---
title: "CVE-2026-5430: WSO2 Multiple Products Path Traversal Vulnerability "
url: https://erroneo.us/security/cve/CVE-2026-5430/
description: "CVE-2026-5430 (WSO2 Multiple Products): Exploited in the wild (CISA KEV). The JWT authentication mechanism accepts tokens signed with algorithms other than…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-08-06
date_modified: 2026-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-5430"
kev: true
cvss: 10
epss: 0.00588
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-5430: WSO2 Multiple Products Path Traversal Vulnerability 

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run WSO2 Multiple Products. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-09-24, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-09-27 ; treat that as the outer limit, not the target.
- EPSS 0.6% , percentile 47: FIRST’s model estimates a 0.6% chance of exploitation activity in the next 30 days, higher than 47% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Editorial verdict: Act now. WSO2 API Manager CVE-2026-5430: Exploited JWT Auth Bypass — Any self-managed WSO2 API Manager 4.1-4.6, API Control Plane, Traffic Manager or Universal Gateway below the fixed update level should be patched now and checked for forged-token use; attackers have been sending forged admin JWTs since mid-September.

## What it is

The JWT authentication mechanism accepts tokens signed with algorithms other than those explicitly configured or supported. This allows an attacker to craft a JWT with an unsupported algorithm, which is then incorrectly validated, leading to unauthorized access. Successful exploitation of this vulnerability may result in unauthorized access to the system, including the potential compromise of administrative accounts and full account takeover. The CVSS score is adjusted to 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) in single-tenant deployments, reflecting that the impact is contained within a single security authority boundary.

## Affected products (CVE record)

- WSO2 WSO2 Universal Gateway: 4.5.0 < 4.5.0.57, 4.6.0 < 4.6.0.21
- WSO2 WSO2 Traffic Manager: 4.5.0 < 4.5.0.56, 4.6.0 < 4.6.0.21
- WSO2 WSO2 API Control Plane: 4.5.0 < 4.5.0.58, 4.6.0 < 4.6.0.22
- WSO2 WSO2 API Manager: 4.1.0 < 4.1.0.257, 4.2.0 < 4.2.0.197, 4.3.0 < 4.3.0.108, 4.4.0 < 4.4.0.72, 4.5.0 < 4.5.0.57, 4.6.0 < 4.6.0.21
- WSO2 WSO2 Carbon API Manager Rest API Utility: 9.20.74 < 9.20.74.401, 9.28.116 < 9.28.116.417, 9.29.120 < 9.29.120.236, 9.30.67 < 9.30.67.167, 9.31.86 < 9.31.86.158, 9.32.147 < 9.32.147.59

## Severity

- WSO2 CVSS 3.1: 10 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2026-09-24; federal due date 2026-09-27. Known ransomware use: Unknown.
- CISA required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.59% probability of exploitation activity in the next 30 days; percentile 47.

## Sources

- [security.docs.wso2.com](https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5328/)
- [CVE.org record CVE-2026-5430](https://www.cve.org/CVERecord?id=CVE-2026-5430)
- [NVD entry CVE-2026-5430](https://nvd.nist.gov/vuln/detail/CVE-2026-5430)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-5430)
- [Listed in CISA KEV notes (cisa.gov)](https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk)
- [Listed in CISA KEV notes (cisa.gov)](https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk)

---
Source page: https://erroneo.us/security/cve/CVE-2026-5430/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt