GHSA-26wg-9xf2-q495: Novu has a XSS sanitization bypass

April 14, 2026

XSS sanitization is incomplete, some attributes are missing such as oncontentvisibilityautostatechange=. This allows for the email preview to render HTML that executes arbitrary JavaScript,

References

github.com/advisories/GHSA-26wg-9xf2-q495
github.com/novuhq/novu
github.com/novuhq/novu/security/advisories/GHSA-26wg-9xf2-q495

Code Behaviors & Features

Detect and mitigate GHSA-26wg-9xf2-q495 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →