What’s Vulnerable › Vulnerabilities

CVE-2024-7524

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-08-06 · updated 2026-06-17
• Weakness: CWE-79

Description

Firefox adds web-compatibility shims in place of some tracking scripts blocked by Enhanced Tracking Protection. On a site protected by Content Security Policy in "strict-dynamic" mode, an attacker able to inject an HTML element could have used a DOM Clobbering attack on some of the shims and achieved XSS, bypassing the CSP strict-dynamic protection. This vulnerability affects Firefox < 129, Firefox ESR < 115.14, and Firefox ESR < 128.1.

Affected products

• Mozilla Firefox: before 129.0 — fixed in 129.0
• Mozilla Firefox ESR: before 115.14; from 116.0 before 128.1 — fixed in 115.14, 128.1

How to fix

Upgrade to a fixed version: Mozilla Firefox 129.0; Mozilla Firefox ESR 115.14, 128.1. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1909241
• https://www.mozilla.org/security/advisories/mfsa2024-33/
• https://www.mozilla.org/security/advisories/mfsa2024-34/
• https://www.mozilla.org/security/advisories/mfsa2024-35/

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