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Novu: Stored XSS in In-App Inbox via notification redirect.url javascript: scheme

Type: advisorySources: OSV

Novu provides an API for sending notifications through multiple channels. Prior to 3.18.0, Novu's @novu/js In-App Inbox and the @novu/react Inbox component accept a notification call-to-action redirect.url from the v1 cta.data object and pass it through apps/api/src/app/inbox/utils/notification-mapper.ts and packages/js/src/ui/components/Notification/DefaultNotification.tsx to the navigate function in packages/js/src/ui/context/InboxContext.tsx without validating its URL scheme. An authenticated organization member or environment API-key holder can store a javascript: redirect with target _self in an in-app workflow. When a recipient using a Chromium-based browser clicks the notification, window.open executes the redirect in the current inbox-hosting origin, which can expose session material and permit authenticated actions in a customer application or the self-hosted Novu dashboard. This issue is fixed in version 3.18.0.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-75510
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 01:15 UTC · Revision 1

Source evidence

Novu: Stored XSS in In-App Inbox via notification redirect.url javascript: scheme

core-osv · Original source

Published 22 Sept 2026, 15:47 UTC

Novu provides an API for sending notifications through multiple channels. Prior to 3.18.0, Novu's @novu/js In-App Inbox and the @novu/react Inbox component accept a notification call-to-action redirect.url from the v1 cta.data object and pass it through apps/api/src/app/inbox/utils/notification-mapper.ts and packages/js/src/ui/components/Notification/DefaultNotification.tsx to the navigate function in packages/js/src/ui/context/InboxContext.tsx without validating its URL scheme. An authenticated organization member or environment API-key holder can store a javascript: redirect with target _self in an in-app workflow. When a recipient using a Chromium-based browser clicks the notification, window.open executes the redirect in the current inbox-hosting origin, which can expose session material and permit authenticated actions in a customer application or the self-hosted Novu dashboard. This issue is fixed in version 3.18.0.

osv:CVE-2026-75510
Complete source record
{
  "id": "692728a145e6f9f0a8bacae37f1a04b759eca826b12d6028e37245351e9c378c",
  "url": "https://osv.dev/vulnerability/CVE-2026-75510",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Novu: Stored XSS in In-App Inbox via notification redirect.url javascript: scheme",
    "summary": "Novu provides an API for sending notifications through multiple channels. Prior to 3.18.0, Novu's @novu/js In-App Inbox and the @novu/react Inbox component accept a notification call-to-action redirect.url from the v1 cta.data object and pass it through apps/api/src/app/inbox/utils/notification-mapper.ts and packages/js/src/ui/components/Notification/DefaultNotification.tsx to the navigate function in packages/js/src/ui/context/InboxContext.tsx without validating its URL scheme. An authenticated organization member or environment API-key holder can store a javascript: redirect with target _self in an in-app workflow. When a recipient using a Chromium-based browser clicks the notification, window.open executes the redirect in the current inbox-hosting origin, which can expose session material and permit authenticated actions in a customer application or the self-hosted Novu dashboard. This issue is fixed in version 3.18.0.",
    "evidence": "osv:CVE-2026-75510",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-75510",
      "aliases": [
        "CVE-2026-75510",
        "GHSA-8gr3-5j6f-25gp"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/novuhq/novu",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "be515aea98961762f6e37a4a55175b900ec03e84"
                },
                {
                  "fixed": "f105f3d41a4405a75f803634d49f15a967524d8a"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.18.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f105f3d41a4405a75f803634d49f15a967524d8a"
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                    "source": "REFERENCES_COMMIT"
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                    "source": "REFERENCES_TAG",
                    "original_tag": "v3.18.0"
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            "@novu/react@v3.17.0",
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            "@novu/react@v3.7.0",
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            "@novu/react@v3.9.2",
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            "@novu/js@v3.9.2",
            "@novu/react@v3.9.1",
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-75510.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:24.926415035Z",
      "provider": "osv",
      "references": [
        "https://github.com/novuhq/novu/releases/tag/v3.18.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75510.json",
        "https://github.com/novuhq/novu/security/advisories/GHSA-8gr3-5j6f-25gp",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-75510",
        "https://github.com/novuhq/novu/commit/f105f3d41a4405a75f803634d49f15a967524d8a",
        "https://github.com/novuhq/novu/pull/11453"
      ],
      "provider_metadata": {
        "cwe_ids": [
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        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75510.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-75510",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 491511,
  "published_at": "2026-09-22T15:47:19.922+00:00"
}