Vulnerability details
CVE-2026-5430
Actively exploited
WSO2 API Control PlaneWSO2 API ManagerWSO2 Carbon API Manager Rest API UtilityWSO2 Traffic ManagerWSO2 Universal Gateway
Authentication Bypass via JWT Algorithm Mismatch in Multiple WSO2 Products Allows Account Takeover
CVSS 3.1
10.0Critical
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 10.0Critical | 3.1 | CVEProject cvelistV5 (CNA) (WSO2) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| WSO2 | WSO2 API Control Plane | 4.5.0 ≤ v < 4.5.0.58 | CVEProject cvelistV5 (CNA) |
| WSO2 | WSO2 API Control Plane | 4.6.0 ≤ v < 4.6.0.22 | CVEProject cvelistV5 (CNA) |
| WSO2 | WSO2 API Manager | v < 4.1.0 | CVEProject cvelistV5 (CNA) |
| WSO2 | WSO2 API Manager | 4.1.0 ≤ v < 4.1.0.257 | CVEProject cvelistV5 (CNA) |
| WSO2 | WSO2 API Manager | 4.2.0 ≤ v < 4.2.0.197 | CVEProject cvelistV5 (CNA) |
| WSO2 | WSO2 API Manager | 4.3.0 ≤ v < 4.3.0.108 | CVEProject cvelistV5 (CNA) |
| WSO2 | WSO2 API Manager | 4.4.0 ≤ v < 4.4.0.72 | CVEProject cvelistV5 (CNA) |
| WSO2 | WSO2 API Manager | 4.5.0 ≤ v < 4.5.0.57 | CVEProject cvelistV5 (CNA) |
| WSO2 | WSO2 API Manager | 4.6.0 ≤ v < 4.6.0.21 | CVEProject cvelistV5 (CNA) |
| WSO2 | WSO2 Carbon API Manager Rest API Utility | 9.20.74 ≤ v < 9.20.74.401 | CVEProject cvelistV5 (CNA) |
| WSO2 | WSO2 Carbon API Manager Rest API Utility | 9.28.116 ≤ v < 9.28.116.417 | CVEProject cvelistV5 (CNA) |
| WSO2 | WSO2 Carbon API Manager Rest API Utility | 9.29.120 ≤ v < 9.29.120.236 | CVEProject cvelistV5 (CNA) |
| WSO2 | WSO2 Carbon API Manager Rest API Utility | 9.30.67 ≤ v < 9.30.67.167 | CVEProject cvelistV5 (CNA) |
| WSO2 | WSO2 Carbon API Manager Rest API Utility | 9.31.86 ≤ v < 9.31.86.158 | CVEProject cvelistV5 (CNA) |
| WSO2 | WSO2 Carbon API Manager Rest API Utility | 9.32.147 ≤ v < 9.32.147.59 | CVEProject cvelistV5 (CNA) |
| WSO2 | WSO2 Traffic Manager | 4.5.0 ≤ v < 4.5.0.56 | CVEProject cvelistV5 (CNA) |
| WSO2 | WSO2 Traffic Manager | 4.6.0 ≤ v < 4.6.0.21 | CVEProject cvelistV5 (CNA) |
| WSO2 | WSO2 Universal Gateway | 4.5.0 ≤ v < 4.5.0.57 | CVEProject cvelistV5 (CNA) |
| WSO2 | WSO2 Universal Gateway | 4.6.0 ≤ v < 4.6.0.21 | CVEProject cvelistV5 (CNA) |
References and advisories
2
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Details
- Published
- 2026-08-06
- Last updated
- 2026-09-25
- State
- Published
- Assigner (CNA)
- WSO2
- Kolun priority
- 79 · High
CISA KEV catalog
- Date added
- 2026-09-24
- Due date
- 2026-09-27
- Used in ransomware
- Unknown
Exploit prediction (EPSS)
22.39%
Probability of exploitation in 30 days
97.6%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Active
- Technical impact
- Total
Weaknesses (CWE)
- CWE-347Improper Validation of Certificate With Host Mismatch