Description
This module exploits CVE-2026-20079, an authentication bypass in the web interface of Cisco Secure Firewall Management Center (FMC). It upgrades a boot-created machine session, obtains its session-specific action token, writes a Makeself-compatible shell script, and executes the selected command payload as root.
Exploitation requires the transient csm_processes startup session to still exist. Normal authenticated activity or session cleanup may remove that session, so an affected appliance may not be exploitable at the time of testing. The underlying request sequence and FIFO/netcat payload were tested against Cisco Secure FMC 10.0.1-1.
Module options
To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':
msf > use exploit/linux/http/cisco/fmc_auth_bypass_rcemsf undefined(fmc_auth_bypass_rce) > show actions ...actions...msf undefined(fmc_auth_bypass_rce) > set ACTION < action-name >msf undefined(fmc_auth_bypass_rce) > show options ...show and set options...msf undefined(fmc_auth_bypass_rce) > runPrioritise with Active Threat Intelligence
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