CVE Intelligence
Medium Cross-site scripting

CVE-2024-5139 — Cross-Site Scripting via Authentication Endpoint in Multiple WSO2 Products Enables UI Manipulation and Redirection

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.

Published Oct 21, 2026 · Updated Oct 21, 2026 · Sources: CVE Program (cve.org) e CISA ADP, NIST National Vulnerability Database · CNA: WSO2

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.
How the score was calculated
  • Technical severity (medium)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Not confirmed
Not in CISA KEV — an absence of record, not proof it is unexploited.
EPSS FIRST
—
No EPSS score.
Affects
WSO2
Api Manager and 6 more
CVSS base
6.1
Medium · 2 source(s)

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (WSO2 Api Manager, WSO2 Enterprise Integrator, WSO2 Identity Server…).
  2. The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
  3. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
  4. Exploitation requires user interaction: tighten email/web filtering and warn affected users.
  5. Search available logs for exploit probes matching the vulnerability class (cross-site scripting), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
WSO2 Api Manager ≥ 3.2.0 and < 3.2.0.376≥ 3.2.1 and < 3.2.1.10≥ 4.0.0 and < 4.0.0.299≥ 4.1.0 and < 4.1.0.159≥ 4.2.0 and < 4.2.0.91≥ 4.3.0 and < 4.3.0.6≥ 3.1.0 and < 3.1.0.286 Vulnerable CVE Program (cve.org) e CISA ADP
WSO2 Enterprise Integrator ≥ 6.6.0 and < 6.6.0.204 Vulnerable CVE Program (cve.org) e CISA ADP
WSO2 Identity Server ≥ 5.10.0 and < 5.10.0.310≥ 6.0.0 and < 6.0.0.212≥ 6.1.0 and < 6.1.0.195≥ 7.0.0 and < 7.0.0.64 Vulnerable CVE Program (cve.org) e CISA ADP
WSO2 Identity Server As Key Manager ≥ 5.10.0 and < 5.10.0.306 Vulnerable CVE Program (cve.org) e CISA ADP
WSO2 Open Banking Am ≥ 2.0.0 and < 2.0.0.336 Vulnerable CVE Program (cve.org) e CISA ADP
WSO2 Open Banking Iam ≥ 2.0.0 and < 2.0.0.357 Vulnerable CVE Program (cve.org) e CISA ADP
WSO2 WSO2 Carbon User Management UI ≥ 5.14.127 and < 5.14.127.6≥ 5.17.5 and < 5.17.5.273≥ 5.17.118 and < 5.17.118.3≥ 5.18.187 and < 5.18.187.260≥ 5.18.248 and < 5.18.248.12≥ 5.23.8 and < 5.23.8.191≥ 5.24.8 and < 5.24.8.3≥ 5.25.92 and < 5.25.92.99
and 2 more ≥ 5.25.705 and < 5.25.705.3≥ 7.0.78 and < 7.0.78.43
Vulnerable CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactScored by
6.1 CVSS 3.1 Medium 2.8 2.7 ed10eef1-636d-4fbe-9993-6890dfa878f8 via NIST National Vulnerability Database
6.1 CVSS 3.1 Medium — — WSO2 via CVE Program (cve.org) e CISA ADP
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N (score shown at the top: ed10eef1-636d-4fbe-9993-6890dfa878f8)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-79 · Cross-site Scripting (XSS)

Other CVEs with this weakness →

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
  • Monitor CSP violation reports and script payloads in reflected parameters.
web/proxy/WAF logsnetwork IDS/IPSapplication logs

Timeline

What happened to this CVE, newest first.

  • 2026
  • Source status changed · Received → Awaiting Analysis
    Oct 21, 2026 · NIST National Vulnerability Database
  • Source status changed · Published → Received
    Oct 21, 2026 · NIST National Vulnerability Database
  • Record published
    Oct 21, 2026
  • CVSS changed · 6.1
    Oct 21, 2026 · CVE Program (cve.org) e CISA ADP
  • Source status changed · → Published
    Oct 21, 2026 · CVE Program (cve.org) e CISA ADP
  • Record created in this database
    Oct 21, 2026 · CVE Program (cve.org) e CISA ADP
  • CVE published
    Oct 21, 2026 · WSO2

Source activity

Repeated readings are counted rather than listed.

  • 1× Official description updated · Oct 21, 2026 – Oct 21, 2026

References

3 on the record

Elsewhere on this site

WSO2
every CVE for this vendor
Cross-site scripting
same class
CWE-79
other pages naming this weakness

Related CVEs (same products)

  • CVE-2025-0326 Improper Token Revocation in WSO2 Identity Server Allows Unauthorized Access 1d
  • CVE-2024-7478 Username Enumeration via External User Stores in Multiple WSO2 Products Allows User Account Discovery 1d
  • CVE-2024-5563 Incomplete reCaptcha Implementation in Authentication Flows in WSO2 Identity Server Allows Brute Force Attacks 1d
  • CVE-2024-6423 Sensitive Data Exposure via URL Parameters in Multiple WSO2 Products Allows Confidential Information Leakage 1d
  • CVE-2024-4989 Open Redirection via Callback URL in WSO2 API Manager Allows Phishing Attacks 1d
  • CVE-2024-2323 Password Brute Force via Password History Validation in Multiple WSO2 Products Allows User Account Discovery 2d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No FIRST EPSS score.
  • No fixed version, patch or mitigation documented.
  • No CISA SSVC assessment.
  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2024-5139 is "Cross-Site Scripting via Authentication Endpoint in Multiple WSO2 Products Enables UI Manipulation and Redirection", rated Medium. It affects Api Manager (WSO2); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 6.1 describes technical severity. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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