What is CVE-2026-26862?

CVE-2026-26862 is a high-severity vulnerability in Clevertap Web Sdk, classified under Cross-site Scripting. CVSS score: 8.3/10. Published 2026-02-27.

How severe is CVE-2026-26862?

High severity. CVSS v3 base score is 8.3 out of 10.

XSS in Clevertap Web Sdk

CVE-2026-26862

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

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.004 (29.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L.

Affected products

Clevertap Clevertap_web_sdk
N/a — versions n/a

Weakness classification (CWE)

References

cve@mitre.org (Exploit, Issue Tracking, Vendor Advisory)
cve@mitre.org (Patch)
cve@mitre.org (Product)

Frequently asked questions

What is CVE-2026-26862?: CVE-2026-26862 is a high-severity vulnerability in Clevertap Web Sdk, classified under Cross-site Scripting. CVSS score: 8.3/10. Published 2026-02-27.
How severe is CVE-2026-26862?: High severity. CVSS v3 base score is 8.3 out of 10.