CVE-2026-26862Public exploitNetwork attack vector

DOM XSS via substring-based postMessage origin validation

Published Feb 27, 2026 · Updated Feb 27, 2026

DOM-based XSS in CleverTap Web SDK 1.15.2 and earlier allows remote attackers to execute JavaScript through a crafted postMessage. Visual Builder's pageBuilder.js accepts an event origin when includes() finds dashboard.clevertap.com anywhere in it, then writes unsanitized selector HTML to element.outerHTML. Exploitation requires a site using the vulnerable SDK and user interaction with an attacker-controlled origin; successful code runs in the site's browser context.

CVSS severity8.3
High
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DOM-based XSS in CleverTap Web SDK 1.15.2 and earlier allows remote attackers to execute JavaScript through a crafted postMessage. Visual Builder's pageBuilder.js accepts an event origin when includes() finds dashboard.clevertap.com anywhere in it, then writes unsanitized selector HTML to element.outerHTML. Exploitation requires a site using the vulnerable SDK and user interaction with an attacker-controlled origin; successful code runs in the site's browser context.

The record

CVE
CVE-2026-26862
Published
Feb 27, 2026
Updated
Feb 27, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-829, CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-829Inclusion of Functionality from Untrusted Control Sphere
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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