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Vulnerability DatabaseCVE-2026-26861

CVE-2026-26861: 
JavaScript vulnerability analysis and mitigation

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

Source: NVD

Related JavaScript vulnerabilities:

CVE ID

Severity

Score

Technologies

Component name

CISA KEV exploit

Has fix

Published date

GHSA-3hfp-gqgh-xc5gCRITICAL9.6
  • JavaScriptJavaScript
  • @lightdash/cli
NoYesApr 02, 2026
CVE-2026-34950CRITICAL9.1
  • JavaScriptJavaScript
  • fast-jwt
NoNoApr 02, 2026
CVE-2026-34752HIGH8.7
  • JavaScriptJavaScript
  • haraka
NoYesApr 02, 2026
CVE-2026-34825HIGH8.5
  • JavaScriptJavaScript
  • @nocobase/plugin-workflow-sql
NoYesApr 02, 2026
GHSA-ccgf-5rwj-j3hvLOW2.1
  • JavaScriptJavaScript
  • telejson
NoYesApr 02, 2026

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