CVE-2023-5732: Debian Linux

Medium severity, CVSS 6.5. EPSS: 1% chance of exploitation in the next 30 days.

An attacker could have created a malicious link using bidirectional characters to spoof the location in the address bar when visited. This vulnerability affects Firefox < 117, 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 117.0 (fixed in 117.0)
• Mozilla Firefox ESR: before 115.4.1 (fixed in 115.4.1)
• Mozilla Thunderbird: before 115.4.1 (fixed in 115.4.1)

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