CVE-2026-26862HIGH 8.3EPSS p28.3%

CVE-2026-26862CVE-2026-26862

Description

CleverTap Web SDK version 1.15.2 and earlier is vulnerable to DOM-based Cross-Site Scripting (XSS) via window.postMessage in the Visual Builder module. The origin validation in src/modules/visualBuilder/pageBuilder.js (lines 56-60) uses the includes() method to verify the originUrl contains "dashboard.clevertap.com", which can be bypassed by an attacker using a crafted subdomain

Scoring

CVSS 3.18.3 (HIGH)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L
EPSS0.37% probability of exploitation · percentile 28.3% · 2026-06-19T12:03:05Z
Published2026-02-27
Last modified2026-03-03

Underlying weaknesses· 2

CWE-79CWE-829

References

  1. https://github.com/CleverTap/clevertap-web-sdk/blob/cf1b65d/src/modules/visualBuilder/pageBuilder.js#L56-L60
  2. https://github.com/CleverTap/clevertap-web-sdk/issues/442
  3. https://github.com/CleverTap/clevertap-web-sdk/pull/417

2

TypeTargetConfidenceTier
WeaknessImproper Neutralization of Input During Web Page Generation ('Cross-site Scripting')cwe-790%live
WeaknessInclusion of Functionality from Untrusted Control Spherecwe-8290%live

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.