CVE-2023-45239: Facebook Tac Plus

Critical severity, CVSS 9.8. EPSS: 2.2% chance of exploitation in the next 30 days.

A lack of input validation exists in tac_plus prior to commit 4fdf178 which, when pre or post auth commands are enabled, allows an attacker who can control the username, rem-addr, or NAC address sent to tac_plus to inject shell commands and gain remote code execution on the tac_plus server.

Affected products

• Facebook Tac Plus: before 2023-10-05 (fixed in 2023-10-05)
• Fedoraproject Fedora: version 39 only

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