Vulnerability Description
Novu provides an API for sending notifications through multiple channels. Prior to 3.18.0, Novu accepts chat webhook URLs from subscriber credentials.webhookUrl, channel endpoint endpoint.url, event payload.webhookUrl, and event overrides.webhookUrl, then passes the selected endpoint.url through send-message-chat.usecase.ts to raw HTTP requests in the Slack, Discord, Mattermost, Microsoft Teams, Grafana On-Call, Ryver, Rocket.Chat, GetStream, and Zulip providers. An authenticated user can supply an internal or otherwise restricted destination because these paths do not apply normalizeOutboundHttpUrl, assertSafeOutboundUrl, or the DNS-pinned safeOutboundJsonRequest protection used by the generic webhook providers. The Novu worker can consequently issue attacker-directed POST requests to internal network services and cause interactions or actions supported by those services. This issue is fixed in version 3.18.0.
Related Weaknesses (CWE)
References
- https://github.com/novuhq/novu/commit/dabfd66457c0b98ad46a8186e69f74f570a990c2
- https://github.com/novuhq/novu/pull/11455
- https://github.com/novuhq/novu/releases/tag/v3.18.0
- https://github.com/novuhq/novu/security/advisories/GHSA-pg9q-8v57-hqph
FAQ
What is CVE-2026-75511?
CVE-2026-75511 is a documented vulnerability. Novu provides an API for sending notifications through multiple channels. Prior to 3.18.0, Novu accepts chat webhook URLs from subscriber credentials.webhookUrl, channel endpoint endpoint.url, event p...
How severe is CVE-2026-75511?
CVSS scoring is not yet available for CVE-2026-75511. Check NVD for updates.
Is there a patch for CVE-2026-75511?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.