What’s Vulnerable › Vulnerabilities

CVE-2024-4769

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-05-14 · updated 2026-06-17
• Weakness: CWE-351

Description

When importing resources using Web Workers, error messages would distinguish the difference between `application/javascript` responses and non-script responses. This could have been abused to learn information cross-origin. This vulnerability affects Firefox < 126, Firefox ESR < 115.11, and Thunderbird < 115.11.

Affected products

• Debian Linux: 10.0
• Mozilla Firefox: before 115.11.0; before 126.0 — fixed in 115.11.0, 126.0
• Mozilla Thunderbird: before 115.11.0 — fixed in 115.11.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 115.11.0, 126.0; Mozilla Thunderbird 115.11.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1886108
• https://lists.debian.org/debian-lts-announce/2024/05/msg00010.html
• https://lists.debian.org/debian-lts-announce/2024/05/msg00012.html
• https://www.mozilla.org/security/advisories/mfsa2024-21/
• https://www.mozilla.org/security/advisories/mfsa2024-22/
• https://www.mozilla.org/security/advisories/mfsa2024-23/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1886108
• https://lists.debian.org/debian-lts-announce/2024/05/msg00010.html
• https://lists.debian.org/debian-lts-announce/2024/05/msg00012.html
• https://www.mozilla.org/security/advisories/mfsa2024-21/
• https://www.mozilla.org/security/advisories/mfsa2024-22/
• https://www.mozilla.org/security/advisories/mfsa2024-23/

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