--- title: "CVE-2026-5430: Authentication Bypass via JWT Algorithm… | CubePath" description: "The JWT authentication mechanism accepts tokens signed with algorithms other than those explicitly configured or supported. This allows an attacker…" language: en source: https://cubepath.com/security/cve/CVE-2026-5430 --- # CVE-2026-5430: Authentication Bypass via JWT Algorithm… | CubePath ## 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. Official description from the CVE record, published by WSO2. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-5430) ## Key data ### CVSS 3.1 Critical 10.0 Score published by WSO2 in the CVE record. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H | Metric | Value | What it means | | ---------------------- | ------- | ----------------------------------------------------------------------------------- | | Attack vector | Network | The vulnerable component can be reached over a network, possibly from the Internet. | | Attack complexity | Low | No special conditions are needed. The attack can be repeated at will. | | Privileges required | None | No account or privileges are needed. | | User interaction | None | No action from any user is needed. | | Scope | Changed | The impact can reach other components beyond the vulnerable one. | | Confidentiality impact | High | Serious or total effect on the secrecy of data. | | Integrity impact | High | Serious or total effect on the trustworthiness of data. | | Availability impact | High | Serious or total effect on availability. | CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) . ### EPSS Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days. Score 0.22390 (22.4% probability) Percentile 97.7% Scores of Nov 10, 2026 Model v2026.06.15 ### CISA Known Exploited Vulnerabilities This CVE is listed in the CISA KEV catalog. Name in the catalog WSO2 Multiple Products Path Traversal Vulnerability Added to the catalog Sep 24, 2026 Federal due date Sep 27, 2026 ### CISA assessment as of Sep 24, 2026 Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA. Exploitation Recorded by CISA as active Automatable yes Technical impact total ### Weakness (CWE) CWE catalog version 5.0. CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license. - [CWE-347](https://cwe.mitre.org/data/definitions/347.html) Improper Verification of Cryptographic Signature ## Affected products Products listed in the CVE record, as the CNA published them. - WSO2 Universal Gateway - affected: 4.5.0 up to before 4.5.0.57 - affected: 4.6.0 up to before 4.6.0.21 - WSO2 Traffic Manager - affected: 4.5.0 up to before 4.5.0.56 - affected: 4.6.0 up to before 4.6.0.21 - WSO2 API Control Plane - affected: 4.5.0 up to before 4.5.0.58 - affected: 4.6.0 up to before 4.6.0.22 - WSO2 API Manager - unknown: before 4.1.0 - affected: 4.1.0 up to before 4.1.0.257 - affected: 4.2.0 up to before 4.2.0.197 - affected: 4.3.0 up to before 4.3.0.108 - affected: 4.4.0 up to before 4.4.0.72 - affected: 4.5.0 up to before 4.5.0.57 - affected: 4.6.0 up to before 4.6.0.21 - WSO2 Carbon API Manager Rest API Utility - affected: 9.20.74 up to before 9.20.74.401 - affected: 9.28.116 up to before 9.28.116.417 - affected: 9.29.120 up to before 9.29.120.236 - affected: 9.30.67 up to before 9.30.67.167 - affected: 9.31.86 up to before 9.31.86.158 - affected: 9.32.147 up to before 9.32.147.59 - unaffected: 9.33.106 up to \* ## References Links listed in the CVE record. They lead to other sites, which CubePath does not control. - [security.docs.wso2.com/en/latest/security-announcements/sec…](https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5328/) vendor-advisory ## Timeline 1. ID reserved Apr 2, 2026 2. Record published Aug 6, 2026 3. Added to CISA KEV Sep 24, 2026 4. Record last updated Sep 25, 2026 ## Look up another CVE ## About CubePath CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection. [Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection) Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:08 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)