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Vulnerability Details :

CVE-2026-26861

Summary
Assigner-mitre
Assigner Org ID-8254265b-2729-46b6-b9e3-3dfca2d5bfca
Published At-27 Feb, 2026 | 00:00
Updated At-27 Feb, 2026 | 19:42
Rejected At-
Credits

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

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:mitre
Assigner Org ID:8254265b-2729-46b6-b9e3-3dfca2d5bfca
Published At:27 Feb, 2026 | 00:00
Updated At:27 Feb, 2026 | 19:42
Rejected At:
▼CVE Numbering Authority (CNA)

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
Vendor
n/a
Product
n/a
Versions
Affected
  • n/a
Problem Types
TypeCWE IDDescription
textN/An/a
Type: text
CWE ID: N/A
Description: n/a
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/CleverTap/clevertap-web-sdk/issues/424
N/A
https://github.com/CleverTap/clevertap-web-sdk/pull/417
N/A
https://github.com/CleverTap/clevertap-web-sdk/blob/cf1b65d/src/util/campaignRender/nativeDisplay.js#L118-L121
N/A
Hyperlink: https://github.com/CleverTap/clevertap-web-sdk/issues/424
Resource: N/A
Hyperlink: https://github.com/CleverTap/clevertap-web-sdk/pull/417
Resource: N/A
Hyperlink: https://github.com/CleverTap/clevertap-web-sdk/blob/cf1b65d/src/util/campaignRender/nativeDisplay.js#L118-L121
Resource: N/A
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Problem Types
TypeCWE IDDescription
CWECWE-346CWE-346 Origin Validation Error
Type: CWE
CWE ID: CWE-346
Description: CWE-346 Origin Validation Error
Metrics
VersionBase scoreBase severityVector
3.18.3HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L
Version: 3.1
Base score: 8.3
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:cve@mitre.org
Published At:27 Feb, 2026 | 18:16
Updated At:03 Mar, 2026 | 18:46

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

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.18.3HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L
Type: Secondary
Version: 3.1
Base score: 8.3
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L
CPE Matches
clevertap
clevertap
>>clevertap_web_sdk>>Versions up to 1.15.2(inclusive)
cpe:2.3:a:clevertap:clevertap_web_sdk:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-346Secondary134c704f-9b21-4f2e-91b3-4a467353bcc0
CWE ID: CWE-346
Type: Secondary
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/CleverTap/clevertap-web-sdk/blob/cf1b65d/src/util/campaignRender/nativeDisplay.js#L118-L121cve@mitre.org
Product
https://github.com/CleverTap/clevertap-web-sdk/issues/424cve@mitre.org
Exploit
Issue Tracking
Vendor Advisory
https://github.com/CleverTap/clevertap-web-sdk/pull/417cve@mitre.org
Patch
Hyperlink: https://github.com/CleverTap/clevertap-web-sdk/blob/cf1b65d/src/util/campaignRender/nativeDisplay.js#L118-L121
Source: cve@mitre.org
Resource:
Product
Hyperlink: https://github.com/CleverTap/clevertap-web-sdk/issues/424
Source: cve@mitre.org
Resource:
Exploit
Issue Tracking
Vendor Advisory
Hyperlink: https://github.com/CleverTap/clevertap-web-sdk/pull/417
Source: cve@mitre.org
Resource:
Patch

Change History

0
Information is not available yet

Similar CVEs

1Records found
CVE-2026-26862
Matching Score-8
Assigner-MITRE Corporation
ShareView Details
Matching Score-8
Assigner-MITRE Corporation
CVSS Score-8.3||HIGH
EPSS-0.01% / 1.83%
||
7 Day CHG~0.00%
Published-27 Feb, 2026 | 00:00
Updated-03 Mar, 2026 | 18:44
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

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

Action-Not Available
Vendor-clevertapn/a
Product-clevertap_web_sdkn/a
CWE ID-CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE ID-CWE-829
Inclusion of Functionality from Untrusted Control Sphere
Details not found