# CVE-2026-27901: svelte XSS — Fixed in 5.53.5

📦 npm

Not in CISA KEV

# CVE-2026-27901 — svelte

[Fix: sveltejs/svelte@0df5abc](https://github.com/sveltejs/svelte/commit/0df5abcae223058ceb95491470372065fb87951d)

CVE-2026-27901 is a Cross-site Scripting (XSS) vulnerability in svelte. A fix is available for svelte — see the affected versions and patch details below.

Svelte vulnerable to XSS during SSR with contenteditable \`bind:innerText\` and \`bind:textContent\`

Also known as[GHSA-phwv-c562-gvmh](/vulnerability/GHSA-phwv-c562-gvmh)

Published

Feb 26, 2026

Updated

Oct 28, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

## Exploitation Status

### No confirmed exploitation observed yet

-   CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-27901.

## EPSS Exploitation Probability

[via FIRST.org ↗](https://www.first.org/epss/)

0.3%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs17th percentile — riskier than 17% of all scored CVEsHighest risk

0.00%0.30%0.59%0.89%0.0%0.3%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from [FIRST.org EPSS](https://www.first.org/epss/).

## Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

2Kother npm packages depend on this — each one inherits the vulnerability until it's patched upstream

`svelte`npm

9.1Mdownloads / week

## 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

1 total 1 fixed

Ecosystem

Package

Vulnerable range

Fix

📦npm

`svelte` 

all versions

5.53.5`npm install svelte@5.53.5`

## Affected Products

1 product · 2 configurations

Application

`svelte`svelte

< 5.53.5

1 version

5.53.5

## Detection & mitigation playbook

Open-source dependency

1.  ### Detect
    
    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for svelte, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
    
2.  ### Fix
    
    Update svelte to 5.53.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-27901 is resolved across your whole dependency graph.
    
3.  ### Workarounds
    
    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.
    

## Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate

Workaround published by Red Hat

> Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Source: [Red Hat security advisory for CVE-2026-27901](https://access.redhat.com/security/cve/cve-2026-27901) (CC BY 4.0)

## Frequently Asked Questions

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.

O3 Security · Impact-Aware SCA

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