CVE-2026-4103 Cross-Site Scripting via HTML Sanitization in WSO2 Publisher and Developer Portals Allows Malicious Script Execution
Attackers can inject malicious scripts into API documentation viewed in WSO2 Publisher and Developer Portals, potentially hijacking user sessions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4103?
CVE-2026-4103 is a medium-severity cross-site scripting vulnerability in WSO2 API Control Plane, published on 14 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-4103?
How do I fix CVE-2026-4103?
No fix has been published for CVE-2026-4103 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-4103 being exploited?
There is no known exploitation of CVE-2026-4103 in the wild and no public exploit code.
Sources
Also known as GHSA-wfvc-6jjf-4g5g.