CVE-2026-27902 | THREATINT

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.

PUBLISHED Reserved 2026-02-24 | Published 2026-02-26 | Updated 2026-02-26 | Assigner GitHub_M

MEDIUM: 5.3CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

>= 5.53.0, < 5.53.5

affected

References

github.com/...svelte/security/advisories/GHSA-qgvg-pr8v-6rr3

github.com/...ommit/0298e979371bb583855c9810db79a70a551d22b9

github.com/sveltejs/svelte/releases/tag/svelte@5.53.5

cve.org (CVE-2026-27902)

nvd.nist.gov (CVE-2026-27902)

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