{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-27902", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-02-24T15:19:29.718Z", "datePublished": "2026-02-26T00:58:54.604Z", "dateUpdated": "2026-02-26T18:51:39.142Z"}, "containers": {"cna": {"title": "Svelte Vulnerable to XSS via HTML Comment Injection in SSR Error Boundary Hydration Markers", "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": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "subAvailabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/sveltejs/svelte/security/advisories/GHSA-qgvg-pr8v-6rr3", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/sveltejs/svelte/security/advisories/GHSA-qgvg-pr8v-6rr3"}, {"name": "https://github.com/sveltejs/svelte/commit/0298e979371bb583855c9810db79a70a551d22b9", "tags": ["x_refsource_MISC"], "url": "https://github.com/sveltejs/svelte/commit/0298e979371bb583855c9810db79a70a551d22b9"}, {"name": "https://github.com/sveltejs/svelte/releases/tag/svelte%405.53.5", "tags": ["x_refsource_MISC"], "url": "https://github.com/sveltejs/svelte/releases/tag/svelte%405.53.5"}], "affected": [{"vendor": "sveltejs", "product": "svelte", "versions": [{"version": ">= 5.53.0, < 5.53.5", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-02-26T00:58:54.604Z"}, "descriptions": [{"lang": "en", "value": "Svelte performance oriented web framework. Prior to version 5.53.5, errors from `transformError` were not correctly escaped prior to being embedded in the HTML output, causing potential HTML injection and XSS if attacker-controlled content is returned from `transformError`. Version 5.53.5 fixes the issue."}], "source": {"advisory": "GHSA-qgvg-pr8v-6rr3", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-02-26T18:51:28.889254Z", "id": "CVE-2026-27902", "options": [{"Exploitation": "none"}, {"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": "2026-02-26T18:51:39.142Z"}}]}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "Svelte performance oriented web framework. Prior to version 5.53.5, errors from `transformError` were not correctly escaped prior to being embedded in the HTML output, causing potential HTML injection and XSS if attacker-controlled content is returned from `transformError`. Version 5.53.5 fixes the issue."}], "id": "CVE-2026-27902", "lastModified": "2026-02-26T02:16:21.170", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "userInteraction": "PASSIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-02-26T02:16:21.170", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/sveltejs/svelte/commit/0298e979371bb583855c9810db79a70a551d22b9"}, {"source": "security-advisories@github.com", "url": "https://github.com/sveltejs/svelte/releases/tag/svelte%405.53.5"}, {"source": "security-advisories@github.com", "url": "https://github.com/sveltejs/svelte/security/advisories/GHSA-qgvg-pr8v-6rr3"}], "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": "[5.53.0,5.53.5)"}}], "enrichment": {"confidence": 93.0, "confidence_source": "matching", "scores": [{"score": 93.0, "source": "matching"}]}, "original": {"product": "svelte", "source": "cna", "vendor": "sveltejs"}, "product": "svelte", "vendor": "svelte"}], "created": "2026-02-26T13:10:10.552575+00:00", "updated": "2026-02-26T13:10:10.552657+00:00", "vendors": ["svelte", "svelte$PRODUCT$svelte"]}