Known exploited vulnerability · CISA KEV

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

WSO2 API Control Plane, API Manager, Traffic Manager & Universal Gateway contain a path traversal vulnerability that could allow for unrestricted file upload and lead to remote code execution.

CVE-2026-5430

Exploited in the wild. Fix this first.

CISA added it to the Known Exploited Vulnerabilities catalog on 2026-09-24: attackers are using it right now.

CISA KEV: Listed; Added 2026-09-24 · federal fix-by 2026-09-27
EPSS (30 days): 22%; Higher than 98% of CVEs · 2026-11-01
CVSS v3.1: 10.0 Critical; CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

What CISA says

WSO2 Multiple Products Path Traversal Vulnerability

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.

NVD description · published 2026-08-06

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.

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How to check if you are exposed to CVE-2026-5430

Find every WSO2 Multiple Products system you or your clients run, including ones exposed to the internet. Those come first: CISA only lists flaws attackers are already using.
Compare each version with the fixed versions in the vendor advisory below. Where no fix exists yet, apply the vendor’s mitigation or take the system off the internet.
Run a credentialed vulnerability scan to catch the systems you missed, then check that the next scan no longer reports CVE-2026-5430.

US federal agencies had to fix this by 2026-09-27. Everyone else should treat that deadline as a guide: if it has passed, this is overdue.

Affected versions

Versions the National Vulnerability Database lists as vulnerable to CVE-2026-5430. Check the vendor advisory for the exact fixed builds before you sign anything off.

Product	Vulnerable versions
WSO2 API Control Plane	from 4.5.0 before 4.5.0.58; from 4.6.0 before 4.6.0.22
WSO2 API Manager	from 4.1.0 before 4.1.0.257; from 4.2.0 before 4.2.0.197; from 4.3.0 before 4.3.0.108; from 4.4.0 before 4.4.0.72; from 4.5.0 before 4.5.0.57; from 4.6.0 before 4.6.0.21
WSO2 Traffic Manager	from 4.5.0 before 4.5.0.56; from 4.6.0 before 4.6.0.21
WSO2 Universal Gateway	from 4.5.0 before 4.5.0.57; from 4.6.0 before 4.6.0.21

Timeline

2026-08-06 · Published in the National Vulnerability Database
2026-09-24 · Added to CISA's Known Exploited Vulnerabilities catalog, 49 days after it was published
2026-09-27 · Fix-by date for US federal agencies, passed 35 days ago

Vendor advisories and fixes

https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5328/

Weakness type

CWE-347

More exploited WSO2 vulnerabilities

CISA lists 2 exploited WSO2 vulnerabilities. The closest matches:

CVE-2022-29464WSO2 Multiple Products Unrestrictive Upload of File VulnerabilityAdded 2022-04-25

Keep going

Sources: CISA Known Exploited Vulnerabilities catalog (version 2026.10.30); EPSS data from FIRST.org; CVSS and descriptions from the NIST National Vulnerability Database. Checked 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.