What’s Vulnerable › Vulnerabilities

CVE-2024-7525

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% 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-276

Description

It was possible for a web extension with minimal permissions to create a `StreamFilter` which could be used to read and modify the response body of requests on any site. This vulnerability affects Firefox < 129, Firefox ESR < 115.14, Firefox ESR < 128.1, Thunderbird < 128.1, and Thunderbird < 115.14.

Affected products

• Mozilla Firefox: before 129.0 — fixed in 129.0
• Mozilla Firefox ESR: before 115.14.0; 128.0 — fixed in 115.14.0
• Mozilla Thunderbird: before 115.14.0; 128.0.1 — fixed in 115.14.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 129.0; Mozilla Firefox ESR 115.14.0; Mozilla Thunderbird 115.14.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1909298
• https://www.mozilla.org/security/advisories/mfsa2024-33/
• https://www.mozilla.org/security/advisories/mfsa2024-34/
• https://www.mozilla.org/security/advisories/mfsa2024-35/
• https://www.mozilla.org/security/advisories/mfsa2024-37/
• https://www.mozilla.org/security/advisories/mfsa2024-38/

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