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