CVE-2026-25133

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 SVG sanitization logic. The regex pattern used to strip event handler attributes (such as onclick or onload) could be bypassed using a crafted payload that exploits how the pattern matches attribute boundaries, allowing malicious SVG files to be uploaded through the Media Manager with embedded JavaScript. Exploitation could lead to privilege escalation if a superuser views or embeds the malicious SVG, and requires authenticated backend access with media upload permissions. The SVG must be viewed or embedded in a page for the payload to trigger. This issue has been fixed in versions 3.7.14 and 4.1.10.

CVSS v3 4.8 MEDIUM

4.8^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.7 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required HIGH

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/octobercms/october/security/advisories/GHSA-gcqv-f29m-67gr	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:octobercms:october::::::::
	cpe:2.3:a:octobercms:october::::::::

History

23 Apr 2026, 17:50

Type	Values Removed	Values Added
CPE		cpe:2.3:a:octobercms:october::::::::
References	~~() https://github.com/octobercms/october/security/advisories/GHSA-gcqv-f29m-67gr -~~	() https://github.com/octobercms/october/security/advisories/GHSA-gcqv-f29m-67gr - Vendor Advisory
First Time		Octobercms october Octobercms
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 4.8

14 Apr 2026, 21:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-04-14 21:16

Updated : 2026-04-23 17:50

NVD link : CVE-2026-25133

Mitre link : CVE-2026-25133

CVE.ORG link : CVE-2026-25133

JSON object : View

Products Affected

octobercms

october

CWE

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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