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CVE-2026-5430

WSO2 Multiple Products•CRITICAL · CVSS 10• In the wild In CISA KEV

What is CVE-2026-5430?

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.

CVSS10 NVD 3.1

SeverityCRITICAL

Exploitation In the wild In CISA KEV

EPSS22% · P98

Triage statusActive Exploit

ActionPatch immediately

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CWECWE-347

NVD published2026-08-06

NVD last modified2026-09-25

Timeline

2026-08-06Published to the U.S. National Vulnerability Database (NVD)
2026-09-24Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
2026-09-25First covered in a defend.network daily briefing
2026-09-25NVD record last updated
2026-09-27CISA federal remediation deadline (BOD 22-01)

CISA Known Exploited Vulnerability

WSO2 Multiple Products Path Traversal Vulnerability

Added to KEV2026-09-24

Federal patch deadline2026-09-27

Known ransomware useUnknown

Affected product

WSO2 Multiple Products

NVD also lists CPE entries for: Wso2 Api Control Plane, Wso2 Api Manager, Wso2 Traffic Manager, Wso2 Universal Gateway

Remediation Steps

Apply available patches from GitHub
Review GitHub repository access logs for unauthorized activity
Audit repository permissions and access controls
Monitor for credential compromise or token abuse

References

Referenced in our briefings & reports

Vulnerability Priority Report – Week 3 of October 2026 (October 19 – 25)
Vulnerability Priority Report – Week 2 of October 2026 (October 12 – 18)
Vulnerability Priority Report – Week 1 of October 2026 (October 5 – 11)
Vulnerability Priority Report – Week 4 of September 2026 (September 28 – October 4)
Vulnerability Priority Report – Week 3 of September 2026 (September 21 – 27)
GitHub Actions re-compromised; North Korea suspected in $351M Bitget heist (2026-09-26)
Microsoft, WSO2, Adobe vulnerabilities under active exploitation; Roundcube actively abused (2026-09-25)

Related vulnerabilities

CVE-2026-76482 (same weakness: CWE-347)
CVE-2026-76581 (same weakness: CWE-347)
CVE-2026-48558 – Simple-Help Simplehelp (same weakness: CWE-347)

Browse all tracked CVEs in the defend.network CVE database →

🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.