CVE-2026-27902

MEDIUM EPSS 13.2%
Published Feb 26, 20264mo ago · Modified Jun 17, 20262w ago
5.3 CVSS 4.0
Medium
Find Similar
Published Feb 26, 2026 4mo ago
Last Modified Jun 17, 2026 2w ago

Description

Svelte performance oriented web framework. Prior to version 5.53.5, errors from `transformError` were not correctly escaped prior to being embedded in the HTML output, causing potential HTML injection and XSS if attacker-controlled content is returned from `transformError`. Version 5.53.5 fixes the issue.

CVSS Details

Base Score
5.3
Exploitability
—
Impact
—
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction P
Scope X

Threat Intelligence

EPSS Exploit Probability
13.2% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-79 Cross-site Scripting Injection

Affected Products 1

VendorProductVersionRange
sveltesvelte*≥5.53.0  –  <5.53.5

References 3

  • github.com https://github.com/sveltejs/svelte/commit/0298e979371bb583855c9810db79a70a551d22b9
    Patch
  • github.com https://github.com/sveltejs/svelte/releases/tag/svelte%405.53.5
    Release Notes
  • github.com https://github.com/sveltejs/svelte/security/advisories/GHSA-qgvg-pr8v-6rr3
    Vendor Advisory

Remediation

  • github.com https://github.com/sveltejs/svelte/commit/0298e979371bb583855c9810db79a70a551d22b9
    Patch