cve.bz

CVE-2026-26861

8.3 highEPSS 0.2%

High (8.3) in clevertap clevertap web sdk. EPSS 0.2% 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 Cross-Site Scripting (XSS) via window.postMessage. The handleCustomHtmlPreviewPostMessageEvent function in src/util/campaignRender/nativeDisplay.js performs insufficient origin validation using the includes() method, which can be bypassed by an attacker using a 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
0.2% chance of exploitation in the next 30 days; higher than 10% of CVEs (scores of 2026-10-31)
CWE
CWE-346
Published
Modified
Record from
the NVD, synced

Affected

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-j5mf-6rh3-rhggnpmclevertap-web-sdk<1.15.31.15.3

References

Check your stackJSON