CVEDB API

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-26861

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

Exploit prediction scoring system (EPSS) score

EPSS Score 0.0

EPSS Ranking 6.8%

CVSS Severity

CVSS v3 Score 8.3

References

Products affected by CVE-2026-26861

Clevertap » Clevertap Web Sdk » Version: 1.0.0

cpe:2.3:a:clevertap:clevertap_web_sdk:1.0.0
Clevertap » Clevertap Web Sdk » Version: 1.1.0

cpe:2.3:a:clevertap:clevertap_web_sdk:1.1.0
Clevertap » Clevertap Web Sdk » Version: 1.1.1

cpe:2.3:a:clevertap:clevertap_web_sdk:1.1.1
Clevertap » Clevertap Web Sdk » Version: 1.1.2

cpe:2.3:a:clevertap:clevertap_web_sdk:1.1.2
Clevertap » Clevertap Web Sdk » Version: 1.1.3

cpe:2.3:a:clevertap:clevertap_web_sdk:1.1.3
Clevertap » Clevertap Web Sdk » Version: 1.10.0

cpe:2.3:a:clevertap:clevertap_web_sdk:1.10.0
Clevertap » Clevertap Web Sdk » Version: 1.10.1

cpe:2.3:a:clevertap:clevertap_web_sdk:1.10.1
Clevertap » Clevertap Web Sdk » Version: 1.11.0

cpe:2.3:a:clevertap:clevertap_web_sdk:1.11.0
Clevertap » Clevertap Web Sdk » Version: 1.11.1

cpe:2.3:a:clevertap:clevertap_web_sdk:1.11.1
Clevertap » Clevertap Web Sdk » Version: 1.11.10

cpe:2.3:a:clevertap:clevertap_web_sdk:1.11.10
Clevertap » Clevertap Web Sdk » Version: 1.11.11

cpe:2.3:a:clevertap:clevertap_web_sdk:1.11.11
Clevertap » Clevertap Web Sdk » Version: 1.11.12

cpe:2.3:a:clevertap:clevertap_web_sdk:1.11.12
Clevertap » Clevertap Web Sdk » Version: 1.11.13

cpe:2.3:a:clevertap:clevertap_web_sdk:1.11.13
Clevertap » Clevertap Web Sdk » Version: 1.11.14

cpe:2.3:a:clevertap:clevertap_web_sdk:1.11.14
Clevertap » Clevertap Web Sdk » Version: 1.11.15

cpe:2.3:a:clevertap:clevertap_web_sdk:1.11.15
Clevertap » Clevertap Web Sdk » Version: 1.11.16

cpe:2.3:a:clevertap:clevertap_web_sdk:1.11.16
Clevertap » Clevertap Web Sdk » Version: 1.11.2

cpe:2.3:a:clevertap:clevertap_web_sdk:1.11.2
Clevertap » Clevertap Web Sdk » Version: 1.11.3

cpe:2.3:a:clevertap:clevertap_web_sdk:1.11.3
Clevertap » Clevertap Web Sdk » Version: 1.11.4

cpe:2.3:a:clevertap:clevertap_web_sdk:1.11.4
Clevertap » Clevertap Web Sdk » Version: 1.11.5

cpe:2.3:a:clevertap:clevertap_web_sdk:1.11.5
Clevertap » Clevertap Web Sdk » Version: 1.11.6

cpe:2.3:a:clevertap:clevertap_web_sdk:1.11.6
Clevertap » Clevertap Web Sdk » Version: 1.11.7

cpe:2.3:a:clevertap:clevertap_web_sdk:1.11.7
Clevertap » Clevertap Web Sdk » Version: 1.11.8

cpe:2.3:a:clevertap:clevertap_web_sdk:1.11.8
Clevertap » Clevertap Web Sdk » Version: 1.11.9

cpe:2.3:a:clevertap:clevertap_web_sdk:1.11.9
Clevertap » Clevertap Web Sdk » Version: 1.12.0

cpe:2.3:a:clevertap:clevertap_web_sdk:1.12.0
Clevertap » Clevertap Web Sdk » Version: 1.12.1

cpe:2.3:a:clevertap:clevertap_web_sdk:1.12.1
Clevertap » Clevertap Web Sdk » Version: 1.13.0

cpe:2.3:a:clevertap:clevertap_web_sdk:1.13.0
Clevertap » Clevertap Web Sdk » Version: 1.13.1

cpe:2.3:a:clevertap:clevertap_web_sdk:1.13.1
Clevertap » Clevertap Web Sdk » Version: 1.13.2

cpe:2.3:a:clevertap:clevertap_web_sdk:1.13.2
Clevertap » Clevertap Web Sdk » Version: 1.13.3

cpe:2.3:a:clevertap:clevertap_web_sdk:1.13.3
Clevertap » Clevertap Web Sdk » Version: 1.13.4

cpe:2.3:a:clevertap:clevertap_web_sdk:1.13.4
Clevertap » Clevertap Web Sdk » Version: 1.13.5

cpe:2.3:a:clevertap:clevertap_web_sdk:1.13.5
Clevertap » Clevertap Web Sdk » Version: 1.13.6

cpe:2.3:a:clevertap:clevertap_web_sdk:1.13.6
Clevertap » Clevertap Web Sdk » Version: 1.13.7

cpe:2.3:a:clevertap:clevertap_web_sdk:1.13.7
Clevertap » Clevertap Web Sdk » Version: 1.14.0

cpe:2.3:a:clevertap:clevertap_web_sdk:1.14.0
Clevertap » Clevertap Web Sdk » Version: 1.14.1

cpe:2.3:a:clevertap:clevertap_web_sdk:1.14.1
Clevertap » Clevertap Web Sdk » Version: 1.14.2

cpe:2.3:a:clevertap:clevertap_web_sdk:1.14.2
Clevertap » Clevertap Web Sdk » Version: 1.14.3

cpe:2.3:a:clevertap:clevertap_web_sdk:1.14.3
Clevertap » Clevertap Web Sdk » Version: 1.14.4

cpe:2.3:a:clevertap:clevertap_web_sdk:1.14.4
Clevertap » Clevertap Web Sdk » Version: 1.15.0

cpe:2.3:a:clevertap:clevertap_web_sdk:1.15.0
Clevertap » Clevertap Web Sdk » Version: 1.15.1

cpe:2.3:a:clevertap:clevertap_web_sdk:1.15.1
Clevertap » Clevertap Web Sdk » Version: 1.15.2

cpe:2.3:a:clevertap:clevertap_web_sdk:1.15.2
Clevertap » Clevertap Web Sdk » Version: 1.2.0

cpe:2.3:a:clevertap:clevertap_web_sdk:1.2.0
Clevertap » Clevertap Web Sdk » Version: 1.2.1

cpe:2.3:a:clevertap:clevertap_web_sdk:1.2.1
Clevertap » Clevertap Web Sdk » Version: 1.3.0

cpe:2.3:a:clevertap:clevertap_web_sdk:1.3.0
Clevertap » Clevertap Web Sdk » Version: 1.3.1

cpe:2.3:a:clevertap:clevertap_web_sdk:1.3.1
Clevertap » Clevertap Web Sdk » Version: 1.3.2

cpe:2.3:a:clevertap:clevertap_web_sdk:1.3.2
Clevertap » Clevertap Web Sdk » Version: 1.3.3

cpe:2.3:a:clevertap:clevertap_web_sdk:1.3.3
Clevertap » Clevertap Web Sdk » Version: 1.3.4

cpe:2.3:a:clevertap:clevertap_web_sdk:1.3.4
Clevertap » Clevertap Web Sdk » Version: 1.3.5

cpe:2.3:a:clevertap:clevertap_web_sdk:1.3.5
Clevertap » Clevertap Web Sdk » Version: 1.4.0

cpe:2.3:a:clevertap:clevertap_web_sdk:1.4.0
Clevertap » Clevertap Web Sdk » Version: 1.4.1

cpe:2.3:a:clevertap:clevertap_web_sdk:1.4.1
Clevertap » Clevertap Web Sdk » Version: 1.4.2

cpe:2.3:a:clevertap:clevertap_web_sdk:1.4.2
Clevertap » Clevertap Web Sdk » Version: 1.5.0

cpe:2.3:a:clevertap:clevertap_web_sdk:1.5.0
Clevertap » Clevertap Web Sdk » Version: 1.5.1

cpe:2.3:a:clevertap:clevertap_web_sdk:1.5.1
Clevertap » Clevertap Web Sdk » Version: 1.5.2

cpe:2.3:a:clevertap:clevertap_web_sdk:1.5.2
Clevertap » Clevertap Web Sdk » Version: 1.6.0

cpe:2.3:a:clevertap:clevertap_web_sdk:1.6.0
Clevertap » Clevertap Web Sdk » Version: 1.6.1

cpe:2.3:a:clevertap:clevertap_web_sdk:1.6.1
Clevertap » Clevertap Web Sdk » Version: 1.6.10

cpe:2.3:a:clevertap:clevertap_web_sdk:1.6.10
Clevertap » Clevertap Web Sdk » Version: 1.6.2

cpe:2.3:a:clevertap:clevertap_web_sdk:1.6.2
Clevertap » Clevertap Web Sdk » Version: 1.6.3

cpe:2.3:a:clevertap:clevertap_web_sdk:1.6.3
Clevertap » Clevertap Web Sdk » Version: 1.6.4

cpe:2.3:a:clevertap:clevertap_web_sdk:1.6.4
Clevertap » Clevertap Web Sdk » Version: 1.6.5

cpe:2.3:a:clevertap:clevertap_web_sdk:1.6.5
Clevertap » Clevertap Web Sdk » Version: 1.6.6

cpe:2.3:a:clevertap:clevertap_web_sdk:1.6.6
Clevertap » Clevertap Web Sdk » Version: 1.6.7

cpe:2.3:a:clevertap:clevertap_web_sdk:1.6.7
Clevertap » Clevertap Web Sdk » Version: 1.6.8

cpe:2.3:a:clevertap:clevertap_web_sdk:1.6.8
Clevertap » Clevertap Web Sdk » Version: 1.6.9

cpe:2.3:a:clevertap:clevertap_web_sdk:1.6.9
Clevertap » Clevertap Web Sdk » Version: 1.7.0

cpe:2.3:a:clevertap:clevertap_web_sdk:1.7.0
Clevertap » Clevertap Web Sdk » Version: 1.7.1

cpe:2.3:a:clevertap:clevertap_web_sdk:1.7.1
Clevertap » Clevertap Web Sdk » Version: 1.7.2

cpe:2.3:a:clevertap:clevertap_web_sdk:1.7.2
Clevertap » Clevertap Web Sdk » Version: 1.7.3

cpe:2.3:a:clevertap:clevertap_web_sdk:1.7.3
Clevertap » Clevertap Web Sdk » Version: 1.7.4

cpe:2.3:a:clevertap:clevertap_web_sdk:1.7.4
Clevertap » Clevertap Web Sdk » Version: 1.7.5

cpe:2.3:a:clevertap:clevertap_web_sdk:1.7.5
Clevertap » Clevertap Web Sdk » Version: 1.7.6

cpe:2.3:a:clevertap:clevertap_web_sdk:1.7.6
Clevertap » Clevertap Web Sdk » Version: 1.8.0

cpe:2.3:a:clevertap:clevertap_web_sdk:1.8.0
Clevertap » Clevertap Web Sdk » Version: 1.8.1

cpe:2.3:a:clevertap:clevertap_web_sdk:1.8.1
Clevertap » Clevertap Web Sdk » Version: 1.8.2

cpe:2.3:a:clevertap:clevertap_web_sdk:1.8.2
Clevertap » Clevertap Web Sdk » Version: 1.8.3

cpe:2.3:a:clevertap:clevertap_web_sdk:1.8.3
Clevertap » Clevertap Web Sdk » Version: 1.9.0

cpe:2.3:a:clevertap:clevertap_web_sdk:1.9.0
Clevertap » Clevertap Web Sdk » Version: 1.9.1

cpe:2.3:a:clevertap:clevertap_web_sdk:1.9.1
Clevertap » Clevertap Web Sdk » Version: 1.9.2

cpe:2.3:a:clevertap:clevertap_web_sdk:1.9.2
Clevertap » Clevertap Web Sdk » Version: 1.9.3

cpe:2.3:a:clevertap:clevertap_web_sdk:1.9.3
Clevertap » Clevertap Web Sdk » Version: 1.9.4

cpe:2.3:a:clevertap:clevertap_web_sdk:1.9.4
Clevertap » Clevertap Web Sdk » Version: 1.9.5

cpe:2.3:a:clevertap:clevertap_web_sdk:1.9.5
Clevertap » Clevertap Web Sdk » Version: 1.9.6

cpe:2.3:a:clevertap:clevertap_web_sdk:1.9.6

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-26861

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