Is CVE-2026-24906 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-24906 being exploited in the wild.

How severe is CVE-2026-24906?

Medium severity, with a CVSS score of 5.4, published 14 April 2026.

Which products and versions are affected?

october/system (Packagist) ECOSYSTEM:introduced=4.0.0,fixed=4.1.10.

Is there a fix for CVE-2026-24906?

Yes. october/system (Packagist): upgrade to 4.1.10 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Am I affected by CVE-2026-24906?

Check whether you run Octobercms October or october/system (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-24906: October CMS has Stored XSS in Backend Editor Markup Classes

CVE-2026-24906 · Severity: medium · CVSS 5.4 · Published 2026-04-14

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

Technologies: Octobercms October, october/system (Packagist). Vendors: Octobercms, Packagist.

Quick answers

Is CVE-2026-24906 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-24906 being exploited in the wild.
How severe is CVE-2026-24906?: Medium severity, with a CVSS score of 5.4, published 14 April 2026.
Which products and versions are affected?: october/system (Packagist) ECOSYSTEM:introduced=4.0.0,fixed=4.1.10.
Is there a fix for CVE-2026-24906?: Yes. october/system (Packagist): upgrade to 4.1.10 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-24906?: Check whether you run Octobercms October or october/system (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

october/system (Packagist): upgrade to 4.1.10 or later
```
composer require october/system:^4.1.10
```

Affected products

Octobercms October
october/system (Packagist) ECOSYSTEM:introduced=4.0.0,fixed=4.1.10

Identifiers

CVE-2026-24906
GHSA-6qmh-j78v-ffp7

References

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