{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-31876", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-09T19:02:25.014Z", "datePublished": "2026-03-11T18:17:08.142Z", "dateUpdated": "2026-03-11T18:17:08.142Z"}, "containers": {"cna": {"title": "Notesnook has Stored XSS via unsanitized Twitter/X embed URL in editor (`tweetToEmbed`)", "problemTypes": [{"descriptions": [{"cweId": "CWE-79", "lang": "en", "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/streetwriters/notesnook/security/advisories/GHSA-jprx-2w2h-4rh5", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/streetwriters/notesnook/security/advisories/GHSA-jprx-2w2h-4rh5"}, {"name": "https://github.com/streetwriters/notesnook/commit/e87f5e5f899f45df28d7c0f33f15e9178d1fbcb7", "tags": ["x_refsource_MISC"], "url": "https://github.com/streetwriters/notesnook/commit/e87f5e5f899f45df28d7c0f33f15e9178d1fbcb7"}], "affected": [{"vendor": "streetwriters", "product": "notesnook", "versions": [{"version": "< 3.3.9", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-11T18:17:08.142Z"}, "descriptions": [{"lang": "en", "value": "Notesnook is a note-taking app focused on user privacy & ease of use. Prior to 3.3.9, a Stored Cross-Site Scripting (XSS) vulnerability existed in Notesnook's editor embed component when rendering Twitter/X embed URLs. The tweetToEmbed() function in component.tsx interpolated the user-supplied URL directly into an HTML string without escaping, which was then assigned to the srcdoc attribute of an <iframe>. This vulnerability is fixed in 3.3.9."}], "source": {"advisory": "GHSA-jprx-2w2h-4rh5", "discovery": "UNKNOWN"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "Notesnook is a note-taking app focused on user privacy & ease of use. Prior to 3.3.9, a Stored Cross-Site Scripting (XSS) vulnerability existed in Notesnook's editor embed component when rendering Twitter/X embed URLs. The tweetToEmbed() function in component.tsx interpolated the user-supplied URL directly into an HTML string without escaping, which was then assigned to the srcdoc attribute of an <iframe>. This vulnerability is fixed in 3.3.9."}], "id": "CVE-2026-31876", "lastModified": "2026-03-11T19:16:04.140", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.3, "impactScore": 2.7, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-03-11T19:16:04.140", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/streetwriters/notesnook/commit/e87f5e5f899f45df28d7c0f33f15e9178d1fbcb7"}, {"source": "security-advisories@github.com", "url": "https://github.com/streetwriters/notesnook/security/advisories/GHSA-jprx-2w2h-4rh5"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.3.9)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "notesnook", "source": "cna", "vendor": "streetwriters"}, "product": "notesnook", "vendor": "streetwriters"}], "created": "2026-03-12T09:57:22.749990+00:00", "updated": "2026-03-12T09:57:22.750096+00:00", "vendors": ["streetwriters", "streetwriters$PRODUCT$notesnook"]}