PT-2026-22077 · Svelte · Svelte

Maksyche · Published 2026-02-26 · Updated 2026-03-05 · CVE-2026-27902

Positive Technologies (AI Summary)

CVSS v3.1

5.4

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Svelte versions prior to 5.53.5

Description Errors originating from the transformError function were not properly sanitized before being included in the HTML output. This could lead to potential HTML injection and cross-site scripting (XSS) if the transformError function returns content controlled by an attacker. The transformError function is responsible for handling and formatting errors during the transformation process.

Recommendations Update to Svelte version 5.53.5 or later.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-27902

GHSA-QGVG-PR8V-6RR3

Affected Products

Svelte

References · 13

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27902.json · Exploit
• https://github.com/sveltejs/svelte/security/advisories/GHSA-qgvg-pr8v-6rr3 · Vendor Advisory
• https://github.com/sveltejs/svelte/commit/0298e979371bb583855c9810db79a70a551d22b9 · Patch
• https://osv.dev/vulnerability/CVE-2026-27902 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-qgvg-pr8v-6rr3 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-27902 · Security Note
• https://github.com/sveltejs/svelte · Note
• https://github.com/sveltejs/svelte/releases/tag/svelte%405.53.5 · Note
• https://github.com/sveltejs/svelte/releases/tag/svelte@5.53.5 · Note
• https://twitter.com/_cvereports/status/2027151769424290112 · Twitter Post
• https://t.me/cveNotify/154329 · Telegram Post
• https://twitter.com/VulmonFeeds/status/2026985783102488798 · Twitter Post
• https://twitter.com/CVEnew/status/2027004231039779088 · Twitter Post