Vulnerability · Published Sep 14, 2026 · Assigned by WSO2
CVE-2026-4103Cross-Site Scripting via HTML Sanitization in WSO2 Publisher and Developer Portals Allows Malicious Script Execution
Medium 6.4
In plain English
A medium-severity cross-site scripting in WSO2 API Control Plane from WSO2. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities).
Official description
Insufficient HTML sanitization in the Publisher Portal and Developer Portal allows untrusted user input to be rendered without proper encoding or neutralization. This enables the injection and execution of malicious JavaScript when affected API documents are viewed. Successful exploitation may result in the execution of malicious scripts within the user's browser context when viewing API documentation. Users with permissions to access the API documentation through these portals may be impacted, potentially allowing attackers to perform actions on behalf of the user, depending on their session privileges.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| WSO2 | WSO2 API Control Plane | 4.5.0 – before 4.5.0.554.6.0 – before 4.6.0.19 |
| WSO2 | WSO2 API Manager | 3.2.0 – before 3.2.0.4703.2.1 – before 3.2.1.894.1.0 – before 4.1.0.2544.2.0 – before 4.2.0.1944.3.0 – before 4.3.0.1054.4.0 – before 4.4.0.694.5.0 – before 4.5.0.54 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N