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Known Exploited Vulnerability
8.5
HIGH CVSS 4.0
CVE-2026-106931
EG Secure Solutions SiteGuard Server Edition OS Command Injection Vulnerability - [Actively Exploited]
Overview
Description

SiteGuard Server Edition contains an OS command injection vulnerability, which may allow an attacker to execute arbitrary OS commands with root or SYSTEM privileges on the system running the affected product.

Details
INFO

Published Date :

Oct. 14, 2026, 5:16 a.m.

Last Modified :

Oct. 21, 2026, 3:42 p.m.

Remotely Exploit :

No

Source :

[email protected]
CISA Notification
CISA KEV (Known Exploited Vulnerabilities)

For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.

Description :

EG Secure Solutions SiteGuard Server Edition contains an OS command injection vulnerability which may allow an attacker to execute arbitrary OS commands with root or SYSTEM privileges on the system running the affected product.

Required Action :

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Known Ransomware Campaign Use:

Unknown

Notes :

https://www.eg-secure.co.jp/siteguard/news/alert-202610-1 ; ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-106931

Impact
Affected Products

The following products are affected by CVE-2026-106931 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Freebsd freebsd
1 E-guardian siteguard
: Total Affected Vendor : 2 | Products : 2
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 134c704f-9b21-4f2e-91b3-4a467353bcc0
CVSS 3.0 HIGH ede6fdc4-6654-4307-a26d-3331c018e2ce
CVSS 3.0 HIGH MITRE-CVE
CVSS 3.0 HIGH [email protected]
CVSS 4.0 HIGH ede6fdc4-6654-4307-a26d-3331c018e2ce
CVSS 4.0 HIGH [email protected]
Solution
Apply vendor patches to address OS command injection and prevent unauthorized command execution.
  • Update SiteGuard Server Edition to the latest version.
  • Apply all security patches released by the vendor.
  • Restrict user privileges where possible.
  • Monitor system for suspicious command execution.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-106931.

URL Resource
https://jvn.jp/en/jp/JVN88474777/ Third Party Advisory
https://www.eg-secure.co.jp/siteguard/news/alert-202610-1 Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-106931 US Government Resource
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-106931 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-106931 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-106931 vulnerability anywhere in the article.

  • The Hacker News
CISA Orders Federal Agencies to Patch Exploited Plex2Shell, Siemens, and SiteGuard Flaws

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Tuesday added four vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog, including four vulnerabilities impacting Pl ... Read more

Published Date: Oct 21, 2026 (1 week, 6 days ago)
  • The Hacker News
ThreatsDay: Adobe RCE, DNS Wallet Theft, NVIDIA Container Escape, Self-Healing Backdoor + 23 More

Someone built a tool to steal data, then decided it should scare the victim for fun. Yes, that’s an actual feature. And somehow, it fits right in with this week's security stories.The rest gets intere ... Read more

Published Date: Oct 15, 2026 (2 weeks, 5 days ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-106931 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Oct. 21, 2026

    Action Type Old Value New Value
    Added CPE Configuration OR *cpe:2.3:a:e-guardian:siteguard:*:*:*:*:server:apache:*:* versions from (including) 2.20 up to (excluding) 8.00 *cpe:2.3:a:e-guardian:siteguard:8.00:-:*:*:server:apache:*:* *cpe:2.3:a:e-guardian:siteguard:8.00:update1:*:*:server:apache:*:* *cpe:2.3:a:e-guardian:siteguard:8.00:update2:*:*:server:apache:*:* *cpe:2.3:a:e-guardian:siteguard:8.00:update3:*:*:server:apache:*:*
    Added CPE Configuration AND OR *cpe:2.3:a:e-guardian:siteguard:*:*:*:*:server:apache:*:* versions from (including) 2.20 up to (excluding) 7.00 *cpe:2.3:a:e-guardian:siteguard:7.00:-:*:*:server:apache:*:* *cpe:2.3:a:e-guardian:siteguard:7.00:update1:*:*:server:apache:*:* *cpe:2.3:a:e-guardian:siteguard:7.00:update2:*:*:server:apache:*:* *cpe:2.3:a:e-guardian:siteguard:7.00:update3:*:*:server:apache:*:* *cpe:2.3:a:e-guardian:siteguard:7.00:update4:*:*:server:apache:*:* *cpe:2.3:a:e-guardian:siteguard:7.00:update5:*:*:server:apache:*:* OR cpe:2.3:o:freebsd:freebsd:-:*:*:*:*:*:*:*
    Added CPE Configuration OR *cpe:2.3:a:e-guardian:siteguard:*:*:*:*:server:nginx:*:* versions from (including) 2.20 up to (excluding) 8.00 *cpe:2.3:a:e-guardian:siteguard:8.00:-:*:*:server:nginx:*:* *cpe:2.3:a:e-guardian:siteguard:8.00:update1:*:*:server:nginx:*:* *cpe:2.3:a:e-guardian:siteguard:8.00:update2:*:*:server:nginx:*:* *cpe:2.3:a:e-guardian:siteguard:8.00:update3:*:*:server:nginx:*:*
    Added CPE Configuration AND OR *cpe:2.3:a:e-guardian:siteguard:*:*:*:*:server:nginx:*:* versions from (including) 2.20 up to (excluding) 7.00 *cpe:2.3:a:e-guardian:siteguard:7.00:-:*:*:server:nginx:*:* *cpe:2.3:a:e-guardian:siteguard:7.00:update1:*:*:server:nginx:*:* *cpe:2.3:a:e-guardian:siteguard:7.00:update2:*:*:server:nginx:*:* *cpe:2.3:a:e-guardian:siteguard:7.00:update3:*:*:server:nginx:*:* *cpe:2.3:a:e-guardian:siteguard:7.00:update4:*:*:server:nginx:*:* *cpe:2.3:a:e-guardian:siteguard:7.00:update5:*:*:server:nginx:*:* OR cpe:2.3:o:freebsd:freebsd:-:*:*:*:*:*:*:*
    Added CPE Configuration OR *cpe:2.3:a:e-guardian:siteguard:*:*:*:*:server:internet_information_services:*:* versions from (including) 2.20 up to (excluding) 3.10 *cpe:2.3:a:e-guardian:siteguard:*:*:*:*:server:internet_information_services:*:* versions from (including) 4.10 up to (excluding) 8.00 *cpe:2.3:a:e-guardian:siteguard:8.00:update4:*:*:server:internet_information_services:*:*
    Added Reference Type JPCERT/CC: https://jvn.jp/en/jp/JVN88474777/ Types: Third Party Advisory
    Added Reference Type CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-106931 Types: US Government Resource
    Added Reference Type JPCERT/CC: https://www.eg-secure.co.jp/siteguard/news/alert-202610-1 Types: Vendor Advisory
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Oct. 21, 2026

    Action Type Old Value New Value
    Removed SSVC {'id': 'CVE-2026-106931', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-10-20T19:46:31.419792Z'}
    Added SSVC {'id': 'CVE-2026-106931', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-10-20T00:00:00+00:00'}
  • CVE CISA KEV Update by 9119a7d8-5eab-497f-8521-727c672e3725

    Oct. 20, 2026

    Action Type Old Value New Value
    Added Date Added 2026-10-20
    Added Due Date 2026-10-20
    Added Required Action 2026-10-20
    Added Vulnerability Name 2026-10-20
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Oct. 20, 2026

    Action Type Old Value New Value
    Added Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-106931
    Removed SSVC {'id': 'CVE-2026-106931', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-10-16T15:15:38.574629Z'}
    Added SSVC {'id': 'CVE-2026-106931', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-10-20T19:46:31.419792Z'}
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Oct. 16, 2026

    Action Type Old Value New Value
    Added SSVC {'id': 'CVE-2026-106931', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-10-16T15:15:38.574629Z'}
  • CVE Modified by [email protected]

    Oct. 14, 2026

    Action Type Old Value New Value
    Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/106xxx/CVE-2026-106931.json">CVE-2026-106931</a>
  • New CVE Received by [email protected]

    Oct. 14, 2026

    Action Type Old Value New Value
    Added Description SiteGuard Server Edition contains an OS command injection vulnerability, which may allow an attacker to execute arbitrary OS commands with root or SYSTEM privileges on the system running the affected product.
    Added CVSS V4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
    Added CVSS V3 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    Added CWE CWE-78
    Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/106xxx/CVE-2026-106931.json">CVE-2026-106931</a>
    Added Reference https://jvn.jp/en/jp/JVN88474777/
    Added Reference https://www.eg-secure.co.jp/siteguard/news/alert-202610-1
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 8.5
Attack Vector
Attack Complexity
Attack Requirements
Privileges Required
User Interaction
VS Confidentiality
VS Integrity
VS Availability
SS Confidentiality
SS Integrity
SS Availability
Base CVSS Score: 7.8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact