Vulnerability · Published Oct 28, 2026 · Assigned by WSO2
CVE-2026-11854Cross-Site Scripting via Authentication Endpoint Error Message in Multiple WSO2 Products
Medium 6.1
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 0.2% (higher than 12% of all known vulnerabilities).
Official description
The authentication endpoint generates an error message that includes reflected data directly from the request without sufficient sanitization or encoding. This allows an attacker to inject malicious scripts that can be executed in the context of a victim's browser. Successful exploitation enables an attacker to perform actions within the user's browser, such as redirecting the user to a malicious website, modifying the web page's user interface, or retrieving information. However, due to the httpOnly flag on session-related cookies, session hijacking or similar attacks are not possible.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| WSO2 | WSO2 API Manager | 3.2.0 – before 3.2.0.4803.2.1 – before 3.2.1.994.1.0 – before 4.1.0.2654.2.0 – before 4.2.0.2054.3.0 – before 4.3.0.1174.4.0 – before 4.4.0.804.5.0 – before 4.5.0.65 |
| WSO2 | WSO2 API Control Plane | 4.5.0 – before 4.5.0.664.6.0 – before 4.6.0.304.7.0 – before 4.7.0.1 |
| WSO2 | WSO2 Identity Server | 5.10.0 – before 5.10.0.3995.11.0 – before 5.11.0.4466.0.0 – before 6.0.0.2726.1.0 – before 6.1.0.2747.0.0 – before 7.0.0.1557.1.0 – before 7.1.0.657.2.0 – before 7.2.0.26 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N