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Vulnerability report

Exploited in the wild High confidence Not in CISA KEV

CVE-2026-106931

SiteGuard Server Edition for Apache httpd Command Injection

EG Secure Solutions / SiteGuard Server Edition for Apache httpd · affected before Ver8.00 Update 5

Watch CVE-2026-106931 Browse KEV feed

Severity: CVSS 8.5 · High
Confidence: High
Exploit status: Exploited in the wild
EPSS: 0.7%
First observed: —
Last observed: —

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-106931 is a vulnerability affecting EG Secure Solutions SiteGuard Server Edition for Apache httpd and 4 other products. SiteGuard Server Edition contains an OS command injection vulnerability, which may allow...

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is high. Also confirmed by third-party sources.

Who is affected?

EG Secure Solutions / SiteGuard Server Edition for Apache httpd affected before ver8.00 update 5.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

SiteGuard Server Edition for Apache httpd Command Injection

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.

Vendor Product Affected Status

EG Secure Solutions Inc. Affected

SiteGuard Server Edition for Apache httpd

Before Ver8.00 Update 5

Affected

EG Secure Solutions Inc. Affected

SiteGuard Server Edition for Nginx

Before Ver8.00 Update 5

Affected

EG Secure Solutions Inc. Affected

SiteGuard Server Edition for IIS

Before Ver8.00 Update 5

Affected

EG Secure Solutions Inc. Affected

SiteGuard Server Edition for Apache httpd on FreeBSD

Before Ver7.00 Update 6

Affected

EG Secure Solutions Inc. Affected

SiteGuard Server Edition for Nginx on FreeBSD

Before Ver7.00 Update 6

Affected

Published: 14 Oct 2026
Exploitation Reported: 15 Oct 2026
Attack vector: Local
Complexity: Low
Privileges: Low
User interaction: None

Tags

apache nginx

CVE References

CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2026-106931
eg-secure.co.jp/siteguard/news/alert-202610-1 eg-secure.co.jp · CVE Record https://www.eg-secure.co.jp/siteguard/news/alert-202610-1
jvn.jp/en/jp/JVN88474777 jvn.jp · CVE Record https://jvn.jp/en/jp/JVN88474777/

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

The Hacker News

Recorded 15 Oct 2026

A trusted third party reported exploitation.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access

Source	Added
The Hacker News First	2026-10-15 19:36 UTC
Security Affairs	2026-10-19 09:21 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts: 0; 0; 0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v4.0

8.5 High

Potential damage if exploited. Separate from whether attackers are using it.

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

EPSS

0.7%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') CWE-78

Recent mention · Security Affairs

19 Oct 2026

Japan’s SiteGuard WAF flaw CVE-2026-106931 is already being exploited

Attackers are exploiting vulnerability CVE-2026-106931 in SiteGuard Server Edition to run commands as root or SYSTEM. EG Secure Solutions published an urgent alert warning of CVE-2026-106931, an OS command injection bug in SiteGuard Server Edition. Threat actors are already...

Read full advisory

All CVSS Scores

CVSS v4.0 8.5 High

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS v3.0 7.8 High

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

All Mentions

Recent mention · Security Affairs

Japan’s SiteGuard WAF flaw CVE-2026-106931 is already being exploited

Security Affairs · 19 Oct 2026

Attackers are exploiting vulnerability CVE-2026-106931 in SiteGuard Server Edition to run commands as root or SYSTEM. EG Secure Solutions published an urgent alert warning of CVE-2026-106931, an OS command injection bug in SiteGuard Server Edition. Threat actors are already exploiting it in the wild. A successful exploit lets them run commands with root or SYSTEM […]

Recent mention · The Hacker News

ThreatsDay: Adobe RCE, DNS Wallet Theft, NVIDIA Container Escape, Self-Healing Backdoor + 23 More

The Hacker News · 15 Oct 2026

Ravie LakshmananOct 15, 2026Hacking News / Cybersecurity News 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 interesting in different ways. A small permission can lead to a big theft. A trusted login can hide the wrong person. Old bugs are finding new victims, familiar tools are being put to strange uses, and some flaws are so simple you wonder how nobody spotted them sooner. There's a lot more hiding in the details, including a few twists you...

Recent mention · Japan Vulnerability Notes (JVN)

SiteGuard Server Edition vulnerable to OS command injection

Japan Vulnerability Notes (JVN) · 14 Oct 2026

SiteGuard Server Edition provided by EG Secure Solutions Inc. contains an OS command injection vulnerability.

Timeline

From disclosure to observed exploitation

19 Oct 2026
09:21 UTC

KEV confirmed by Security Affairs

Exploitation attested by an external source
15 Oct 2026
19:36 UTC

Added to Previdian KEV Feed

High-confidence, third-party attested exploitation
14 Oct 2026
04:45 UTC

CVE published

Vulnerability disclosed publicly
07 Oct 2026
04:50 UTC

CVE ID reserved

Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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Evidence confidence and provenance
First-party sensor telemetry
PoC and scanner references
Affected versions and enrichment
Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-106931

Sample API response

{
  "cve_id": "CVE-2026-106931",
  "confidence": "High",
  "cvss_score": 8.5,
  "cvss_estimated": false,
  "epss_score": 0.00662,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}