CVE-2023-49293Public exploitNetwork attack vector

Cross-site scripting via unescaped HTML proxy URL

Published Dec 4, 2023 · Updated May 29, 2025

Cross-site scripting in Vite 4.4.0 through 4.4.11, 4.5.0, and 5.0.0 through 5.0.4 allows remote attackers to inject HTML. server.transformIndexHtml incorporates an unmodified request URL into a generated html-proxy script source, letting query delimiters close the tag and add attacker-controlled markup. Exploitation requires appType custom, default HTML middleware, an inline module script, and a user who opens the malicious URL; restricted files remain inaccessible.

CVSS severity6.1
Medium
EPSS probability1.00%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Vite 4.4.0 through 4.4.11, 4.5.0, and 5.0.0 through 5.0.4 allows remote attackers to inject HTML. server.transformIndexHtml incorporates an unmodified request URL into a generated html-proxy script source, letting query delimiters close the tag and add attacker-controlled markup. Exploitation requires appType custom, default HTML middleware, an inline module script, and a user who opens the malicious URL; restricted files remain inaccessible.

The record

CVE
CVE-2023-49293
Published
Dec 4, 2023
Updated
May 29, 2025
Vendor
Vite
Product
Vite
Classifications
CWE-80, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 4, 2023CVE publishedPublication date reported by the CVE source.
  2. May 29, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=>=4.4.0, < 4.4.12
  2. Affected versionversion== 4.5.0
  3. Affected versionversion=>=5.0.0, < 5.0.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Vite · Viteversion=>=4.4.0, < 4.4.12; version== 4.5.0; version=>=5.0.0, < 5.0.5

Published CVSS scores

6.1GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

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

Technologies

Your stack

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Your stack

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