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Vulnerabilities

Vulnerability · CVE-2026-27901

Svelte performance oriented web framework.

Published Feb 26, 2026 · catalog updated Jun 17, 2026 · Svelte performance oriented web

Check if you run it

No confirmed exploitation is on record for CVE-2026-27901. EPSS is 0.40%. Act only if a listed version of Svelte performance oriented web is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Svelte performance oriented web).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.40%
Remediation
Advisory link
Affected products
cpe svelte/svelte

Svelte performance oriented web framework. Prior to version 5.53.5, the contents of and on elements were not properly escaped. This could enable HTML injection and Cross-Site Scripting (XSS) if rendering untrusted data as the binding's initial value on the server. Version 5.53.5 fixes the issue.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe svelte/svelte5.53.5

How to fix CVE-2026-27901

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-27901. EPSS is 0.40%. Act only if a listed version of Svelte performance oriented web is installed.

Which versions are affected?

Compare what you have installed with 5.53.5. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS). EPSS 0.40%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 26, 2026 · NIST NVD

    Detected

    Svelte performance oriented web framework. Prior to version 5.53.5, the contents of and on elements were not properly escaped. This could enable HTML injection and Cross-Site Scripting (XSS) if rendering untrusted data as the binding's initial value on the server. Version 5.53.5 fixes the issue.

  2. Jun 17, 2026 · NIST NVD

    Updated

    Svelte performance oriented web framework. Prior to version 5.53.5, the contents of and on elements were not properly escaped. This could enable HTML injection and Cross-Site Scripting (XSS) if rendering untrusted data as the binding's initial value on the server. Version 5.53.5 fixes the issue.

Sources

  • CVE.orgVulnerability recordCVE-2026-27901

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-27901

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-2026-27901

    Svelte performance oriented web framework. Prior to version 5.53.5, the contents of and on elements were not properly escaped. This could enable HTML injection and Cross-Site Scripting (XSS) if rendering untrusted data as the

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.