What is CVE-2024-5139?

CVE-2024-5139 is a medium-severity vulnerability in Wso2 API Manager, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-10-21.

How severe is CVE-2024-5139?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Wso2 API Manager

CVE-2024-5139

The Authentication Endpoint accepts user-supplied input without sufficient encoding, allowing for the injection of malicious JavaScript payloads. This vulnerability can be triggered by submitting crafted input to the Authentication Endpoint. Successful exploitation allows an attacker to redirect the user's browser to a malicious website, modify the web page's user interface, or extract sensitive information from the browser. However, due to the `httpOnly` flag on session-related cookies, session hijacking is not possible.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-10-21 · last modified 2026-10-21.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

ed10eef1-636d-4fbe-9993-6890dfa878f8 (vendor-advisory)
ed10eef1-636d-4fbe-9993-6890dfa878f8 (patch)
ed10eef1-636d-4fbe-9993-6890dfa878f8 (patch)

Frequently asked questions

What is CVE-2024-5139?: CVE-2024-5139 is a medium-severity vulnerability in Wso2 API Manager, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-10-21.
How severe is CVE-2024-5139?: Medium severity. CVSS v3 base score is 6.1 out of 10.