CVE-2024-7524Network attack vector

Cross-site scripting via DOM-clobbered compatibility shims

Published Aug 6, 2024 · Updated Mar 25, 2025

XSS in Mozilla Firefox before 129 and Firefox ESR before 115.14 or 128.1 allows remote attackers to run script in a site's origin. Enhanced Tracking Protection substitutes web-compatibility shims for blocked tracking scripts, and injected HTML can DOM-clobber values consumed by those shims, bypassing strict-dynamic CSP. Reachability requires a site that uses strict-dynamic CSP, activates an affected shim, and permits attacker-controlled HTML; the result is script execution in that site's origin.

CVSS severity6.1
Medium
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

XSS in Mozilla Firefox before 129 and Firefox ESR before 115.14 or 128.1 allows remote attackers to run script in a site's origin. Enhanced Tracking Protection substitutes web-compatibility shims for blocked tracking scripts, and injected HTML can DOM-clobber values consumed by those shims, bypassing strict-dynamic CSP. Reachability requires a site that uses strict-dynamic CSP, activates an affected shim, and permits attacker-controlled HTML; the result is script execution in that site's origin.

The record

CVE
CVE-2024-7524
Published
Aug 6, 2024
Updated
Mar 25, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 6, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 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=unspecified <129

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <129
Mozilla · Firefox ESRversion=unspecified <115.14; version=unspecified <128.1

Published CVSS scores

6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1NIST NVDCVSS: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')
T1189Drive-by Compromise

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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