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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-4103
StatePUBLISHED
AssignerWSO2
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-14 16:17:11 UTC
Updated2026-09-18 19:13:15 UTC
DescriptionInsufficient 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.

Risk And Classification

Primary CVSS: v3.1 6.4 MEDIUM from ed10eef1-636d-4fbe-9993-6890dfa878f8

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

EPSS: 0.001800000 probability, percentile 0.078320000 (date 2026-09-21)

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

VersionSourceTypeScoreSeverityVector
3.1ed10eef1-636d-4fbe-9993-6890dfa878f8Secondary6.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
3.1CNACVSS6.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA WSO2 WSO2 API Control Plane affected 4.5.0 4.5.0.55 custom Not specified
CNA WSO2 WSO2 API Control Plane affected 4.6.0 4.6.0.19 custom Not specified
CNA WSO2 WSO2 API Manager unknown 3.2.0 custom Not specified
CNA WSO2 WSO2 API Manager affected 3.2.0 3.2.0.470 custom Not specified
CNA WSO2 WSO2 API Manager affected 3.2.1 3.2.1.89 custom Not specified
CNA WSO2 WSO2 API Manager affected 4.1.0 4.1.0.254 custom Not specified
CNA WSO2 WSO2 API Manager affected 4.2.0 4.2.0.194 custom Not specified
CNA WSO2 WSO2 API Manager affected 4.3.0 4.3.0.105 custom Not specified
CNA WSO2 WSO2 API Manager affected 4.4.0 4.4.0.69 custom Not specified
CNA WSO2 WSO2 API Manager affected 4.5.0 4.5.0.54 custom Not specified
CNA WSO2 WSO2 API Manager affected 4.6.0 4.6.0.18 custom Not specified

References

ReferenceSourceLinkTags
security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO... ed10eef1-636d-4fbe-9993-6890dfa878f8 security.docs.wso2.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: San Gil from Security Office (en)

Additional Advisory Data

Solutions

CNA: Follow the instructions given on https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-4844/#solution

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