{"id":"CVE-2026-5430","state":"PUBLISHED","title":"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.\n\nSuccessful 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.","publishedAt":"2026-08-06T07:33:28.156Z","updatedAt":"2026-09-25T03:55:16.285Z","severity":{"score":10,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","source":"WSO2"},"assigner":"WSO2","products":["WSO2 WSO2 Universal Gateway","WSO2 WSO2 Traffic Manager","WSO2 WSO2 API Control Plane","WSO2 WSO2 API Manager","WSO2 WSO2 Carbon API Manager Rest API Utility"],"affected":[{"vendor":"WSO2","product":"WSO2 Universal Gateway","defaultStatus":"unaffected","versions":[{"version":"4.5.0","status":"affected","lessThan":"4.5.0.57","versionType":"custom"},{"version":"4.6.0","status":"affected","lessThan":"4.6.0.21","versionType":"custom"}]},{"vendor":"WSO2","product":"WSO2 Traffic Manager","defaultStatus":"unaffected","versions":[{"version":"4.5.0","status":"affected","lessThan":"4.5.0.56","versionType":"custom"},{"version":"4.6.0","status":"affected","lessThan":"4.6.0.21","versionType":"custom"}]},{"vendor":"WSO2","product":"WSO2 API Control Plane","defaultStatus":"unaffected","versions":[{"version":"4.5.0","status":"affected","lessThan":"4.5.0.58","versionType":"custom"},{"version":"4.6.0","status":"affected","lessThan":"4.6.0.22","versionType":"custom"}]},{"vendor":"WSO2","product":"WSO2 API Manager","defaultStatus":"unaffected","versions":[{"version":"0","status":"unknown","lessThan":"4.1.0","versionType":"custom"},{"version":"4.1.0","status":"affected","lessThan":"4.1.0.257","versionType":"custom"},{"version":"4.2.0","status":"affected","lessThan":"4.2.0.197","versionType":"custom"},{"version":"4.3.0","status":"affected","lessThan":"4.3.0.108","versionType":"custom"},{"version":"4.4.0","status":"affected","lessThan":"4.4.0.72","versionType":"custom"},{"version":"4.5.0","status":"affected","lessThan":"4.5.0.57","versionType":"custom"},{"version":"4.6.0","status":"affected","lessThan":"4.6.0.21","versionType":"custom"}]},{"vendor":"WSO2","product":"WSO2 Carbon API Manager Rest API Utility","packageName":"org.wso2.carbon.apimgt:org.wso2.carbon.apimgt.rest.api.util","defaultStatus":"unknown","versions":[{"version":"9.20.74","status":"affected","lessThan":"9.20.74.401","versionType":"custom"},{"version":"9.28.116","status":"affected","lessThan":"9.28.116.417","versionType":"custom"},{"version":"9.29.120","status":"affected","lessThan":"9.29.120.236","versionType":"custom"},{"version":"9.30.67","status":"affected","lessThan":"9.30.67.167","versionType":"custom"},{"version":"9.31.86","status":"affected","lessThan":"9.31.86.158","versionType":"custom"},{"version":"9.32.147","status":"affected","lessThan":"9.32.147.59","versionType":"custom"},{"version":"9.33.106","status":"unaffected","lessThanOrEqual":"*","versionType":"custom"}]}],"references":["https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5328/","https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-5430"],"weaknesses":["CWE-347"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/5xxx/CVE-2026-5430.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-5430","state":"PUBLISHED","datePublished":"2026-08-06T07:33:28.156Z","dateUpdated":"2026-09-25T03:55:16.285Z","assignerShortName":"WSO2","assignerOrgId":"ed10eef1-636d-4fbe-9993-6890dfa878f8","dateReserved":"2026-04-02T16:11:32.536Z"},"containers":{"cna":{"title":"Authentication Bypass via JWT Algorithm Mismatch in Multiple WSO2 Products Allows Account Takeover","descriptions":[{"lang":"en","value":"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.\n\nSuccessful 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."}],"affected":[{"vendor":"WSO2","product":"WSO2 Universal Gateway","defaultStatus":"unaffected","versions":[{"version":"4.5.0","status":"affected","lessThan":"4.5.0.57","versionType":"custom"},{"version":"4.6.0","status":"affected","lessThan":"4.6.0.21","versionType":"custom"}]},{"vendor":"WSO2","product":"WSO2 Traffic Manager","defaultStatus":"unaffected","versions":[{"version":"4.5.0","status":"affected","lessThan":"4.5.0.56","versionType":"custom"},{"version":"4.6.0","status":"affected","lessThan":"4.6.0.21","versionType":"custom"}]},{"vendor":"WSO2","product":"WSO2 API Control 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transparent;\">https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5328/#solution</span></a> <br>"}]}],"credits":[{"lang":"en","value":"hacktron.ai","type":"finder"}],"source":{"advisory":"WSO2-2026-5328","discovery":"EXTERNAL"},"x_generator":{"engine":"Vulnogram 0.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-5430","tags":["government-resource"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-24T00:00:00+00:00","options":[{"Exploitation":"active"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA 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