What’s Vulnerable › Vulnerabilities

CVE-2023-5726

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-10-25 · updated 2026-06-17

Description

A website could have obscured the full screen notification by using the file open dialog. This could have led to user confusion and possible spoofing attacks. *Note: This issue only affected macOS operating systems. Other operating systems are unaffected.* This vulnerability affects Firefox < 119, Firefox ESR < 115.4, and Thunderbird < 115.4.1.

Affected products

• Mozilla Firefox: before 119.0 — fixed in 119.0
• Mozilla Firefox ESR: before 115.4 — fixed in 115.4
• Mozilla Thunderbird: before 115.4.1 — fixed in 115.4.1

How to fix

Upgrade to a fixed version: Mozilla Firefox 119.0; Mozilla Firefox ESR 115.4; Mozilla Thunderbird 115.4.1. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1846205
• https://www.mozilla.org/security/advisories/mfsa2023-45/
• https://www.mozilla.org/security/advisories/mfsa2023-46/
• https://www.mozilla.org/security/advisories/mfsa2023-47/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1846205
• https://www.mozilla.org/security/advisories/mfsa2023-45/
• https://www.mozilla.org/security/advisories/mfsa2023-46/
• https://www.mozilla.org/security/advisories/mfsa2023-47/

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