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CVE-2026-106931

HIGH 8.5 KNOWN EXPLOITED

Published 2026-10-14 · Last modified 2026-10-21

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.

ACTIVELY EXPLOITED

Confirmed exploited in the wild — in CISA KEV since 2026-10-20. Patch or mitigate now.

Exploitation likelihood

2.5%chance of exploitation in 30 days · 85th percentile

● In CISA KEV (2026-10-20) ○ Catalogued PoC

Impact if exploited

8.5CVSS 4.0 · HIGH

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityHigh

What an attacker needs

  • ⚠Access: Requires local access to the host
  • ⚠Privileges: Requires a low-privilege account
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable
  • ✓Requirements: No special attack requirements

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Eg Secure Solutions Inc. E Guardian Freebsd

Products Siteguard Server Edition For Apache Httpd Siteguard Server Edition For Nginx Siteguard Server Edition For Iis Siteguard Server Edition For Apache Httpd On Freebsd Siteguard Server Edition For Nginx On Freebsd Siteguard Freebsd

Weakness (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

References and research data (JSON)

Additional exploitation reports

Source-specific reports, separate from CISA KEV. Repeated observations from one source are not independent confirmations.

  • VulnCheck KEV · 2026-10-14T00:00:00Z

    Source guidance: 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.

    Source ransomware assessment: Unknown

    VulnCheck KEV · CVE-2026-106931 · Updated 2026-10-14T00:00:00Z
  • VulnCheck KEV · 2026-10-14T00:00:00ZVulnCheck KEV · CVE-2026-106931
  • VulnCheck KEV · 2026-10-20T00:00:00ZVulnCheck KEV · CVE-2026-106931

Known Affected Software Configurations

VendorProductVersion range
E GuardianSiteguard≥ 2.20 and < 8.00
E GuardianSiteguard8.00
E GuardianSiteguard8.00
E GuardianSiteguard8.00
E GuardianSiteguard8.00
E GuardianSiteguard≥ 2.20 and < 7.00
E GuardianSiteguard7.00
E GuardianSiteguard7.00
E GuardianSiteguard7.00
E GuardianSiteguard7.00
E GuardianSiteguard7.00
E GuardianSiteguard7.00
E GuardianSiteguard≥ 2.20 and < 8.00
E GuardianSiteguard8.00
E GuardianSiteguard8.00
E GuardianSiteguard8.00
E GuardianSiteguard8.00
E GuardianSiteguard≥ 2.20 and < 7.00
E GuardianSiteguard7.00
E GuardianSiteguard7.00
E GuardianSiteguard7.00
E GuardianSiteguard7.00
E GuardianSiteguard7.00
E GuardianSiteguard7.00
E GuardianSiteguard≥ 2.20 and < 3.10
E GuardianSiteguard≥ 4.10 and < 8.00
E GuardianSiteguard8.00

All CVSS metrics

  • HIGH 7.8 v3.0 · CNA Primary
    CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  • HIGH 8.5 v4.0 · CNA Primary
    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
  • HIGH 8.5 v4.0 · NVD Secondary
    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
  • HIGH 7.8 v3.0 · NVD Secondary
    CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS