CVE-2024-8386

Severity: medium (CVSS 6.1 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: 2024-09-03 · updated 2026-06-17
Weakness: CWE-601

Description

If a site had been granted the permission to open popup windows, it could cause Select elements to appear on top of another site to perform a spoofing attack. This vulnerability affects Firefox < 130, Firefox ESR < 128.2, and Thunderbird < 128.2.

Affected products

Mozilla Firefox: before 130.0 — fixed in 130.0
Mozilla Firefox ESR: before 128.2 — fixed in 128.2

How to fix

Upgrade to a fixed version: Mozilla Firefox 130.0; Mozilla Firefox ESR 128.2. Check the vendor advisory for mitigations.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1907032
https://bugzilla.mozilla.org/show_bug.cgi?id=1909163
https://bugzilla.mozilla.org/show_bug.cgi?id=1909529
https://www.mozilla.org/security/advisories/mfsa2024-39/
https://www.mozilla.org/security/advisories/mfsa2024-40/
https://www.mozilla.org/security/advisories/mfsa2024-43/

Get alerted when CVE-2024-8386 or the next vulnerability affects your stack