---
id: CVE-2026-75511
title: Novu provides an API for sending notifications through multiple channels
summary: >-
  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 override…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L'
cwe:
  - CWE-918
vendor: novuhq
product: novu
affected:
  - novu < 3.18.0
  - api-service < 3.18.0
published: '2026-09-22'
updated: '2026-09-26'
sourceUpdated: '2026-09-26T00:16:34.930'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-75511'
references:
  - url: >-
      https://github.com/novuhq/novu/commit/dabfd66457c0b98ad46a8186e69f74f570a990c2
    label: security-advisories@github.com
  - url: 'https://github.com/novuhq/novu/pull/11455'
    label: security-advisories@github.com
  - url: 'https://github.com/novuhq/novu/releases/tag/v3.18.0'
    label: security-advisories@github.com
  - url: 'https://github.com/novuhq/novu/security/advisories/GHSA-pg9q-8v57-hqph'
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-25T23:41:56.802710Z'
cvssSource: cna
epss: 0.00465
epssPercentile: 0.37623
ingestedAt: '2026-09-22T16:06:00.475Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.