Vulnerability · Published Feb 26, 2026 · Assigned by GitHub_M

CVE-2026-27901Svelte vulnerable to XSS during SSR with contenteditable `bind:innerText` and `bind:textContent`

Medium 5.3

In plain English

A medium-severity cross-site scripting in svelte from sveltejs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)5.3Medium

Exploit odds (30 days)0.3%top 82.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Svelte performance oriented web framework. Prior to version 5.53.5, the contents of `bind:innerText` and `bind:textContent` on `contenteditable` elements were not properly escaped. This could enable HTML injection and Cross-Site Scripting (XSS) if rendering untrusted data as the binding's initial value on the server. Version 5.53.5 fixes the issue.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	svelte	5.53.5	GHSA-phwv-c562-gvmh

Affected products (as reported)

Vendor	Product	Versions
sveltejs	svelte	< 5.53.5

Weakness: CWE-79 · Vector: 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

References

https://github.com/sveltejs/svelte/security/advisories/GHSA-phwv-c562-gvmh x_refsource_CONFIRM
https://github.com/sveltejs/svelte/commit/0df5abcae223058ceb95491470372065fb87951d x_refsource_MISC
https://github.com/sveltejs/svelte/releases/tag/svelte%405.53.5 x_refsource_MISC