{"id":"EUVD-2026-7521","enisaUuid":"95e4d3cb-9c59-38fb-ab03-477d6d16cef2","description":"svelte performance oriented web framework. Versions of svelte prior to 5.51.5 are vulnerable to cross-site scripting (XSS) during server-side rendering. When using spread syntax to render attributes from untrusted data, event handler properties are included in the rendered HTML output. If an application spreads user-controlled or external data as element attributes, an attacker can inject malicious event handlers that execute in victims\u0027 browsers. This vulnerability is fixed in 5.51.5.","datePublished":"Feb 20, 2026, 10:27:36 PM","dateUpdated":"Feb 23, 2026, 7:34:18 PM","baseScore":5.1,"baseScoreVersion":"4.0","baseScoreVector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N","references":"https://github.com/sveltejs/svelte/security/advisories/GHSA-f7gr-6p89-r883\n","aliases":"CVE-2026-27121\nGHSA-f7gr-6p89-r883\n","assigner":"GitHub_M","epss":0.22,"enisaIdProduct":[{"id":"38850bad-adef-34af-8715-ca59c640e7be","product":{"name":"svelte","vendor":{"name":"sveltejs"}},"product_version":"\u003c 5.51.5"}],"enisaIdVendor":[{"id":"d8cde6fb-d7ff-3499-85dc-15f8c8eaa3b3","vendor":{"name":"sveltejs"}}],"enisaIdVulnerability":[{"id":"365efd7f-227d-32fa-a30a-cabcf7d82b1a","vulnerability":{"id":"CVE-2026-27121","description":"svelte performance oriented web framework. Versions of svelte prior to 5.51.5 are vulnerable to cross-site scripting (XSS) during server-side rendering. When using spread syntax to render attributes from untrusted data, event handler properties are included in the rendered HTML output. If an application spreads user-controlled or external data as element attributes, an attacker can inject malicious event handlers that execute in victims\u0027 browsers. This vulnerability is fixed in 5.51.5.","datePublished":"Feb 20, 2026, 10:27:36 PM","dateUpdated":"Feb 23, 2026, 7:34:18 PM","status":"PUBLISHED","baseScore":5.1,"baseScoreVersion":"4.0","baseScoreVector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N","references":"https://github.com/sveltejs/svelte/security/advisories/GHSA-f7gr-6p89-r883\n","enisa_id":"EUVD-2026-7521\n","assigner":"GitHub_M","epss":0.22,"dataProcessed":"Nov 15, 2026, 7:21:11 AM","vulnerabilityProduct":[{"id":"e6ac2c1a-16cb-385b-8ed5-d58c631d21f7","product":{"name":"svelte","vendor":{"name":"sveltejs"}},"product_version":"\u003c 5.51.5"}],"vulnerabilityVendor":[{"id":"179d1ff8-c1e3-3bdc-bdc5-41adbf71e255","vendor":{"name":"sveltejs"}}]}},{"id":"bcd71ed8-87ea-3d7d-998e-cd1fde349570","vulnerability":{"id":"GHSA-f7gr-6p89-r883","description":"Svelte affected by cross-site scripting via spread attributes in Svelte SSR","datePublished":"Feb 19, 2026, 3:18:33 PM","dateUpdated":"Feb 23, 2026, 10:23:05 PM","baseScore":0.0,"references":"https://github.com/sveltejs/svelte/security/advisories/GHSA-f7gr-6p89-r883\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-27121\nhttps://github.com/sveltejs/svelte\n","enisa_id":"EUVD-2026-7521\n","aliases":"GHSA-f7gr-6p89-r883\nCVE-2026-27121\n","epss":0.0,"dataProcessed":"Nov 15, 2026, 2:48:04 AM","vulnerabilityProduct":[],"vulnerabilityVendor":[]}}],"enisaIdAdvisory":[]}