CVE-2026-42573mediumCWE-79

CVE-2026-42573: medium-severity vulnerability in sveltejs svelte

Svelte: XSS via DOM Clobbering of Internal Framework State

Published · Updated

Follow this CVE+ Monitor svelte+ Monitor svelte

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 5.3epss 0.3%
Svelte is a performance oriented web framework. Prior to version 5.55.7, Svelte was vulnerable to DOM clobbering of its internal framework state on elements, potentially leading to XSS attacks. This issue has been patched in version 5.55.7.
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N
Affected products
sveltejs · svelte
Related CVEs — sveltejs svelte

In the same product, most dangerous first.

CVE-2026-42567MEDIUMSvelte: ReDoS in `<svelte:element>` Tag ValidationEPSS 0.5%CVE-2026-27125MEDIUMSvelte SSR attribute spreading includes inherited properties from prototype chainEPSS 0.4%CVE-2024-45047MEDIUMPotential mXSS vulnerability due to improper HTML escaping in svelteEPSS 0.4%CVE-2026-27902MEDIUMSvelte Vulnerable to XSS via HTML Comment Injection in SSR Error Boundary Hydration MarkersEPSS 0.3%CVE-2026-27901MEDIUMSvelte vulnerable to XSS during SSR with contenteditable `bind:innerText` and `bind:textContent`EPSS 0.3%CVE-2026-27122MEDIUMSvelte SSR does not validate dynamic element tag names in `<svelte:element>`EPSS 0.2%