CVE-2026-26861

HIGH 8.3

CVSS Score

8.3

EPSS Score

0.0%

EPSS Percentile

0th

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

Vendor	n/a
Product	n/a
Published	Feb 27, 2026
Last Updated	Feb 27, 2026

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Affected Versions

n/a / n/a

n/a

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/CleverTap/clevertap-web-sdk/issues/424 github.com: https://github.com/CleverTap/clevertap-web-sdk/pull/417 github.com: https://github.com/CleverTap/clevertap-web-sdk/blob/cf1b65d/src/util/campaignRender/nativeDisplay.js#L118-L121