Vulnerability Intelligence Report
Authentication Bypass via JWT Algorithm Mismatch in Multiple WSO2 Products Allows Account Takeover
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.
No Active Exploit Signals
CVSS Base Score
10.0
CRITICAL
Exploitability:3.9
Impact Score:6.1
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-347 ↗CWE-347: Improper Validation of Certificate With Host Mismatch
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| WSO2 | WSO2 Universal Gateway | 4.5.0 < 4.5.0.57 (affected), 4.6.0 < 4.6.0.21 (affected) |
| WSO2 | WSO2 Traffic Manager | 4.5.0 < 4.5.0.56 (affected), 4.6.0 < 4.6.0.21 (affected) |
| WSO2 | WSO2 API Control Plane | 4.5.0 < 4.5.0.58 (affected), 4.6.0 < 4.6.0.22 (affected) |
| WSO2 | WSO2 API Manager | 0 < 4.1.0 (unknown), 4.1.0 < 4.1.0.257 (affected), 4.2.0 < 4.2.0.197 (affected), 4.3.0 < 4.3.0.108 (affected), 4.4.0 < 4.4.0.72 (affected), 4.5.0 < 4.5.0.57 (affected), 4.6.0 < 4.6.0.21 (affected) |
| WSO2 | WSO2 Carbon API Manager Rest API Utility | 9.20.74 < 9.20.74.401 (affected), 9.28.116 < 9.28.116.417 (affected), 9.29.120 < 9.29.120.236 (affected), 9.30.67 < 9.30.67.167 (affected), 9.31.86 < 9.31.86.158 (affected), 9.32.147 < 9.32.147.59 (affected), 9.33.106 <= * (unaffected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | WSO2 LLC · Vendor · USA |
| Reserved | 2026-04-02T16:11:32 |
| Published | 2026-08-06T07:33:28 |
| Last Updated | 2026-08-06T12:30:55 |
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