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MEDIUM severity

October CMS Vulnerable to Stored XSS via Editor and Branding StylesGHSA-gxxc-m74c-f48x

MEDIUM

GHSA-gxxc-m74c-f48x is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in october/system. A fix is available for october/system — see the affected versions and patch details below.

Also known asCVE-2025-61674
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • A successful exploit gives an attacker total control of the affected component, not partial access.
  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-gxxc-m74c-f48x.

EPSS Exploitation Probability

via FIRST.org ↗
0.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs20th percentile — riskier than 20% of all scored CVEsHighest risk
0.00%0.26%0.52%0.78%0.1%0.3%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected
🐘october/system🐘october/system

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

A cross-site scripting (XSS) vulnerabilities was identified in October CMS backend configuration forms:

  • Editor Settings Markup Styles
    A user with the Global Editor Settings permission could inject malicious HTML/JS into the stylesheet input at
    Settings → Editor Settings → Markup Styles.

A specially crafted input could break out of the intended <style> context, allowing arbitrary script execution across backend pages for all users.

Impact

  • Persistent XSS across the backend interface.
  • Exploitable by lower-privileged accounts with the above permissions.
  • Potential consequences include privilege escalation, session hijacking, and execution of unauthorized actions in victim sessions.

Patches

The vulnerability has been patched in v4.0.12 and v3.7.13.
Stylesheet inputs are now sanitized to prevent injection of arbitrary HTML/JS.

All users are strongly encouraged to upgrade to the latest patched version.

Workarounds

If upgrading immediately is not possible:

  • Restrict the permissions Global Editor Settings to fully trusted administrators only.

This reduces exposure but does not fully eliminate risk.

Credits

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistoctober/systemall versions3.7.13composer require october/system:^3.7.13
🐘Packagistoctober/system≥ 4.0.0&&< 4.0.124.0.12composer require october/system:^4.0.12

Affected Products

1 product · 2 configurations
Application
octoberoctobercms
≥ 4.0.0 && < 4.0.12
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for october/system, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update october/system to 3.7.13 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-gxxc-m74c-f48x is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

A cross-site scripting (XSS) vulnerabilities was identified in October CMS backend configuration forms: - **Editor Settings Markup Styles** A user with the `Global Editor Settings` permission could inject malicious HTML/JS into the stylesheet input at *Settings → Editor Settings → Markup Styles*. A specially crafted input could break out of the intended `<style>` context, allowing arbitrary script execution across backend pages for all users. --- ### Impact - Persistent XSS across the backend interface. - Exploitable by lower-privileged accounts with the above permissions.
O3 Security · Impact-Aware SCA

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October CMS Vulnerable to Stored XSS via Editor and…