What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-26 · updated 2026-06-17
• Weakness: CWE-79

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 products

• sveltejs svelte: before 5.53.5; 5.53.5 — fixed in 5.53.5

How to fix

Upgrade to a fixed version: sveltejs svelte 5.53.5. Check the vendor advisory for mitigations.

References

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

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