Quick answers
- Is CVE-2025-51684 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2025-51684 being exploited in the wild.
- How severe is CVE-2025-51684?
- Informational severity, published 30 July 2026.
- Which products and versions are affected?
- CleverTap Web SDK 1.15.1.
- Is there a fix for CVE-2025-51684?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2025-51684 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2025-51684?
- Check whether you run CleverTap Web SDK at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A DOM-based Cross-Site Scripting (XSS) vulnerability exists in CleverTap Web SDK v1.15.1. The vulnerability stems from the SDK's failure to validate or sanitize the origin and content of messages received through the 'window.postMessage' interface. Specifically, the 'renderCustomHtml' function processes untrusted data from these messages and injects it directly into the Document Object Model (DOM). An attacker can exploit this by crafting a malicious message that, when received by a site using the vulnerable SDK, executes arbitrary JavaScript. This can occur without authentication if the attacker can trigger a postMessage to the target window, typically via a malicious site or iframe.
Affected products
- CleverTap Web SDK 1.15.1
Timeline
- 2026-07-30: disclosed
- 2026-07-30: advisory