CVE-2026-27902 | BDVDB-2026-317547 Detail

sveltejssvelte

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.

Impact#

Per CVSS v4.0: confidentiality impact low, integrity impact none, availability impact none. Attack vector: network.

Weaknesses#

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

References#

Exploit#

No public exploit known

History#

Version 12026-02-26Record published in the CVE List.

Published

Published: 2026-02-26
Last modified: 2026-02-26

Vendor information

Vendor: sveltejs
Product: svelte

All sveltejs vulnerabilities

Score

5.3 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 19.7.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Cross-Site Scripting

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 5.53.0, < 5.53.5
Fixed
Not stated

Scoring System

CVSS v4.0

5.3 Medium

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

Metric breakdown
Attack Vector	Network
Attack Complexity	High
Attack Requirements	Present
Privileges Required	None
User Interaction	Passive
Vulnerable System Confidentiality	Low
Vulnerable System Integrity	None
Vulnerable System Availability	None
Subsequent System Confidentiality	High
Subsequent System Integrity	High
Subsequent System Availability	None

CVSS v3.1

Not available

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).