CVE-2026-22103 Overview
CVE-2026-22103 is a command injection vulnerability affecting an NPC start endpoint exposed on a web server listening on TCP port 8090. An unauthenticated remote attacker can send crafted input to the endpoint and execute arbitrary operating system commands on the underlying host. The flaw is classified under [CWE-77] (Improper Neutralization of Special Elements used in a Command).
The issue was disclosed through DIVD Security Advisory #2026-00001 and published to the National Vulnerability Database (NVD) on 2026-07-13.
Critical Impact
An unauthenticated network attacker can execute arbitrary commands on the affected host, resulting in full compromise of confidentiality, integrity, and availability.
Affected Products
- Affected vendor and product not disclosed in the NVD entry at time of publication
- Web server component exposing the NPC start endpoint on TCP port 8090
- Refer to DIVD Security Advisory #2026-00001 for coordinated disclosure updates
Discovery Timeline
- 2026-07-13 - CVE-2026-22103 published to NVD
- 2026-07-13 - Last updated in NVD database
Technical Details for CVE-2026-22103
Vulnerability Analysis
The vulnerability resides in the NPC start endpoint served by a web application bound to TCP port 8090. The endpoint accepts user-supplied input and passes it to an operating system command interpreter without adequate neutralization of shell metacharacters. As a result, attacker-controlled data is interpreted as command syntax rather than data.
Exploitation requires no authentication and no user interaction. The attack is delivered over the network against the exposed HTTP service, which typically runs with elevated privileges to launch NPC processes. Successful exploitation grants the attacker execution of arbitrary commands in the context of the web server process.
Root Cause
The root cause is improper neutralization of special elements used in a command [CWE-77]. Input passed to the NPC start handler is concatenated into a shell command string. Metacharacters such as ;, |, &, backticks, and $() are not stripped or escaped before the command is executed by the underlying interpreter.
Attack Vector
The attack vector is network-based. An attacker sends a crafted HTTP request to the vulnerable NPC start endpoint on port 8090. Injected shell syntax appended to a legitimate parameter is executed by the host operating system. Because the endpoint is unauthenticated, any actor with network reachability to port 8090 can trigger the flaw.
No verified public exploit code is available. Technical specifics are documented in DIVD Security Advisory #2026-00001.
Detection Methods for CVE-2026-22103
Indicators of Compromise
- Unexpected HTTP requests to the NPC start endpoint on TCP port 8090 containing shell metacharacters such as ;, |, &, backticks, or $()
- Child processes such as sh, bash, cmd.exe, powershell.exe, curl, or wget spawned by the web server process handling port 8090
- Outbound connections from the web server host to unfamiliar IP addresses shortly after requests to the NPC start endpoint
- New or modified files in web-writable directories following requests to the vulnerable endpoint
Detection Strategies
- Inspect HTTP access logs for the NPC start URI with query or body parameters containing command separators or URL-encoded shell syntax (%3B, %7C, %26)
- Correlate web server process activity with unexpected process lineage where the web server is the parent of a shell or scripting interpreter
- Alert on inbound traffic to port 8090 from untrusted network segments and on any successful HTTP 200 responses to malformed payloads
Monitoring Recommendations
- Enable verbose HTTP request logging on the service bound to port 8090, including request bodies where feasible
- Forward web server and host process telemetry to a centralized SIEM or data lake for correlation and retention
- Monitor egress traffic from hosts running the affected service for reverse shell patterns and command-and-control beaconing
How to Mitigate CVE-2026-22103
Immediate Actions Required
- Restrict network access to TCP port 8090 using firewall rules, allowing only trusted management networks
- Review web server and host logs for prior exploitation attempts targeting the NPC start endpoint
- Consult DIVD Security Advisory #2026-00001 for vendor-specific remediation guidance and apply any released patches
- Rotate credentials and secrets accessible from the affected host if compromise is suspected
Patch Information
Patch details are not included in the NVD entry at the time of writing. Administrators should follow the coordinated disclosure updates published in DIVD Security Advisory #2026-00001 and apply vendor-supplied fixes when they become available.
Workarounds
- Block or firewall TCP port 8090 from untrusted networks until a patch is applied
- Place the affected service behind an authenticated reverse proxy that rejects requests containing shell metacharacters
- Run the web server process under a least-privilege account to limit the impact of successful command injection
- Disable the NPC start endpoint if it is not required for production operations
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
