CVE-2026-5430
Authentication Bypass via JWT Algorithm Mismatch in Multiple WSO2 Products Allows Account Takeover
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.
INFO
Published Date :
Aug. 6, 2026, 8:16 a.m.
Last Modified :
Aug. 6, 2026, 8:16 a.m.
Remotely Exploit :
Yes !
Source :
ed10eef1-636d-4fbe-9993-6890dfa878f8
Affected Products
The following products are affected by CVE-2026-5430
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | ed10eef1-636d-4fbe-9993-6890dfa878f8 | ||||
| CVSS 3.1 | CRITICAL | MITRE-CVE |
Solution
- Configure JWT validation to strictly enforce allowed algorithms.
- Update JWT libraries to the latest secure versions.
- Remove support for insecure or unsupported JWT algorithms.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-5430.
| URL | Resource |
|---|---|
| https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5328/ |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-5430 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-5430
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-5430 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-5430 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by ed10eef1-636d-4fbe-9993-6890dfa878f8
Aug. 06, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'WSO2', 'product': 'WSO2 Universal Gateway', 'versions': [{'status': 'affected', 'version': '4.5.0', 'lessThan': '4.5.0.57', 'versionType': 'custom'}, {'status': 'affected', 'version': '4.6.0', 'lessThan': '4.6.0.21', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}, {'vendor': 'WSO2', 'product': 'WSO2 Traffic Manager', 'versions': [{'status': 'affected', 'version': '4.5.0', 'lessThan': '4.5.0.56', 'versionType': 'custom'}, {'status': 'affected', 'version': '4.6.0', 'lessThan': '4.6.0.21', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}, {'vendor': 'WSO2', 'product': 'WSO2 API Control Plane', 'versions': [{'status': 'affected', 'version': '4.5.0', 'lessThan': '4.5.0.58', 'versionType': 'custom'}, {'status': 'affected', 'version': '4.6.0', 'lessThan': '4.6.0.22', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}, {'vendor': 'WSO2', 'product': 'WSO2 API Manager', 'versions': [{'status': 'unknown', 'version': '0', 'lessThan': '4.1.0', 'versionType': 'custom'}, {'status': 'affected', 'version': '4.1.0', 'lessThan': '4.1.0.257', 'versionType': 'custom'}, {'status': 'affected', 'version': '4.2.0', 'lessThan': '4.2.0.197', 'versionType': 'custom'}, {'status': 'affected', 'version': '4.3.0', 'lessThan': '4.3.0.108', 'versionType': 'custom'}, {'status': 'affected', 'version': '4.4.0', 'lessThan': '4.4.0.72', 'versionType': 'custom'}, {'status': 'affected', 'version': '4.5.0', 'lessThan': '4.5.0.57', 'versionType': 'custom'}, {'status': 'affected', 'version': '4.6.0', 'lessThan': '4.6.0.21', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}, {'vendor': 'WSO2', 'product': 'WSO2 Carbon API Manager Rest API Utility', 'versions': [{'status': 'affected', 'version': '9.20.74', 'lessThan': '9.20.74.401', 'versionType': 'custom'}, {'status': 'affected', 'version': '9.28.116', 'lessThan': '9.28.116.417', 'versionType': 'custom'}, {'status': 'affected', 'version': '9.29.120', 'lessThan': '9.29.120.236', 'versionType': 'custom'}, {'status': 'affected', 'version': '9.30.67', 'lessThan': '9.30.67.167', 'versionType': 'custom'}, {'status': 'affected', 'version': '9.31.86', 'lessThan': '9.31.86.158', 'versionType': 'custom'}, {'status': 'affected', 'version': '9.32.147', 'lessThan': '9.32.147.59', 'versionType': 'custom'}, {'status': 'unaffected', 'version': '9.33.106', 'versionType': 'custom', 'lessThanOrEqual': '*'}], 'packageName': 'org.wso2.carbon.apimgt:org.wso2.carbon.apimgt.rest.api.util', 'defaultStatus': 'unknown'}] Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Added CWE CWE-347 Added Reference https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5328/