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CVE-2026-4103

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

Medium6.4EPSS 0.30%
Published
Updated
Reserved
Assigned by
WSO2

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 scores of CVE-2026-4103, by who scored it
Scored byCVSSScoreVector
WSO2CNA (assigner)3.1Medium6.4CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
NVDNVD · Deferred3.1Medium6.4CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
EPSS (exploitation in 30 days)
0.30% · top 77% of all CVEs (5 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.4.

Weakness

Affected products

  • WSO2 · WSO2 API Control Plane

    • affected 4.5.0 – < 4.5.0.55
    • affected 4.6.0 – < 4.6.0.19

  • WSO2 · WSO2 API Manager

    • unknown < 3.2.0
    • affected 3.2.0 – < 3.2.0.470
    • affected 3.2.1 – < 3.2.1.89
    • affected 4.1.0 – < 4.1.0.254
    • affected 4.2.0 – < 4.2.0.194
    • affected 4.3.0 – < 4.3.0.105
    • affected 4.4.0 – < 4.4.0.69
    • affected 4.5.0 – < 4.5.0.54
    • affected 4.6.0 – < 4.6.0.18

What to do

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

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

CVE-2026-4103 badge
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Record last updated .