CVE-2026-44098 Overview
CVE-2026-44098 is an OS command injection vulnerability [CWE-78] affecting a charging station component that communicates with an Open Charge Point Protocol (OCPP) backend. An unauthenticated remote attacker who bypasses the firewall and gains control over the OCPP backend can inject arbitrary operating system commands. Commands execute in the context of the limited local user charx-oa. Successful exploitation can interrupt charging operations and provide a foothold on the device.
Critical Impact
Unauthenticated attackers controlling the OCPP backend can execute arbitrary OS commands as charx-oa, disrupting charging services and enabling further post-exploitation activity on the charging station.
Affected Products
- Charging station firmware exposing an OCPP client interface (see CERTVDE Advisory VDE-2026-008)
- Deployments where the OCPP backend is reachable through a bypassed or misconfigured firewall
- Systems running the charx-oa service account
Discovery Timeline
- 2026-07-30 - CVE-2026-44098 published to the National Vulnerability Database (NVD)
- 2026-07-30 - Last updated in NVD database
Technical Details for CVE-2026-44098
Vulnerability Analysis
The vulnerability is an OS command injection flaw classified under [CWE-78]. The affected charging station parses messages received from the OCPP backend and passes attacker-controlled fields into a shell context without adequate sanitization. Any actor who can reach the OCPP client channel, including one who bypasses network firewall controls, can craft OCPP messages that append or substitute shell metacharacters. The injected commands execute under the charx-oa limited user account. While charx-oa is not root, the attacker gains code execution suitable for reconnaissance, lateral movement, persistence, and interruption of the charging workflow.
Root Cause
The root cause is missing input validation and unsafe construction of shell command strings from OCPP message fields. Fields supplied by the backend are concatenated into commands passed to a shell interpreter rather than executed through parameterized APIs. This design choice trusts the OCPP backend as an authenticated peer, but the trust boundary collapses when the backend or its network path is attacker-controlled.
Attack Vector
Exploitation requires network reach to the OCPP client interface of the charging station. The advisory notes that a firewall bypass enables an unauthenticated remote attacker to impersonate or take control of the OCPP backend. Once positioned, the attacker sends OCPP payloads containing shell metacharacters in fields that are downstream concatenated into an OS command. The interpreter then executes attacker commands as charx-oa. Refer to the CERTVDE Advisory VDE-2026-008 for message-level technical details.
No verified proof-of-concept code is publicly available for CVE-2026-44098.
See CERTVDE Advisory VDE-2026-008 for vendor-provided technical detail.
Detection Methods for CVE-2026-44098
Indicators of Compromise
- Unexpected child processes spawned by the OCPP client service running under charx-oa.
- Outbound network connections initiated by charx-oa to hosts unrelated to the legitimate OCPP backend.
- Shell metacharacters (;, |, &, backticks, $(...)) observed in OCPP message fields during traffic capture.
- OCPP sessions originating from IP addresses or TLS certificates that do not match the operator's known backend.
Detection Strategies
- Baseline the normal process tree of the OCPP client and alert on deviations, especially execution of sh, bash, wget, curl, nc, or python as charx-oa.
- Inspect OCPP JSON payloads for shell metacharacters and abnormally long string fields before they reach the parser.
- Correlate firewall log anomalies with new inbound OCPP sessions to identify potential firewall-bypass activity.
Monitoring Recommendations
- Forward charging station audit logs and process telemetry to a central SIEM for retention and correlation.
- Monitor authentication and TLS session metadata on the OCPP channel for unexpected client certificates or endpoint changes.
- Alert on any interruption of active charging sessions that coincides with new OCPP command traffic.
How to Mitigate CVE-2026-44098
Immediate Actions Required
- Apply the vendor firmware update referenced in CERTVDE Advisory VDE-2026-008 as soon as it is available for your model.
- Restrict network exposure of the OCPP client interface to known, authenticated backend endpoints only.
- Audit firewall rules and NAT configurations for gaps that could permit backend impersonation.
Patch Information
Refer to CERTVDE Advisory VDE-2026-008 for the authoritative list of fixed firmware versions and vendor guidance. No additional vendor patch URLs were provided in the NVD record at publication.
Workarounds
- Enforce mutual TLS (mTLS) between charging stations and the OCPP backend to prevent backend impersonation.
- Place the OCPP backend and charging stations on a segmented network with strict egress and ingress filtering.
- Disable or firewall the OCPP client interface on stations that do not require backend connectivity until firmware is updated.
# Example: restrict outbound OCPP client traffic to a single authorized backend
# Replace 203.0.113.10 with your operator's OCPP backend IP
iptables -A OUTPUT -p tcp --dport 443 -d 203.0.113.10 -j ACCEPT
iptables -A OUTPUT -p tcp --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
