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CVE-2026-26861

nvd nist
Published: Feb 27, 2026Modified: Jun 17, 2026

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8.3
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L
Exploitability: 2.8 / Impact: 5.5
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

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 (1)

Clevertap
1 product
Clevertap Web Sdk
Configuration A
1 vulnerable
Vulnerable SoftwareAffected Versions
Clevertap Web Sdk
Up to 1.15.2

Related CWEs

CWE-346
Origin Validation Error
The product does not properly verify that the source of data or communication is valid.

References (3)

Source: cve@mitre.org
Product
Source: cve@mitre.org
ExploitIssue TrackingVendor Advisory
Source: cve@mitre.org
Patch

Timeline

No history available yet.