CVE-2026-5430Authentication Bypass via JWT Algorithm Mismatch in Multiple WSO2 Products Allows Account Takeover
Updated under an hour ago ()
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It affects WSO2 Universal Gateway and 4 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Sep 24, 2026; federal agencies had to remediate by Sep 27, 2026. Treat that date as your deadline.
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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
- 10.0 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- Weakness (CWE)
- CWE-347
- Known exploited
- Added to CISA KEV Sep 24, 2026; federal remediation due Sep 27, 2026Apply 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.
- EPSS (exploitation in the next 30 days)
- 0.59% (percentile 47)
- Assigned by
- WSO2
- NVD analysis
- Analyzed
- Record last updated
- Sep 25, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
WSO2 WSO2 Universal Gateway wso2:universal_gateway (from the name) | from 4.5.0 before 4.5.0.57; from 4.6.0 before 4.6.0.21 | CNA record |
WSO2 WSO2 Traffic Manager wso2:traffic_manager (from the name) | from 4.5.0 before 4.5.0.56; from 4.6.0 before 4.6.0.21 | CNA record |
WSO2 WSO2 API Control Plane wso2:api_control_plane (from the name) | from 4.5.0 before 4.5.0.58; from 4.6.0 before 4.6.0.22 | CNA record |
WSO2 WSO2 API Manager wso2:api_manager (from the name) | before 4.1.0 status unknown; from 4.1.0 before 4.1.0.257; from 4.2.0 before 4.2.0.197; from 4.3.0 before 4.3.0.108; from 4.4.0 before 4.4.0.72; from 4.5.0 before 4.5.0.57; from 4.6.0 before 4.6.0.21 | CNA record |
WSO2 WSO2 Carbon API Manager Rest API Utility wso2:carbon_api_manager_rest_api_utility (from the name) | from 9.20.74 before 9.20.74.401; from 9.28.116 before 9.28.116.417; from 9.29.120 before 9.29.120.236; from 9.30.67 before 9.30.67.167; from 9.31.86 before 9.31.86.158; from 9.32.147 before 9.32.147.59; from 9.33.106 not affected | CNA record |
wso2 api_control_plane wso2:api_control_plane | from 4.5.0 before 4.5.0.58; from 4.6.0 before 4.6.0.22 | NVD |
wso2 api_manager wso2:api_manager | from 4.1.0 before 4.1.0.257; from 4.2.0 before 4.2.0.197; from 4.3.0 before 4.3.0.108; from 4.4.0 before 4.4.0.72; from 4.5.0 before 4.5.0.57; from 4.6.0 before 4.6.0.21 | NVD |
wso2 traffic_manager wso2:traffic_manager | from 4.5.0 before 4.5.0.56; from 4.6.0 before 4.6.0.21 | NVD |
wso2 universal_gateway wso2:universal_gateway | from 4.5.0 before 4.5.0.57; from 4.6.0 before 4.6.0.21 | NVD |
References
- https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5328/vendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-5430us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.