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

Type: advisorySources: OSV

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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-75511
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 03:33 UTC · Revision 1

Source evidence

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

core-osv · Original source

Published 22 Sept 2026, 15:49 UTC

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.

osv:CVE-2026-75511
Complete source record
{
  "id": "9b0b97ea0842b59b366b0715f74b02e77b01256dbbcaa53e384ad20e29ff6ac0",
  "url": "https://osv.dev/vulnerability/CVE-2026-75511",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Novu: Server-Side Request Forgery (SSRF) via Chat Provider Webhook URLs",
    "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 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.",
    "evidence": "osv:CVE-2026-75511",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-75511",
      "aliases": [
        "CVE-2026-75511",
        "GHSA-pg9q-8v57-hqph"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "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"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/novuhq/novu",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "be515aea98961762f6e37a4a55175b900ec03e84"
                },
                {
                  "fixed": "dabfd66457c0b98ad46a8186e69f74f570a990c2"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.18.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "dabfd66457c0b98ad46a8186e69f74f570a990c2"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "be515aea98961762f6e37a4a55175b900ec03e84"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v3.18.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.17.0",
            "@novu/react@v3.17.0",
            "@novu/react-native@v3.17.0",
            "@novu/nextjs@v3.17.0",
            "@novu/js@v3.17.0",
            "@novu/react@v3.16.0",
            "@novu/react-native@v3.16.0",
            "@novu/nextjs@v3.16.0",
            "@novu/js@v3.16.0",
            "@novu/react@v3.15.0",
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            "@novu/nextjs@v3.15.0",
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            "v3.15.0",
            "v3.14.0",
            "@novu/react@v3.14.1",
            "@novu/react-native@v3.14.1",
            "@novu/nextjs@v3.14.1",
            "@novu/js@v3.14.1",
            "@novu/react@v3.14.0",
            "@novu/react-native@v3.14.0",
            "@novu/nextjs@v3.14.0",
            "@novu/js@v3.14.0",
            "v3.13.0",
            "@novu/react@v3.13.0",
            "@novu/react-native@v3.13.0",
            "@novu/nextjs@v3.13.0",
            "@novu/js@v3.13.0",
            "v3.12.0",
            "@novu/react@v3.12.0",
            "@novu/react-native@v3.12.0",
            "@novu/nextjs@v3.12.0",
            "@novu/js@v3.12.0",
            "@novu/react@v3.11.2",
            "@novu/react-native@v3.11.2",
            "@novu/nextjs@v3.11.2",
            "@novu/js@v3.11.2",
            "@novu/react@v3.11.0",
            "@novu/react-native@v3.11.0",
            "@novu/nextjs@v3.11.0",
            "@novu/js@v3.11.0",
            "@novu/framework@2.9.0",
            "@novu/framework@2.8.0",
            "@novu/react@v3.8.1",
            "@novu/react-native@v3.8.1",
            "@novu/nextjs@v3.8.1",
            "@novu/js@v3.8.1",
            "@novu/react@v3.7.0",
            "@novu/react-native@v3.7.0",
            "@novu/nextjs@v3.7.0",
            "@novu/js@v3.7.0",
            "@novu/react@v3.10.1",
            "@novu/react-native@v3.10.1",
            "@novu/nextjs@v3.10.1",
            "@novu/js@v3.10.1",
            "@novu/react@v3.10.0",
            "@novu/react-native@v3.10.0",
            "@novu/nextjs@v3.10.0",
            "@novu/js@v3.10.0",
            "@novu/react@v3.9.3",
            "@novu/react-native@v3.9.3",
            "@novu/nextjs@v3.9.3",
            "@novu/js@v3.9.3",
            "@novu/react@v3.9.2",
            "@novu/react-native@v3.9.2",
            "@novu/nextjs@v3.9.2",
            "@novu/js@v3.9.2",
            "@novu/react@v3.9.1",
            "@novu/react-native@v3.9.1",
            "@novu/nextjs@v3.9.1",
            "@novu/js@v3.9.1",
            "@novu/react@v3.4.0",
            "@novu/react-native@v3.4.0",
            "@novu/nextjs@v3.4.0",
            "@novu/js@v3.4.0",
            "@novu/react@v3.3.1",
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            "@novu/nextjs@v3.3.1",
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            "@novu/react@v3.3.0",
            "@novu/react-native@v3.3.0",
            "@novu/nextjs@v3.3.0",
            "@novu/js@v3.3.0",
            "@novu/react@v3.2.0",
            "@novu/react-native@v3.2.0",
            "@novu/nextjs@v3.2.0",
            "@novu/js@v3.2.0",
            "@novu/react@v3.0.3",
            "@novu/react-native@v3.0.3",
            "@novu/nextjs@v3.0.3",
            "@novu/js@v3.0.3",
            "novu@2.6.5",
            "@novu/stateless@2.6.5",
            "@novu/shared@2.6.5",
            "@novu/react@2.6.5",
            "@novu/react-native@2.6.5",
            "@novu/providers@2.6.5",
            "@novu/node@2.6.5",
            "@novu/nextjs@2.6.5",
            "@novu/js@2.6.5",
            "@novu/headless@2.6.5",
            "@novu/framework@2.6.5",
            "@novu/client@2.6.5",
            "@novu/api@2.6.5",
            "v2.0.1",
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            "v0.16.4",
            "v0.14.0",
            "v0.11.0",
            "v0.10.0",
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            "v0.7.3",
            "v0.7.2",
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            "v0.7.0",
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            "v0.5.1",
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            "v0.4.1",
            "v0.4.1-alpha.0",
            "v0.4.0-alpha.12",
            "v0.4.0-alpha.11",
            "v0.4.0-alpha.10",
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            "v0.1.1",
            "v0.0.4",
            "v0.0.2",
            "v1.0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-75511.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.824674391Z",
      "provider": "osv",
      "references": [
        "https://github.com/novuhq/novu/releases/tag/v3.18.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75511.json",
        "https://github.com/novuhq/novu/security/advisories/GHSA-pg9q-8v57-hqph",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-75511",
        "https://github.com/novuhq/novu/commit/dabfd66457c0b98ad46a8186e69f74f570a990c2",
        "https://github.com/novuhq/novu/pull/11455"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-918"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75511.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-75511",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 500037,
  "published_at": "2026-09-22T15:49:37.481+00:00"
}