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GHSA-gxxc-m74c-f48x

MediumCVSS 6.1 / 10
Published Jan 9, 2026·Last modified Feb 3, 2026
Affected Components(0)

No affected components available

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

Risk Scores
Base Score
6.1

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs high-level or administrative privileges. The attacker needs the user to perform some action, like clicking a link. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data.

Threat Intelligence
5.6

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.18%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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