{"id":"CVE-2026-75510","state":"PUBLISHED","title":"Novu: Stored XSS in In-App Inbox via notification redirect.url javascript: scheme","description":"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.","publishedAt":"2026-09-22T15:47:19.922Z","updatedAt":"2026-09-22T15:59:27.761Z","severity":{"score":5.1,"label":"Medium","version":"4.0","vector":"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","source":"GitHub_M"},"assigner":"GitHub_M","products":["novuhq novu"],"affected":[{"vendor":"novuhq","product":"novu","versions":[{"version":"< 3.18.0","status":"affected"}]}],"references":["https://github.com/novuhq/novu/security/advisories/GHSA-8gr3-5j6f-25gp","https://github.com/novuhq/novu/pull/11453","https://github.com/novuhq/novu/commit/f105f3d41a4405a75f803634d49f15a967524d8a","https://github.com/novuhq/novu/releases/tag/v3.18.0"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/75xxx/CVE-2026-75510.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-75510","state":"PUBLISHED","datePublished":"2026-09-22T15:47:19.922Z","dateUpdated":"2026-09-22T15:59:27.761Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-08-17T20:49:21.598Z"},"containers":{"cna":{"title":"Novu: Stored XSS in In-App Inbox via notification redirect.url javascript: scheme","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"novuhq","product":"novu","versions":[{"version":"< 3.18.0","status":"affected"}]}],"references":[{"url":"https://github.com/novuhq/novu/security/advisories/GHSA-8gr3-5j6f-25gp","name":"https://github.com/novuhq/novu/security/advisories/GHSA-8gr3-5j6f-25gp","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/novuhq/novu/pull/11453","name":"https://github.com/novuhq/novu/pull/11453","tags":["x_refsource_MISC"]},{"url":"https://github.com/novuhq/novu/commit/f105f3d41a4405a75f803634d49f15a967524d8a","name":"https://github.com/novuhq/novu/commit/f105f3d41a4405a75f803634d49f15a967524d8a","tags":["x_refsource_MISC"]},{"url":"https://github.com/novuhq/novu/releases/tag/v3.18.0","name":"https://github.com/novuhq/novu/releases/tag/v3.18.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"PASSIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","subAvailabilityImpact":"NONE","baseScore":5.1,"baseSeverity":"MEDIUM","vectorString":"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","lang":"en","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-22T15:47:19.922Z"},"source":{"advisory":"GHSA-8gr3-5j6f-25gp","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/novuhq/novu/security/advisories/GHSA-8gr3-5j6f-25gp","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-22T15:59:07.979961Z","id":"CVE-2026-75510","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-22T15:59:27.761Z"}}]}}}