# clevertap-web-sdk (npm) vulnerabilities

2 known vulnerabilities (2 high), with the versions each affects and the releases that fix them.

## At a glance

- Latest release: 3.1.2 (Nov 2, 2026): no advisory affects it
- Newest unaffected release: 3.1.2 (Nov 2, 2026), the latest release
- Weekly downloads: 41.9K
- Dependents: 0
- Releases: 134 since 1.0.0 (Apr 22, 2021)
- Registry: https://www.npmjs.com/package/clevertap-web-sdk
- Releases read: Nov 8, 2026

## Version timeline

Affected versions per advisory, in version order:

- CVE-2026-26862: 1.0.0-beta.1 to 1.15.2 (1.15.3 is outside it)
- CVE-2026-26861: 1.0.0-beta.1 to 1.15.2 (1.15.3 is outside it)

## Advisories (2)

### [CVE-2026-26862](https://cve.now/CVE-2026-26862): CleverTap Web SDK version 1.15.2 and earlier is vulnerable to DOM-based Cross-Site Scripting (XSS) via window.postMessage in the Visual…

- Severity: High 8.3
- Published: Feb 27, 2026
- Affected: fixed in 1.15.3.
- Fixed in 1.15.3 (released May 28, 2025, 275 days before disclosure).
- The latest release, 3.1.2, is not affected.
- 10% of clevertap-web-sdk downloads last week were affected versions (4.8K).

### [CVE-2026-26861](https://cve.now/CVE-2026-26861): CleverTap Web SDK version 1.15.2 and earlier is vulnerable to Cross-Site Scripting (XSS) via window.postMessage.

- Severity: High 8.3
- Published: Feb 27, 2026
- Affected: fixed in 1.15.3.
- Fixed in 1.15.3 (released May 28, 2025, 275 days before disclosure).
- The latest release, 3.1.2, is not affected.
- 10% of clevertap-web-sdk downloads last week were affected versions (4.8K).

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