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Vulnerability · Published Apr 14, 2026 · Assigned by GitHub_M

CVE-2026-24907October CMS has Stored XSS via Event Log Mail Preview

Medium 5.1

In plain English

A medium-severity cross-site scripting in october from octobercms. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)5.1Medium
Exploit odds (30 days)0.2%top 90.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 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. This issue has been fixed in versions 3.7.14 and 4.1.10. If users are unable to update immediately, workarounds include restricting mail template editing permissions to fully trusted administrators only and restricting Event Log viewing permissions to minimize exposure.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Packagistoctober/system4.1.10GHSA-j4j5-9x6g-rgxc
Packagistoctober/system3.7.14GHSA-j4j5-9x6g-rgxc

Affected products (as reported)

VendorProductVersions
octobercms october < 3.7.14>= 4.0.0, < 4.1.10

Weakness: CWE-79 · 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

References