Medium severity · published Jun 9, 2026
CVE-2026-42573
Svelte: XSS via DOM Clobbering of Internal Framework State
6.1
CVSS
0.3%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 28% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SV
svelte · sveltejs
< 5.55.7 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-42573
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-42573
Product
https://github.com/sveltejs/svelte/releases/tag/svelte%405.55.7
Vendor Advisory
https://github.com/sveltejs/svelte/security/advisories/GHSA-rcqx-6q8c-2c42
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-42573
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2487093
security.access.redhat.com
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42573.json
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