Novu up to 3.17.x Webhook send-message-chat.usecase.ts webhookUrl redirect

Summaryinfo

A vulnerability classified as problematic has been found in Novu up to 3.17.x. This impacts an unknown function of the file send-message-chat.usecase.ts of the component Webhook. This manipulation of the argument webhookUrl causes redirect. This vulnerability is registered as CVE-2026-75511. Remote exploitation of the attack is possible. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Novu up to 3.17.x and classified as problematic. Affected by this vulnerability is some unknown processing of the file send-message-chat.usecase.ts of the component Webhook. The manipulation of the argument webhookUrl with an unknown input leads to a redirect vulnerability. The CWE definition for the vulnerability is CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. As an impact it is known to affect integrity. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-75511 since 08/17/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1204.001 for this issue.

Upgrading to version 3.18.0 eliminates this vulnerability.

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Productinfo

Name

• Novu

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12
• 3.13
• 3.14
• 3.15
• 3.16
• 3.17

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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