Vulnerability in Wso2 API Control Plane
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.224 (97.7th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 97.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.224 · change: +0.218
Affected products
- Wso2 API Control Plane
- Wso2 API Manager
- Wso2 Traffic Manager
- Wso2 Universal Gateway
- Wso2 API Control Plane — versions 4.5.0, 4.6.0
- Wso2 API Manager — versions 0, 4.1.0, 4.2.0
- Wso2 Carbon API Manager Rest Utility — versions 9.20.74, 9.28.116, 9.29.120
- Wso2 Traffic Manager — versions 4.5.0, 4.6.0
- Wso2 Universal Gateway — versions 4.5.0, 4.6.0
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
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.
Public proof-of-concept exploits
References
- ed10eef1-636d-4fbe-9993-6890dfa878f8 (vendor-advisory, Vendor Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
Frequently asked questions
- What is CVE-2026-5430?
- CVE-2026-5430 is a critical-severity vulnerability in Wso2 API Control Plane, classified under Improper Verification of Cryptographic Signature. CVSS score: 10.0/10. Published 2026-08-06.
- How severe is CVE-2026-5430?
- Critical severity. CVSS v3 base score is 10.0 out of 10.
- Is CVE-2026-5430 known to be exploited?
- Yes. CVE-2026-5430 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-09-24), indicating it is being actively exploited. 4 public proof-of-concept repositories are indexed.