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CVE-2026-75510— Novu: Stored XSS in In-App Inbox via notification redirect.url javascript: scheme

Quick assessment

Affected
novuhq novu
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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/a

CVSS 5.1 · Medium
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I. Basic Information for CVE-2026-75510

Vulnerability Information

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Vulnerability Title
Novu: Stored XSS in In-App Inbox via notification redirect.url javascript: scheme
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
novuhq novu < 3.18.0 -

II. Public POCs for CVE-2026-75510

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III. Intelligence Information for CVE-2026-75510

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Patches & Fixes for CVE-2026-75510 (2)

Other References for CVE-2026-75510 (2)

Same Patch Batch · novuhq · 2026-09-22 · 3 CVEs total

CVE-2026-75517 6.5 MEDIUM Novu: Cross-Environment Integration Manipulation (IDOR)
CVE-2026-75511 5.3 MEDIUM Novu: Server-Side Request Forgery (SSRF) via Chat Provider Webhook URLs

IV. Related Vulnerabilities

Same product: novu
Same vendor: novuhq
Same weakness: CWE-79

V. Comments for CVE-2026-75510

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