High severityNVD Advisory· Published Feb 27, 2026· Updated Feb 27, 2026
CVE-2026-26861
CVE-2026-26861
Description
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
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
clevertap-web-sdknpm | < 1.15.3 | 1.15.3 |
Affected products
2Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-j5mf-6rh3-rhggghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-26861ghsaADVISORY
- github.com/CleverTap/clevertap-web-sdk/blob/cf1b65d/src/util/campaignRender/nativeDisplay.jsghsaWEB
- github.com/CleverTap/clevertap-web-sdk/commit/84695b726a751614ddc3a4f71382c239c5833e03ghsaWEB
- github.com/CleverTap/clevertap-web-sdk/issues/424ghsaWEB
- github.com/CleverTap/clevertap-web-sdk/pull/417ghsaWEB
News mentions
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