CVE-2026-4103CWE-79cross-site-scripting

CVE-2026-4103

Medium · published September 14, 2026

CVSS v3.1
6.4
EPSS
0%
Percentile
21.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00301 · 21.6th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-09-14T20:17Z
References (1)
EPSS history
Timeline
  • 16 SEP 04:28Z
    EPSS moved — → 0%
    epss
  • 14 SEP 15:54Z
    Cross-Site Scripting via HTML Sanitization in WSO2 Publisher and Developer Portals Allows Malicious Script Execution
    cvelistv5