clevertap-web-sdk (npm) — known CVEs & security advisories

Known CVE vulnerabilities and GitHub Security Advisories affecting the npm package clevertap-web-sdk, with affected version ranges, CVSS severity, EPSS exploit prediction, and CISA KEV status.

CVEs (2)

• CVE-2026-26861 — CVSS 8.3 (high): CleverTap Web SDK version 1.15.2 and earlier is vulnerable to Cross-Site Scripting (XSS) via window.postMessage. The handleCustomHtmlPreview…
• CVE-2026-26862 — CVSS 8.3 (high): CleverTap Web SDK version 1.15.2 and earlier is vulnerable to DOM-based Cross-Site Scripting (XSS) via window.postMessage in the Visual…