CVE-2023-37207: Debian Linux

Medium severity, CVSS 6.5. EPSS: 0.7% chance of exploitation in the next 30 days.

A website could have obscured the fullscreen notification by using a URL with a scheme handled by an external program, such as a mailto URL. This could have led to user confusion and possible spoofing attacks. This vulnerability affects Firefox < 115, Firefox ESR < 102.13, and Thunderbird < 102.13.

Affected products

• Debian Debian Linux: version 10.0 only; version 11.0 only; version 12.0 only
• Mozilla Firefox: before 115.0 (fixed in 115.0)
• Mozilla Firefox ESR: before 102.13 (fixed in 102.13)
• Mozilla Thunderbird: before 102.13 (fixed in 102.13)

Published 2023-07-05. Last modified 2026-06-17.