CVE-2026-4103

Cross-Site Scripting via HTML Sanitization in WSO2 Publisher and Developer Portals Allows Malicious Script Execution

State: Published
Severity: 6.4 Medium
Published: Sep 14, 2026
Updated: Sep 14, 2026
Reserved: Mar 13, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	6.4 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N	WSO2

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected Products

Product	Versions
WSO2 API Control PlaneWSO2	4.5.0 to before 4.5.0.55Affected 4.6.0 to before 4.6.0.19Affected
WSO2 API ManagerWSO2	before 3.2.0Unknown 3.2.0 to before 3.2.0.470Affected 3.2.1 to before 3.2.1.89Affected 4.1.0 to before 4.1.0.254Affected 4.2.0 to before 4.2.0.194Affected 4.3.0 to before 4.3.0.105Affected 4.4.0 to before 4.4.0.69Affected 4.5.0 to before 4.5.0.54Affected 4.6.0 to before 4.6.0.18Affected

References

https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-4844/vendor-advisory

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