. To workaround this issue, restrict editor settings permissions to fully trusted administrators only
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: 0.003 (15.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 15.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · 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-6qmh-j78v-ffp7 (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-24906?
- CVE-2026-24906 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-2026-24906?
- Medium severity. CVSS v3 base score is 5.4 out of 10.