Stored Cross-Site Scripting Vulnerability in October CMS by October
CVE-2026-25133

4.8MEDIUM

Key Information:

Vendor

Octobercms

Status
October
Vendor
CVE Published:
14 April 2026

What is CVE-2026-25133?

October CMS prior to versions 3.7.14 and 4.1.10 has a vulnerability in the SVG sanitization logic that allows for stored cross-site scripting (XSS). This occurs through a flaw in the regex pattern used to remove event handler attributes from SVGs, making it possible for an attacker to upload malicious SVG files via the Media Manager, containing embedded JavaScript. If a superuser views or embeds these crafted SVGs, it could potentially escalate privileges. The vulnerability requires authenticated backend access with media upload permissions to exploit, and users must view or embed the malicious SVG for the attack to be executed. This issue has been rectified in the aforementioned versions.

Affected Version(s)

october < 3.7.14 < 3.7.14

october >= 4.0.0, < 4.1.10 < 4.0.0, 4.1.10

References

https://github.com/octobercms/october/security/advisories...
x_refsource_CONFIRM

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.