{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-42455", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-04-27T13:55:58.693Z", "datePublished": "2026-05-08T23:10:11.218Z", "dateUpdated": "2026-05-12T02:19:23.519Z"}, "containers": {"cna": {"title": "LinkWarden: Stored XSS via Client-Side Archive Upload (Unsanitized HTML served from same origin)", "problemTypes": [{"descriptions": [{"cweId": "CWE-79", "lang": "en", "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 8.8, "baseSeverity": "HIGH", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/linkwarden/linkwarden/security/advisories/GHSA-fjvg-mch3-j3vg", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/linkwarden/linkwarden/security/advisories/GHSA-fjvg-mch3-j3vg"}], "affected": [{"vendor": "linkwarden", "product": "linkwarden", "versions": [{"version": "<= 2.14.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-05-08T23:10:11.218Z"}, "descriptions": [{"lang": "en", "value": "Linkwarden is a self-hosted, open-source collaborative bookmark manager to collect, organize and archive webpages. In versions 2.14.0 and prior, the archive upload endpoint (POST /api/v1/archives/[linkId]?format=4) accepts HTML files (text/html) without sanitizing JavaScript content. When the archive is later accessed via GET /api/v1/archives/[linkId]?format=4, the HTML is served with Content-Type: text/html from the Linkwarden origin, without any Content-Security-Policy header. This allows arbitrary JavaScript execution in the context of the authenticated Linkwarden sessio. At time of publication, there are no publicly available patches."}], "source": {"advisory": "GHSA-fjvg-mch3-j3vg", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/linkwarden/linkwarden/security/advisories/GHSA-fjvg-mch3-j3vg", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-12T02:18:41.572672Z", "id": "CVE-2026-42455", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-12T02:19:23.519Z"}}]}}

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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2.14.0]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "linkwarden", "source": "cna", "vendor": "linkwarden"}, "product": "linkwarden", "vendor": "linkwarden"}], "created": "2026-05-09T01:30:16.181082+00:00", "updated": "2026-05-10T21:24:38.215558+00:00", "vendors": ["linkwarden", "linkwarden$PRODUCT$linkwarden"]}