CVE-2026-111219 Netgate CVE debrief

Who should care

System administrators and security teams responsible for pfSense CE installations, especially those with exposed PPPoE Server Edit interfaces or untrusted users with PPPoE Server Edit privileges, should assess their exposure and prioritize patching or mitigation.

Why it matters

CVE-2026-111219 is a high-severity vulnerability in Netgate pfSense CE that allows command injection via unvalidated username POST fields. Defenders should prioritize patching or mitigating this vulnerability, especially in environments where PPPoE Server Edit privileges are exposed to untrusted users.

• Potential command injection as root during PPPoE client authentication
• Elevation of privileges for attackers with PPPoE Server Edit access
• Possible disruption of network operations if exploited

Technical summary

The vulnerability exists in services_pppoe_edit.php, where unvalidated username POST fields allow injection of mpd.secret entries. Attackers with PPPoE Server Edit privileges can add a line starting with '!', causing mpd5 to run commands as root during PPPoE client authentication. This issue affects Netgate pfSense CE through version 2.9.0, with a CVSS score of 7.5 and high severity. Defenders should prioritize patching or mitigating this vulnerability, especially in environments where PPPoE Server Edit privileges are exposed to untrusted users, to prevent potential command injection as root during PPPoE client authentication and elevation of privileges for attackers.

Defensive priority

Defenders should prioritize patching or mitigating this vulnerability, especially in environments where PPPoE Server Edit privileges are exposed to untrusted users.

Recommended defensive actions

• Patch pfSense CE to a version beyond 2.9.0 if possible
• Restrict PPPoE Server Edit privileges to trusted users
• Monitor for suspicious activity related to PPPoE authentication
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• 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 vulnerability is confirmed in Netgate pfSense CE through version 2.9.0. The CVE record and NVD entry provide details on the vulnerability, but additional information from source references is needed for a comprehensive understanding.

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.