CVE-2025-32388Public exploitNetwork attack vector

Cross-site scripting via unescaped tracked parameters

Published Apr 15, 2025 · Updated Apr 16, 2025

Cross-site scripting in SvelteKit 2.0.0 through 2.20.5 allows remote attackers to execute script via a crafted search parameter name. The stringify_uses function inserts tracked search parameter names into the server-rendered boot script without HTML-safe serialization, allowing a closing script tag to inject attacker-controlled JavaScript. Exploitation requires a server load function that iterates event.url.searchParams and a user who follows the crafted link; successful exploitation runs script in that site's browser context.

CVSS severity5.4
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Cross-site scripting in SvelteKit 2.0.0 through 2.20.5 allows remote attackers to execute script via a crafted search parameter name. The stringify_uses function inserts tracked search parameter names into the server-rendered boot script without HTML-safe serialization, allowing a closing script tag to inject attacker-controlled JavaScript. Exploitation requires a server load function that iterates event.url.searchParams and a user who follows the crafted link; successful exploitation runs script in that site's browser context.

The record

CVE
CVE-2025-32388
Published
Apr 15, 2025
Updated
Apr 16, 2025
Vendor
Svelte
Product
SvelteKit
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 16, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 2.0.0, < 2.20.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Svelte · SvelteKitversion=>= 2.0.0, < 2.20.6

Published CVSS scores

5.4GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001Malicious Link

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo