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Response snapshot Oct 26, 2026, 18:55 UTC

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VulnerabilityCVE-2026-106931Known exploitation

EG Secure Solutions SiteGuard Server Edition OS Command Injection Vulnerability

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.

At a glance

Exploited
Yes: on CISA's Known Exploited list
Severity
8.5 High (CVSS 4.0)
Chance of exploitation
2.5% in the next 30 days
CISA federal deadline
Oct 23, 2026: passed
Sources
4 independent sources

What to do

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.

Read CISA KEV entry CVE-2026-106931 (opens a new tab)

CISA federal deadline

Federal due date passed

Applies to covered US federal agencies; it is not your organization's deadline.

Added to the catalog Known ransomware use: Unknown
CISA catalog (opens a new tab)

Scores and how they were measured

CVSS base severity

8.5

Version 4.0As of

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

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

2.5%

Scored Percentile 84.8%

Model and measurement source (opens a new tab)

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    CISA KEV entry CVE-2026-106931 (opens a new tab)

    The CVE-2026-106931 catalog entry establishes known exploitation, date added, required action, and the federal due date; not zero-day status.

    Published Checked

  2. Primary source

    JPCERT/CC Japan Advisories: Security alert: OS command injection vulnerability in SiteGuard Server Edition (CVE-2026-106931) (published) (opens a new tab)

    Exact official article/advisory identified by the feed; title, source dates, and any supplied article excerpt.

    Published Checked

  3. Primary source

    JPCERT/CC Japan Advisories syndication feed (opens a new tab)

    The RSS/Atom/RDF entry supplied this exact link and any available title, date, and excerpt.

    Published Date not suppliedChecked

  4. Primary source

    NVD CVE-2026-106931 (opens a new tab)

    NVD record: description, CVSS, affected products, and a CISA SSVC assessment reporting active exploitation.

    Published Checked

  5. Primary source

    Vendor advisory (via NVD references) (opens a new tab)

    The vendor advisory referenced by the CVE record, for affected versions and fixes.

    Published Date not suppliedChecked

  6. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  7. Primary source

    FIRST measured EPSS score (opens a new tab)

    Measured EPSS probability and percentile for CVE-2026-106931, scored 2026-10-25. This is a model estimate, not proof of exposure.

    Published Checked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 21). EG Secure Solutions SiteGuard Server Edition OS Command Injection Vulnerability (CVE-2026-106931). https://kevwire.com/record/CVE-2026-106931

MLA

"EG Secure Solutions SiteGuard Server Edition OS Command Injection Vulnerability (CVE-2026-106931)." KEVWire, 21 Oct. 2026, kevwire.com/record/CVE-2026-106931.

Chicago

KEVWire. "EG Secure Solutions SiteGuard Server Edition OS Command Injection Vulnerability (CVE-2026-106931)." Last modified October 21, 2026. https://kevwire.com/record/CVE-2026-106931.

Evidence summary (plain text)

EG Secure Solutions SiteGuard Server Edition OS Command Injection Vulnerability (Oct 20, 2026).
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.
CVSS 8.5 (version 4.0; evidence as of Oct 21, 2026; https://nvd.nist.gov/vuln/detail/CVE-2026-106931).
EPSS 2.5% for the following 30 days, scored Oct 25, 2026 (https://api.first.org/data/v1/epss?cve=CVE-2026-106931&date=2026-10-25).
Sources:
CISA KEV entry CVE-2026-106931: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json
JPCERT/CC Japan Advisories: Security alert: OS command injection vulnerability in SiteGuard Server Edition (CVE-2026-106931) (published): https://www.jpcert.or.jp/at/2026/at260032.html
JPCERT/CC Japan Advisories syndication feed: https://www.jpcert.or.jp/rss/jpcert.rdf
NVD CVE-2026-106931: https://nvd.nist.gov/vuln/detail/CVE-2026-106931
Vendor advisory (via NVD references): https://www.eg-secure.co.jp/siteguard/news/alert-202610-1
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?pubStartDate=2026-10-12T13:35:55.142Z&pubEndDate=2026-10-26T13:35:55.142Z&resultsPerPage=500&startIndex=2500
FIRST measured EPSS score: https://api.first.org/data/v1/epss?cve=CVE-2026-106931&date=2026-10-25
Record ID: CVE-2026-106931.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Documented by a cited source.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
CISA federal due date: Oct 23, 2026. This is a deadline for covered US federal agencies, not the reader's SLA.
About this data

This record was ingested from a data source. Retrieved: Oct 26, 2026, 13:40 UTC. Ingestion is not an independent editorial investigation.

CISA added this entry on 2026-10-20. This record's publication date is the catalog addition date, not necessarily the initial vulnerability disclosure. KEV means known exploitation, not necessarily a zero-day. CISA due dates apply to covered US federal agencies, not your organizational SLA.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

Record JSON

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Record details

Record detail