{"id":"CVE-2026-5430","published":"2026-08-06T08:16:33Z","modified":"2026-09-25T12:53:05Z","title":"WSO2 Multiple Products Path Traversal Vulnerability","vendor":"WSO2","product":"Multiple Products","tier":"core","eol":null,"description":{"text":"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.","provenance":"source","from":"NVD"},"summary":{"text":"The JWT authentication mechanism in WSO2's multiple products accepts tokens signed with algorithms other than those explicitly configured or supported, causing such tokens to be incorrectly validated. An attacker with network access and no authentication or user interaction can craft a JWT using an unsupported algorithm to gain unauthorized access, potentially including administrative accounts.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:14:55Z"},"cvss":{"score":10.0,"severity":"CRITICAL","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.2239,"percentile":0.97691,"date":"2026-10-30","provenance":"source"},"kev":{"dateAdded":"2026-09-24","dueDate":"2026-09-27","ransomware":false,"requiredAction":"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.","notes":"https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5328/ ; ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-5430","provenance":"source"},"vulncheckKev":{"dateAdded":"2026-09-15","exploitedFirstSeen":"2026-09-15","ransomware":false,"evidence":[{"url":"https://x.com/inkmoro/status/2099925214339727646","date":"2026-09-15"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2026-09-24"},{"url":"https://asec.ahnlab.com/en/95741/","date":"2026-10-07"}],"evidenceTotal":3,"provenance":"source"},"exploited":true,"otx":{"pulseCount":26,"pulses":[{"name":"Actively_Exploited_Kev | Oct 31, 2026","url":"https://otx.alienvault.com/pulse/6ae4aefab0c2191cecd41862","created":"2026-10-30"},{"name":"Actively_Exploited_Kev | Oct 30, 2026","url":"https://otx.alienvault.com/pulse/6ae35d889ea92b4ce19c2680","created":"2026-10-29"},{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"}],"provenance":"machine"},"cwes":[{"id":"CWE-347","name":"Improper Verification of Cryptographic Signature"}],"references":[{"url":"https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5328/","tags":["Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-5430","tags":["US Government Resource"]}],"techniques":[{"id":"T1190","name":"Exploit Public-Facing Application","tactics":["initial-access"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Remote unauthenticated exploit against public-facing authentication endpoint","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"The JWT authentication mechanism accepts tokens signed with algorithms other than those explicitly configured","start":0,"end":109}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1078","name":"Valid Accounts","tactics":["initial-access","persistence","privilege-escalation","stealth"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Forged token grants unauthorized valid-account access","mappingType":"primary_impact","evidence":[{"from":"description","quote":"leading to unauthorized access","start":231,"end":261}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1550","name":"Use Alternate Authentication Material","tactics":["lateral-movement"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Forged JWT reused as authentication material","mappingType":"primary_impact","evidence":[{"from":"description","quote":"potential compromise of administrative accounts and full account takeover","start":373,"end":446}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2026-53822","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-53822","exploited":true,"exploitedSince":"2026-09-24","provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":4,"skipped":0,"earliest":"2026-09-16","earliestUrl":"https://github.com/HORKimhab/CVE-2026-5430","repos":[{"name":"abraxas/CVE-2026-5430","url":"https://github.com/abraxas/CVE-2026-5430","stars":2,"created":"2026-09-25"},{"name":"davidvrns/CVE-2026-5430-WSO2","url":"https://github.com/davidvrns/CVE-2026-5430-WSO2","stars":1,"created":"2026-10-08"},{"name":"HORKimhab/CVE-2026-5430","url":"https://github.com/HORKimhab/CVE-2026-5430","stars":0,"created":"2026-09-16"},{"name":"getdrive/wso2_cve-2026-5430_lab","url":"https://github.com/getdrive/wso2_cve-2026-5430_lab","stars":0,"created":"2026-10-08"}]},"first":{"date":"2026-09-16","source":"PoC-in-GitHub","url":"https://github.com/HORKimhab/CVE-2026-5430"},"provenance":"source"},"exploitRefs":[],"flow":[{"stage":"exploitation","techniques":["T1190"],"provenance":"ai"},{"stage":"primary","techniques":["T1078","T1550"],"provenance":"ai"}],"timeline":[{"date":"2026-08-06","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-5430","provenance":"source"},{"date":"2026-09-15","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://x.com/inkmoro/status/2099925214339727646","provenance":"source"},{"date":"2026-09-16","kind":"exploit-public","label":"First public exploit: PoC-in-GitHub","url":"https://github.com/HORKimhab/CVE-2026-5430","provenance":"source"},{"date":"2026-09-24","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2026-09-24","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-53822","provenance":"source"}],"speed":{"daysToPublicExploit":41,"firstExploitFrom":"PoC-in-GitHub","daysToKev":49},"priority":{"score":79.5,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":10.0,"detail":"added 46 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.54,"detail":"percentile 0.9769"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"4 PoC-in-GitHub repos"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"26 pulses"},{"name":"CVSS severity","points":7.0,"detail":"base score 10.0"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}