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CVE-2026-5430

Authentication Bypass via JWT Algorithm Mismatch in Multiple WSO2 Products Allows Account Takeover

Published: Aug 6, 2026Updated: Aug 6, 2026 Sources: CVE List NVDCWE-347
10.0CRITICAL
NVD MITRE
EPSS Score
0.2%
Top 87.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-347

Affected Products

WSO2
commercial·IN
WSO2 Universal GatewayOn-premSecurity Product
Security Products / secure-gateway-vpn
WSO2 Traffic ManagerOn-premNetwork Device
Networking Infrastructure / load-balancer-proxy
WSO2 API Control PlaneOn-premWeb App
Cloud & SaaS / api-gateway
WSO2 API ManagerOn-prem
Cloud & SaaS / api-gateway
WSO2 Carbon API Manager Rest API UtilityOn-premWeb App
Cloud & SaaS / api-gateway

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

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

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