GitHub Advisoryadvisory · Packagist

GHSA-j4j5-9x6g-rgxc October CMS has Stored XSS in Event Log Mail Preview

MEDIUM Published 2026-04-14 Modified 2026-04-24 Official page ↗
Aliases
CVE-2026-24907
Ecosystem
Packagist
Packages
october/system
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weaknesses
CWE-79
Reviewed
2026-04-14

Affected packages

• Packagist october/system: >= 4.0.0, < 4.1.10 → fixed in 4.1.10 • Packagist october/system: < 3.7.14 → fixed in 3.7.14

Description

A stored cross-site scripting (XSS) vulnerability was identified in the Event Log mail preview feature. When viewing logged mail messages, HTML content was rendered in an iframe without proper sandboxing, allowing JavaScript execution in the viewer's browser context. Impact • Stored XSS via mail template content rendered in Event Log • Could allow privilege escalation if a superuser views a malicious log entry • Requires authenticated backend access with mail template editing permissions • Requires a superuser to view the specific Event Log entry to trigger Patches The vulnerability has been patched in v3.7.14 and v4.1.10. All users are encouraged to upgrade to the latest patched version. Workarounds If upgrading immediately is not possible: • Restrict mail template editing permissions to fully trusted administrators only • Restrict Event Log viewing permissions to minimize exposure References • Reported by Chris Alupului

Related

Alias · CVE (1)

  • CVE-2026-24907 October is a Content Management System (CMS) and web platform. vulnerability

Weakness · CWE (1)

  • CWE-79 Improper Neutralization of Input During Web Page Generation weakness

References