CVE-2024-21504Network attack vector

Cross-site scripting via query-string prototype pollution

Published Mar 19, 2024 · Updated Aug 27, 2024

Cross-site scripting in Livewire 3.3.5 through 3.4.8 allows remote attackers to execute JavaScript through a crafted link. The history plugin's fromQueryString function builds a normal JavaScript object from attacker-controlled query keys, allowing proto assignments to alter inherited HTML state. A page must bind a property with #[Url], and a victim must open the link; injected code then runs in that victim's browser session.

CVSS severity6.1
Medium
EPSS probability0.52%
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 Livewire 3.3.5 through 3.4.8 allows remote attackers to execute JavaScript through a crafted link. The history plugin's fromQueryString function builds a normal JavaScript object from attacker-controlled query keys, allowing proto assignments to alter inherited HTML state. A page must bind a property with #[Url], and a victim must open the link; injected code then runs in that victim's browser session.

The record

CVE
CVE-2024-21504
Published
Mar 19, 2024
Updated
Aug 27, 2024
Vendor
Livewire
Product
Livewire
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 19, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2024Record 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=3.3.5 <3.4.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Livewire · Livewireversion=3.3.5 <3.4.9

Published CVSS scores

6.1GitHub Advisory DatabaseCVSS: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 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 exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

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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