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CVE.org (no NVD analysis yet)· CNA jpcert

CVE-2026-106931: SiteGuard Server Edition contains an OS command injection vulnerability, which may allow an attacker to execute arbitrary OS commands with r

Noroxi assessment

Priority: This week (action score 65/100)

  • CISA has confirmed exploitation in the wild (Oct 20, 2026). Remediation deadline for US federal agencies: Oct 23, 2026.
  • Probability of exploitation in the next 30 days: 2.5% (FIRST EPSS); higher than 84.8% of all records.
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: EG Secure Solutions Inc. SiteGuard Server Edition for Apache httpd Ver8.00 Update 5; EG Secure Solutions Inc. SiteGuard Server Edition for Apache httpd on FreeBSD Ver7.00 Update 6; EG Secure Solutions Inc. SiteGuard Server Edition for IIS Ver3.10, Ver8.00 Update 5.

Don’t wait for the next maintenance window. Upgrade to EG Secure Solutions Inc. SiteGuard Server Edition for Apache httpd Ver8.00 Update 5; EG Secure Solutions Inc. SiteGuard Server Edition for Apache httpd on FreeBSD Ver7.00 Update 6; EG Secure Solutions Inc. SiteGuard Server Edition for IIS Ver3.10, Ver8.00 Update 5 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS

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.

HighCVSS 8.5 · v4.0KEVWeaponized Fix available
Published
Oct 14, 2026
Updated
Oct 21, 2026
EPSS
2.5% · 84th percentile

Report tools

JSON

Action score

65

This week

Don’t wait for the next maintenance window.

CVSS
34 / 40 · 8.5 / 10
CISA KEV
30 / 30 · Listed
EPSS
1 / 30 · 2.5%

CISA SSVC decision

Exploitation
active
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · jpcert
7.8
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Oct 20, 2026. That signals real attacks, not theory.

Remediation deadline for US federal agencies: Oct 23, 2026.

Get told when this record changes

  • In CISA KEV: exploitation in the wild confirmed
  • Weaponized exploit exists
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-106931

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
e-guardiansiteguard
freebsdfreebsd

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • e-guardian siteguard2.20 and later · before 8.00
  • e-guardian siteguard2.20 and later · before 7.00
  • e-guardian siteguard2.20 and later · before 3.10
  • e-guardian siteguard4.10 and later · before 8.00
  • e-guardian siteguard7.00
  • e-guardian siteguard8.00

Versions reported by the vendor

Affected version ranges reported by the assigning authority (jpcert). Independent of NVD's CPE analysis and usually ahead of it.

  • EG Secure Solutions Inc. SiteGuard Server Edition for Apache httpd

    • Ver2.20 and later · before Ver8.00 Update 5affected · semver

  • EG Secure Solutions Inc. SiteGuard Server Edition for Apache httpd on FreeBSD

    • Ver2.20 and later · before Ver7.00 Update 6affected · semver

  • EG Secure Solutions Inc. SiteGuard Server Edition for IIS

    • Ver2.20 and later · before Ver8.00 Update 5affected · semverfixed in Ver3.10

  • EG Secure Solutions Inc. SiteGuard Server Edition for Nginx

    • Ver2.20 and later · before Ver8.00 Update 5affected · semver

  • EG Secure Solutions Inc. SiteGuard Server Edition for Nginx on FreeBSD

    • Ver2.20 and later · before Ver7.00 Update 6affected · semver

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
EG Secure Solutions Inc. SiteGuard Server Edition for Apache httpdVer8.00 Update 5Vendor (CNA)
EG Secure Solutions Inc. SiteGuard Server Edition for Apache httpd on FreeBSDVer7.00 Update 6Vendor (CNA)
EG Secure Solutions Inc. SiteGuard Server Edition for IISVer3.10Vendor (CNA)
EG Secure Solutions Inc. SiteGuard Server Edition for IISVer8.00 Update 5Vendor (CNA)
EG Secure Solutions Inc. SiteGuard Server Edition for NginxVer8.00 Update 5Vendor (CNA)
EG Secure Solutions Inc. SiteGuard Server Edition for Nginx on FreeBSDVer7.00 Update 6Vendor (CNA)

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. CISA KEV+6 d
  4. TodayOct 28, 2026+14 d
EPSS, last 120 days+2% in 7 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
X

Weakness class (CWE)

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

CVSS vector

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/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

nvd-secondary

Root cause

User input is inserted as text into a shell command. The shell may interpret special characters in the input as part of the command.

The bug in code

The whole CWE-78 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
const host = req.body.host;exec("ping -c 1 " + host, onResult);

Fixed

ts
const host = req.body.host;if (!/^[a-z0-9.-]{1,253}$/i.test(host)) return res.sendStatus(400);execFile("ping", ["-c", "1", host], onResult);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. SSVC exploitationnone → active
  2. Exploit maturitynone → weaponized
  3. KEV✗ → ✓
  4. SSVC exploitation— → none
  5. Exploit maturity— → none
  6. Fix✗ → ✓
  7. CVSS7.8 → 8.5

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References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records