cve.bz

CVE-2026-26862

8.3 highEPSS 0.4%

High (8.3) in clevertap clevertap web sdk. EPSS 0.4% chance of exploitation in the next 30 days. Fixed in clevertap-web-sdk 1.15.3.

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

Severity

CVSS 3.1

8.3 high
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L
EPSS
0.4% chance of exploitation in the next 30 days; higher than 36% of CVEs (scores of 2026-10-31)
CWEs
CWE-79, CWE-829
Published
Modified
Record from
the NVD, synced

Affected

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-jfrq-hj9f-c8qxnpmclevertap-web-sdk<1.15.31.15.3

References

Check your stackJSON