CVE-2026-100232

Executive Summary

CVE-2026-100232 is a post-authentication OS command injection vulnerability (CWE-78) in SonicWall Network Security Manager (NSM) on-premises deployments. An attacker who already possesses valid authenticated credentials with elevated privileges can, under specific conditions, inject and execute arbitrary operating system commands on the underlying NSM host, leading to remote code execution. Impact is high for confidentiality, integrity, and availability of the NSM appliance and any data or network segments it manages, though exploitation requires prior privileged authentication, reducing the attack's reachability.

Technical Analysis

The vulnerability is classified under CWE-78, Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). This class of defect arises when application-controlled input is passed to a system shell or command interpreter without adequate sanitization, allowing an attacker to append, chain, or substitute commands executed by the host operating system.

Per the CVE record, the flaw is:

• Post-authentication — exploitation requires a valid, authenticated session. The CVSS vector confirms this via PR:H (Privileges Required: High), meaning the attacker must hold administrative or otherwise highly privileged access to the NSM interface.
• Conditional — the NVD description states exploitation is possible "in specific conditions," implying that not every deployment or configuration may be exploitable, and that the vulnerable code path depends on the state of the application (for example, specific operations, features, or input fields being reachable).
• Remote — the vector AV:N (Attack Vector: Network) indicates the vulnerable interface is reachable over the network, consistent with an NSM web management/API surface.

The exact vulnerable component — such as the specific request parameter, API endpoint, or feature of the NSM console that accepts the unsanitized input — is not disclosed in the available data. No function names, parameter names, file paths, or endpoint identifiers are provided in the NVD Description or CNA Title, and none are fabricated here. At the vulnerability-class level, the attack surface is the authenticated NSM management interface through which a privileged user supplies input that the application forwards to a shell.

CVSS subscores indicate:

• Confidentiality (C:H) — full read access to host data, potentially including credentials, configuration, and managed-device data.
• Integrity (I:H) — full ability to modify files, configuration, and potentially downstream managed security policies.
• Availability (A:H) — full ability to disrupt or destroy NSM services.
• Scope (S:U) — the impact is confined to the security authority of the vulnerable component (the NSM host/application), not beyond.

Because the injection executes as the NSM service account on the host OS, the effective privilege of the injected commands is bounded by that account's permissions — commonly root or a highly privileged service user on appliance-style deployments.

Exploitation Scenarios

No public proof-of-concept, Nuclei template, or exploit code is available for CVE-2026-100232. The attack chain below is inferred strictly from the vulnerability class (CWE-78, post-authentication command injection) and the CVSS vector. No specific function names, endpoints, or parameters are asserted, because none are disclosed in the source data.

1. Reconnaissance / Target Identification. An adversary identifies an internet- or intranet-exposed SonicWall NSM on-premises instance. Network reachability is confirmed (AV:N). The attacker must already hold valid NSM credentials with high privileges (PR:H) — for example, obtained through credential theft, prior compromise, a separate vulnerability, or a malicious/compromised insider. There is no authentication bypass in this CVE; authentication is a precondition.

2. Triggering the Flaw. Once authenticated with sufficient privilege, the attacker interacts with the specific NSM feature or input path that forwards user-supplied input into an OS command. The NVD description specifies that this occurs "in specific conditions," meaning the attacker may need to reach a particular application state or feature that invokes the underlying OS command. Because the vulnerable parameter is not publicly documented, the precise trigger is unknown; at the class level, it involves supplying shell metacharacters or command fragments into input that the application fails to neutralize before passing to the OS.

3. Payload / Execution (vulnerability-class level). Consistent with OS command injection, the injected content is executed by the host's command interpreter in the context of the NSM service account. Successful injection produces arbitrary OS command execution — the essence of the RCE impact (C:H/I:H/A:H). No specific payload syntax is asserted here, as it would depend on the undisclosed vulnerable input and interpreter.

4. Post-Exploitation Impact. With code execution as the NSM service account, an attacker can read sensitive configuration and credential material (C:H), alter application/host files and potentially management configuration (I:H), and terminate or corrupt NSM processes/services (A:H). Depending on the service account's privileges, this may extend to full host compromise and serve as a pivot into the network segments NSM administers. Whether active exploitation has occurred in the wild is not evidenced by the available data; CISA KEV does not list this CVE, and EPSS is low (0.00537, ~44th percentile).

Impact Assessment

Successful exploitation yields remote code execution on the NSM on-premises host under the NSM service account. Business impact centers on the NSM platform itself, which is a centralized management console for SonicWall security infrastructure — compromise of the console can translate into compromise of the policies, credentials, and managed devices it governs.

• Confidentiality — High (C:H). Read access to host data, configuration, and potentially sensitive operational/credential material managed by NSM.
• Integrity — High (I:H). Ability to modify files and configuration, with potential downstream effects on managed security posture.
• Availability — High (A:H). Ability to disrupt or destroy NSM services, impairing centralized security management.
• Scope — Unchanged (S:U). Impact is bounded to the vulnerable component's security authority.

Blast radius: The directly affected asset is the NSM on-premises instance and its host. Because NSM aggregates management of SonicWall devices, a compromised console may provide a pivot to managed infrastructure, credential stores, and monitored network segments. The requirement for high privileges (PR:H) and the "specific conditions" caveat materially reduce exposure compared to an unauthenticated flaw, but for a management-plane product this severity remains significant.

Exploitability signal: EPSS ≈ 0.00537 (~44th percentile) is low, indicating limited predicted near-term exploitation activity. No public PoC/exploit, no Nuclei template, and no CISA KEV listing. No known threat-actor campaign or in-the-wild exploitation is evidenced in the available data.

Detection Guidance

Detection strategy: because this is a post-authentication command injection, monitor (a) authenticated NSM management sessions for anomalous command-execution behavior on the host, and (b) NSM host processes for unexpected child processes spawned from the NSM application/service context. The rules below are generic to OS command injection and should be tuned to the actual NSM request paths and service account, which are not publicly documented.

Sigma Rule

title: Possible OS Command Injection via SonicWall NSM Management Interface
id: 5f7a1c2e-9b3d-4a6f-8e21-0c4d7b9a1e33
status: experimental
description: Detects suspicious shell metacharacter patterns in NSM management requests that may indicate post-authentication OS command injection (CWE-78, CVE-2026-100232).
references:
  - https://nvd.nist.gov/vuln/detail/CVE-2026-100232
author: Threat Intelligence
date: 2026/01/01
logsource:
  category: webserver
  product: sonicwall
detection:
  selection_method:
    cs-method:
      - POST
      - GET
  selection_pattern:
    cs-uri-query|contains:
      - ';'
      - '|'
      - '`'
      - '$(('
      - '&&'
      - '||'
      - '%0a'
  filter_benign:
    cs-uri-query|contains:
      - '&'
  condition: selection_method and selection_pattern and not filter_benign
fields:
  - c-ip
  - cs-uri
  - cs-uri-query
  - sc-status
falsepositives:
  - Legitimate applications passing encoded separators in benign query parameters
level: medium
tags:
  - attack.t1059
  - attack.execution
  - cve.2026-100232

YARA Rule

rule CVE_2026_100232_NSM_CMD_INJECTION
{
    meta:
        description = "Detects common OS command-injection metacharacter payloads in captured NSM management requests (CWE-78, CVE-2026-100232)"
        author = "Threat Intelligence"
        date = "2026-01-01"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-100232"
        severity = "medium"

    strings:
        $m1 = ";" ascii wide
        $m2 = "&&" ascii wide
        $m3 = "||" ascii wide
        $m4 = "|" ascii wide
        $m5 = "`" ascii wide
        $m6 = "$(" ascii wide
        $cmd1 = "/bin/sh" ascii wide nocase
        $cmd2 = "/bin/bash" ascii wide nocase
        $cmd3 = "cmd.exe" ascii wide nocase
        $cmd4 = "powershell" ascii wide nocase

    condition:
        uint16(0) == 0x0d0a or filesize < 5MB
        and 1 of ($cmd1, $cmd2, $cmd3, $cmd4)
        and 2 of ($m*)
}

Suricata IDS Rule

alert http any any -> any any (msg:"CVE-2026-100232 Possible SonicWall NSM OS Command Injection Attempt"; flow:established,to_server; http.method; content:"POST"; http.uri; pcre:"/(\;|\||\`|\$\(|\&\&|\|\|)/Ui"; http.header; content:"Cookie"; nocase; classtype:web-application-attack; reference:cve,2026-100232; reference:url,nvd.nist.gov/vuln/detail/CVE-2026-100232; sid:2026100232; rev:1;)

Elastic Detection

sequence by source.ip with maxspan=2m
  [ network where network.protocol == "http" and http.request.method in ("POST", "GET")
      and http.request.uri like~ "*;*" ]
  [ process where event.type == "start"
      and process.parent.name != null
      and process.name in ("sh", "bash", "cmd.exe", "powershell.exe", "curl", "wget", "wget.exe", "certutil.exe") ]

Splunk SPL Query

index=web OR index=proxy sourcetype=access_combined OR sourcetype=sonicwall:nsm
| where (match(url, "(%3B|%7C|%60|%24%28|\;|\||\`|\$\(|\&\&)") OR match(uri_path, "(\;|\||\`|\$\(|\&\&)"))
| eval indicator=coalesce(cs_uri, url, uri_path), client=coalesce(c_ip, clientip, src)
| stats count min(_time) as first_seen max(_time) as last_seen values(indicator) as payloads by client, status
| where count >= 1
| convert ctime(first_seen) ctime(last_seen)
| sort - count

Wazuh OSSEC Rule

<group name="sonicwall_nsm,web,attack,">
  <rule id="100232" level="10">
    <if_sid>31100</if_sid>
    <id>^40[0-9]$</id>
    <description>CVE-2026-100232: Possible OS command injection attempt against SonicWall NSM (shell metacharacters in request)</description>
    <regex type="pcre2">(?i)(;|\||`|\$\(|&&|\|\|)</regex>
    <options>no_full_log</options>
    <mitre>
      <id>T1059</id>
    </mitre>
    <group>cve_2026_100232,</group>
  </rule>
</group>

Mitigation & Patch Guidance

Patch confidence: 0/4 (UNPATCHED — no patch evidence from any tracked source). No vendor fix version or affected version range has been published in the available data. Because the flaw is post-authentication and requires high privileges, exposure is primarily an insider/compromised-credential concern, but the management-plane nature of NSM warrants prompt action.

1) Immediate mitigations (in the absence of a patch):

• Restrict network access to the NSM on-premises management interface to trusted administrative networks only (VPN, jump host, management VLAN). Do not expose NSM directly to the internet.
• Enforce least privilege: limit the number of accounts with high-privilege NSM access; review and remove unnecessary admin accounts.
• Enable and centralize authentication/authorization logging and audit admin sessions for anomalous command-execution indicators.
• Apply network detections (Suricata/Sigma/Elastic/Splunk rules above) to the NSM request path.
• Monitor the NSM host for unexpected child processes spawned from the NSM service account.
• Enforce strong, unique credentials and MFA (if supported) on NSM admin accounts to reduce the likelihood of the prerequisite credential compromise.

2) Patch / upgrade steps:

• There is no confirmed patch reference in the tracked sources. Monitor the SonicWall PSIRT/advisory portal and the NVD entry for CVE-2026-100232 for an official fixed version and apply it as soon as it is released.
• Once a vendor fix version is published, validate it against the affected version range (currently unknown) and follow the vendor upgrade procedure for NSM on-premises.

3) Long-term hardening:

• Segment management-plane systems from production/data networks; treat NSM as a tier-0 asset.
• Adopt a vulnerability management process that tracks management-plane CVEs and PSA advisories (SonicWall PSIRT) with defined SLAs.
• Continuously audit service-account privileges; run the NSM application under the minimum required OS privileges.
• Implement input-validation review and secure coding (CWE-78 prevention: avoid shell invocation, use parameterized/exec APIs, allow-list input) as part of vendor/product hardening expectations — though remediation of this defect ultimately belongs to the vendor.

References

• NVD — CVE-2026-100232: https://nvd.nist.gov/vuln/detail/CVE-2026-100232
• SonicWall Product Security (PSIRT) advisory portal: https://psirt.global.sonicwall.com/
• MITRE ATT&CK — T1059 Command and Scripting Interpreter: https://attack.mitre.org/techniques/T1059/
• CWE-78 — Improper Neutralization of Special Elements used in an OS Command: https://cwe.mitre.org/data/definitions/78.html
• CISA Known Exploited Vulnerabilities Catalog (CVE not listed as of this report): https://www.cisa.gov/known-exploited-vulnerabilities-catalog

No public proof-of-concept, Nuclei template, or exploit code is available. No threat-actor campaign or exploit-in-the-wild evidence is associated with CVE-2026-100232 in the available data; the CVE is not listed in CISA KEV, and EPSS is low (~0.00537, ~44th percentile).