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[ CVE-2026-75510 · Published 22 Sep 2026 ]

Novu: Stored XSS in In-App Inbox via notification redirect.url javascript: scheme

CVSS 5.1 EPSS <1%Fix available

[ Why it matters ]Priority signals

  • Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official description

Novu provides an API for sending notifications through multiple channels. Prior to 3.18.0, Novu's @novu/js In-App Inbox and the @novu/react Inbox component accept a notification call-to-action redirect.url from the v1 cta.data object and pass it through apps/api/src/app/inbox/utils/notification-mapper.ts and packages/js/src/ui/components/Notification/DefaultNotification.tsx to the navigate function in packages/js/src/ui/context/InboxContext.tsx without validating its URL scheme. An authenticated organization member or environment API-key holder can store a javascript: redirect with target _self in an in-app workflow. When a recipient using a Chromium-based browser clicks the notification, window.open executes the redirect in the current inbox-hosting origin, which can expose session material and permit authenticated actions in a customer application or the self-hosted Novu dashboard. This issue is fixed in version 3.18.0.

[ Fixes ]Fixes and patches

  • @novu/js 3.18.0Fixed version · GitHub Advisories · npm package @novu/js: upgrade to 3.18.0 or later (affected <= 3.17.0)

[ Packages ]Affected open-source packages

[ References ]References