{"id":"CVE-2026-26862","aliases":["GHSA-jfrq-hj9f-c8qx"],"url":"https://o3.security/vulnerability/CVE-2026-26862","summary":"CleverTap Web SDK is vulnerable to DOM-based Cross-Site Scripting (XSS) via window.postMessage","details":"CleverTap Web SDK version 1.15.2 and earlier is vulnerable to DOM-based Cross-Site Scripting (XSS) via window.postMessage in the Visual Builder module. The origin validation in src/modules/visualBuilder/pageBuilder.js (lines 56-60) uses the includes() method to verify the originUrl contains \"dashboard.clevertap.com\", which can be bypassed by an attacker using a crafted subdomain","published":"2026-02-27T00:00:00Z","modified":"2026-07-15T01:49:01.064779755Z","cvss":{"score":8.3,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"clevertap-web-sdk","fixedVersion":"1.15.3"}],"fix":{"url":"https://github.com/CleverTap/clevertap-web-sdk/pull/417","label":"CleverTap/clevertap-web-sdk#417"},"references":[{"type":"WEB","url":"https://github.com/CleverTap/clevertap-web-sdk/blob/cf1b65d/src/modules/visualBuilder/pageBuilder.js#L56-L60"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26862.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-26862"},{"type":"REPORT","url":"https://github.com/CleverTap/clevertap-web-sdk/issues/442"},{"type":"FIX","url":"https://github.com/CleverTap/clevertap-web-sdk/pull/417"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:49:01.064779755Z"}}