Medium 5.3Published Sep 22, 2026

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

Updated under an hour ago (2026-10-19 09:20 UTC)

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Exploited in the last 30 days

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.

CVSS: 5.3 MEDIUM (v4.0, CNA)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
Weakness (CWE): CWE-918
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Sep 25, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

novuhq novu novuhq:novu (from the name)	before 3.18.0	CNA record
@novu api-service novu:api_service (from the name)	before 3.18.0	CNA record

References

https://github.com/novuhq/novu/security/advisories/GHSA-pg9q-8v57-hqphx-refsource-confirm
https://github.com/novuhq/novu/pull/11455x-refsource-misc
https://github.com/novuhq/novu/commit/dabfd66457c0b98ad46a8186e69f74f570a990c2x-refsource-misc
https://github.com/novuhq/novu/releases/tag/v3.18.0x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.