CVE-2023-5721: Debian Linux

Medium severity, CVSS 4.3. EPSS: 0.8% chance of exploitation in the next 30 days.

It was possible for certain browser prompts and dialogs to be activated or dismissed unintentionally by the user due to an insufficient activation-delay. This vulnerability affects Firefox < 119, Firefox ESR < 115.4, and Thunderbird < 115.4.1.

Affected products

• Debian Debian Linux: version 10.0 only; version 11.0 only
• 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)

Published 2023-10-25. Last modified 2026-06-17.