CVE-2026-27902

medium

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.

References

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

https://github.com/sveltejs/svelte/releases/tag/svelte%405.53.5

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

Details

Source: Mitre, NVD

Published: 2026-02-26

Updated: 2026-03-05

Risk Information

CVSS v2

Base Score: 6.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 5.4

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Severity: Medium

CVSS v4

Base Score: 5.3

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

Severity: Medium

EPSS

EPSS: 0.00045