CVE-2026-108161 fusionpbx CVE debrief

Who should care

Defenders responsible for FusionPBX installations, especially those with publicly accessible recording download features, should assess exposure and prioritize patching or mitigation efforts.

Why it matters

Defenders should prioritize verifying exposure of FusionPBX installations and apply patches or mitigations as available due to the potential for command execution and lateral movement.

• Potential command execution as the web server user
• Possible lateral movement within the network
• Potential data tampering or unauthorized access
• Need for verification of exposure and patching

Technical summary

The vulnerability exists in the call_recordings::download() function of FusionPBX through 5.6.5. An unauthenticated attacker can exploit this vulnerability by placing calls with malicious caller ID values, potentially leading to command execution as the web server user. The vulnerability allows attackers to embed shell metacharacters in the Caller-ID name or number, which can be executed when a privileged user downloads multiple recordings as a ZIP. Defenders should prioritize verifying exposure of FusionPBX installations, especially those with publicly accessible recording download features, and apply patches or mitigations as available.

Defensive priority

Defenders should prioritize verifying exposure of FusionPBX installations, especially those with publicly accessible recording download features, and apply patches or mitigations as available.

Recommended defensive actions

• Verify exposure of FusionPBX installations, especially those with publicly accessible recording download features
• Apply patches or mitigations as available
• Monitor for suspicious caller ID values and recording download activity
• Consider implementing additional security controls, such as input validation and web application firewalls
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide details on the OS command injection vulnerability in FusionPBX through 5.6.5. The vulnerability allows unauthenticated attackers to execute commands by placing calls with malicious caller ID values.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.