CVE-2026-24906 — Cross-site Scripting in October

CWE-79 — Cross-site Scripting3 documents3 sources
Severity
5.1MEDIUMNVD
EPSS
0.0%
top 98.66%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Octobercms OctoberOctober System
Timeline
PublishedApr 14

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 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 lea…

CVSS vector

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

Affected Packages2 packages

▶Packagistoctober/system4.0.0 — 4.1.10+1
▶CVEListV5octobercms/october< 3.7.14+1

🔴Vulnerability Details

2
GHSA
October CMS has Stored XSS in Backend Editor Markup Classes↗2026-04-14
▶
VulDB
October CMS up to 3.7.13/4.1.9 Setting cross site scripting (GHSA-6qmh-j78v-ffp7)↗2026-04-14
▶