{"cve":"CVE-2026-26862","nvd":{"published":"2026-02-27T18:16:12.163","modified":"2026-06-17T10:26:22.113","status":"Analyzed","description":"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","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L","score":8.3},"cwes":["CWE-79","CWE-829"],"references":["https://github.com/CleverTap/clevertap-web-sdk/blob/cf1b65d/src/modules/visualBuilder/pageBuilder.js#L56-L60","https://github.com/CleverTap/clevertap-web-sdk/issues/442","https://github.com/CleverTap/clevertap-web-sdk/pull/417"],"products":["clevertap:clevertap_web_sdk"],"source":"nvd","synced_at":"2026-10-19T22:24:17.937441719+00:00"},"epss":{"cve":"CVE-2026-26862","score":0.00422,"percentile":0.36593,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-jfrq-hj9f-c8qx","url":"https://osv.dev/vulnerability/GHSA-jfrq-hj9f-c8qx","summary":"CleverTap Web SDK is vulnerable to DOM-based Cross-Site Scripting (XSS) via window.postMessage","modified":"2026-03-04T15:12:09.545600Z","packages":[{"ecosystem":"npm","name":"clevertap-web-sdk","purl":"pkg:npm/clevertap-web-sdk","ranges":["<1.15.3"],"fixed":["1.15.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}