What’s Vulnerable › Vulnerabilities

CVE-2024-3863

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-04-16 · updated 2026-06-17
• Weakness: CWE-434

Description

The executable file warning was not presented when downloading .xrm-ms files. *Note: This issue only affected Windows operating systems. Other operating systems are unaffected.* This vulnerability affects Firefox < 125, Firefox ESR < 115.10, and Thunderbird < 115.10.

Affected products

• Mozilla Firefox: before 115.10.0; before 125.0 — fixed in 115.10.0, 125.0
• Mozilla Thunderbird: before 115.10 — fixed in 115.10

How to fix

Upgrade to a fixed version: Mozilla Firefox 115.10.0, 125.0; Mozilla Thunderbird 115.10. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1885855
• https://www.mozilla.org/security/advisories/mfsa2024-18/
• https://www.mozilla.org/security/advisories/mfsa2024-19/
• https://www.mozilla.org/security/advisories/mfsa2024-20/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1885855
• https://www.mozilla.org/security/advisories/mfsa2024-18/
• https://www.mozilla.org/security/advisories/mfsa2024-19/
• https://www.mozilla.org/security/advisories/mfsa2024-20/

Get alerted when CVE-2024-3863 or the next vulnerability affects your stack