> CVE-2026-26861

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PUBLISHED
2026-02-27 18:16
MODIFIED
2026-02-27 18:16
EPSS (Prob. Exploit)
0.23%
Top 86.9%
DATA SOURCES:
NVD 🔗 2026-02-27 FIRST EPSS 🔗 2026-10-25 GITHUB 🔗 2026-10-28

> 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

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> GITHUB SECURITY ADVISORY

GHSA-j5mf-6rh3-rhgg HIGH

CleverTap Web SDK is vulnerable to DOM-based XSS via handleCustomHtmlPreviewPostMessageEvent function

AFFECTED PACKAGES:
NPM / clevertap-web-sdk
< 1.15.3
Fixed in: 1.15.3

> HISTORIQUE DES MODIFICATIONS

Première apparition
27/02/2026 18:16
Source: NVD
Total des modifications: 0 Dernière mise à jour: 8 months ago

> REFERENCES

https://github.com/CleverTap/clevertap-web-sdk/blob/cf1b65d/src/util/campaignRen...
https://github.com/CleverTap/clevertap-web-sdk/issues/424
https://github.com/CleverTap/clevertap-web-sdk/pull/417
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