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CVE Vulnerability Details :
CVE-2026-27902
PUBLISHED
More InfoOfficial Page
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
View Known Exploited Vulnerability (KEV) details
Published At-26 Feb, 2026 | 00:58
Updated At-26 Feb, 2026 | 18:51
Rejected At-
▼CVE Numbering Authority (CNA)
Svelte Vulnerable to XSS via HTML Comment Injection in SSR Error Boundary Hydration Markers

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.

Affected Products
Vendor
sveltejs
Product
svelte
Versions
Affected
  • >= 5.53.0, < 5.53.5
Problem Types
TypeCWE IDDescription
CWECWE-79CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Type: CWE
CWE ID: CWE-79
Description: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Metrics
VersionBase scoreBase severityVector
4.05.3MEDIUM
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
Version: 4.0
Base score: 5.3
Base severity: MEDIUM
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
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/sveltejs/svelte/security/advisories/GHSA-qgvg-pr8v-6rr3
x_refsource_CONFIRM
https://github.com/sveltejs/svelte/commit/0298e979371bb583855c9810db79a70a551d22b9
x_refsource_MISC
https://github.com/sveltejs/svelte/releases/tag/svelte%405.53.5
x_refsource_MISC
Hyperlink: https://github.com/sveltejs/svelte/security/advisories/GHSA-qgvg-pr8v-6rr3
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/sveltejs/svelte/commit/0298e979371bb583855c9810db79a70a551d22b9
Resource:
x_refsource_MISC
Hyperlink: https://github.com/sveltejs/svelte/releases/tag/svelte%405.53.5
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found