CVE-2026-5430
KEV: known exploited SSVC: activeAuthentication Bypass via JWT Algorithm Mismatch in Multiple WSO2 Products Allows Account Takeover
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack conditions and impact
Derived from the CNA (via NVD) CVSS 3.1 vectorThis vulnerability may be exploitable over the internet without authentication or user interaction.
| Metric | Value | Meaning |
|---|---|---|
| Attack vector AV | N | Network |
| Attack complexity AC | L | Low (easy) |
| Privileges required PR | N | None |
| User interaction UI | N | None |
| Scope S | C | Changed (affects other components) |
| Confidentiality C | H | High |
| Integrity I | H | High |
| Availability A | H | High |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
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.
Solutions (CNA)
Follow the instructions given on https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5328/#solution https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5328/#solution
CISA KEV entry
WSO2 Multiple Products Path Traversal Vulnerability — WSO2 / Multiple Products
WSO2 API Control Plane, API Manager, Traffic Manager & Universal Gateway contain a path traversal vulnerability that could allow for unrestricted file upload and lead to remote code execution.
Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5328/ ; ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-5430
CVSS assessments
| Provider | Version | Score | Vector |
|---|---|---|---|
| NVD / ed10eef1-636d-4fbe-9993-6890dfa878f8 (Secondary) | 3.1 | 10.0 CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| CNA / WSO2 | 3.1 | 10.0 CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
Affected products and packages
CNA (CVE.org)
| Vendor | Product | Versions |
|---|---|---|
| WSO2 | WSO2 Universal Gateway | affected: 4.5.0 … < 4.5.0.57 affected: 4.6.0 … < 4.6.0.21 default: unaffected |
| WSO2 | WSO2 Traffic Manager | affected: 4.5.0 … < 4.5.0.56 affected: 4.6.0 … < 4.6.0.21 default: unaffected |
| WSO2 | WSO2 API Control Plane | affected: 4.5.0 … < 4.5.0.58 affected: 4.6.0 … < 4.6.0.22 default: unaffected |
| WSO2 | WSO2 API Manager | unknown: 0 … < 4.1.0 affected: 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 default: unaffected |
| WSO2 | WSO2 Carbon API Manager Rest API Utility | affected: 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 unaffected: 9.33.106 … <= * default: unknown |
NVD CPE (12)
Show CPE list
| Vendor | Product | Range | CPE |
|---|---|---|---|
| wso2 | api_control_plane | >= 4.5.0, < 4.5.0.58 | cpe:2.3:a:wso2:api_control_plane:*:*:*:*:*:*:*:* |
| wso2 | api_control_plane | >= 4.6.0, < 4.6.0.22 | cpe:2.3:a:wso2:api_control_plane:*:*:*:*:*:*:*:* |
| wso2 | api_manager | >= 4.1.0, < 4.1.0.257 | cpe:2.3:a:wso2:api_manager:*:*:*:*:*:*:*:* |
| wso2 | api_manager | >= 4.2.0, < 4.2.0.197 | cpe:2.3:a:wso2:api_manager:*:*:*:*:*:*:*:* |
| wso2 | api_manager | >= 4.3.0, < 4.3.0.108 | cpe:2.3:a:wso2:api_manager:*:*:*:*:*:*:*:* |
| wso2 | api_manager | >= 4.4.0, < 4.4.0.72 | cpe:2.3:a:wso2:api_manager:*:*:*:*:*:*:*:* |
| wso2 | api_manager | >= 4.5.0, < 4.5.0.57 | cpe:2.3:a:wso2:api_manager:*:*:*:*:*:*:*:* |
| wso2 | api_manager | >= 4.6.0, < 4.6.0.21 | cpe:2.3:a:wso2:api_manager:*:*:*:*:*:*:*:* |
| wso2 | traffic_manager | >= 4.5.0, < 4.5.0.56 | cpe:2.3:a:wso2:traffic_manager:*:*:*:*:*:*:*:* |
| wso2 | traffic_manager | >= 4.6.0, < 4.6.0.21 | cpe:2.3:a:wso2:traffic_manager:*:*:*:*:*:*:*:* |
| wso2 | universal_gateway | >= 4.5.0, < 4.5.0.57 | cpe:2.3:a:wso2:universal_gateway:*:*:*:*:*:*:*:* |
| wso2 | universal_gateway | >= 4.6.0, < 4.6.0.21 | cpe:2.3:a:wso2:universal_gateway:*:*:*:*:*:*:*:* |
Linux distribution status
References (2)
- https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5328/ NVD, CNA Vendor Advisoryvendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-5430 NVD, ADP CISA-ADP US Government Resourcegovernment-resource