Vulnerability · Published Sep 22, 2026 · Assigned by GitHub_M
CVE-2026-75510Novu: Stored XSS in In-App Inbox via notification redirect.url javascript: scheme
Medium 5.1
In plain English
A medium-severity cross-site scripting in novu from novuhq. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @novu/js | 3.18.0 | GHSA-8gr3-5j6f-25gp |
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
References
- https://github.com/novuhq/novu/security/advisories/GHSA-8gr3-5j6f-25gp x_refsource_CONFIRM
- https://github.com/novuhq/novu/pull/11453 x_refsource_MISC
- https://github.com/novuhq/novu/commit/f105f3d41a4405a75f803634d49f15a967524d8a x_refsource_MISC
- https://github.com/novuhq/novu/releases/tag/v3.18.0 x_refsource_MISC