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CVE-2026-75511— Novu: Server-Side Request Forgery (SSRF) via Chat Provider Webhook URLs

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 accepts chat webhook URLs from subscriber credentials.webhookUrl, channel endpoint endpoint.url, event payload.webhookUrl, and event overrides.webhookUrl, then pass

CVSS 5.3 · Medium

Affected Version Matrix 2

VendorProduct Version RangeStatus
@novu api-service < 3.18.0 affected
novuhq novu < 3.18.0 affected
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I. Basic Information for CVE-2026-75511

Vulnerability Information

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Vulnerability Title
Novu: Server-Side Request Forgery (SSRF) via Chat Provider Webhook URLs
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
novuhq novu < 3.18.0 -
@novu api-service < 3.18.0 -

II. Public POCs for CVE-2026-75511

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III. Intelligence Information for CVE-2026-75511

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Patches & Fixes for CVE-2026-75511 (1)

Other References for CVE-2026-75511 (2)

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

CVE-2026-75517 6.5 MEDIUM Novu: Cross-Environment Integration Manipulation (IDOR)
CVE-2026-75510 5.1 MEDIUM Novu: Stored XSS in In-App Inbox via notification redirect.url javascript: scheme

IV. Related Vulnerabilities

Same product: novu
Same vendor: novuhq
Same weakness: CWE-918

V. Comments for CVE-2026-75511

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