CVE-2026-4103

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

Published: Sep 14, 2026Updated: Sep 18, 2026 Sources: CVE List NVDCWE-79

6.4MEDIUM

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:LPrivileges Required

Low

UI:NUser Interaction

None

Scope

S:CScope

Changed

Impact

C:LConfidentiality

Low

I:LIntegrity

Low

A:NAvailability

None

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Weaknesses

CWE-79

Affected Products

WSO2

commercial·IN

WSO2 API Control PlaneOn-premWeb App

Cloud & SaaS / api-gateway

WSO2 API ManagerOn-prem

Cloud & SaaS / api-gateway

Exploitability

Official Patch Available

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques

Execution

Initial Access

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References

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

security.docs.wso2.com

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