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CVE-2026-124003: XWEB EVO Security Vulnerability

CVE-2026-124003 explained: high Security Vulnerability in XWEB EVO. CVSS 8.5. Affected versions, detection, fixes and CTEM priority.

Last updated: Nov 12, 2026

CVSS
8.5 HIGH
EPSS
n/a
CISA KEV
Not listed
CWE
CWE-250

Sources: National Vulnerability Database, CVE.org, CISA KEV, FIRST EPSS

CVE-2026-124003 Overview

XWEB EVO before 5.6.2 contains a command injection vulnerability where the setuid-root Lua CGI interpreter wlua executes system("/usr/bin/lua "+argv) on unsanitized input. Attackers can craft malicious input reached through a .lua CGI endpoint to inject arbitrary commands into the concatenated argv string, achieving command execution with root privileges. This product line reached it's end of service date in March 2026.

Critical Impact

Local or adjacent, authenticated attackers can exploit this Security Vulnerability in XWEB EVO. The CVSS base score is 8.5 (High).

Affected Products

  • XWEB EVO: see the vendor advisory for the exact affected versions

Discovery Timeline

  • 2026-11-12: CVE-2026-124003 published to the National Vulnerability Database by disclosure@vulncheck.com
  • 2026-11-12: last updated in the NVD database

Technical Details for CVE-2026-124003

Vulnerability Analysis

CVE-2026-124003 is a Security Vulnerability weakness (CWE-250) in XWEB EVO. Based on its CVSS vector, the flaw needs local or adjacent access, needs some level of access, and needs no user interaction.

With a CVSS base score of 8.5, apply the vendor fix and confirm exposure on internet facing and business critical assets first.

Root Cause

The vendor description states: XWEB EVO before 5.6.2 contains a command injection vulnerability where the setuid-root Lua CGI interpreter wlua executes system("/usr/bin/lua "+argv) on unsanitized input. Attackers can craft malicious input reached through a .lua CGI endpoint to inject arbitrary commands into the concatenated argv string, achieving command execution with root privileges. This product line reached it's end of service date in March 2026.

Attack Vector

Based on the CVSS vector, the flaw needs local or adjacent access, needs some level of access, and needs no user interaction. Attack complexity is low complexity.

No exploitation in the wild is confirmed by CISA at the time of the last update. Check the references below for any vendor or researcher proof of concept.

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

Detection Methods for CVE-2026-124003

Detection Strategies

  • Inventory every instance of XWEB EVO and compare the running version with the affected range above.
  • Check external attack surface scans for internet facing instances of the component.
  • Run an authenticated vulnerability scan once your scanner ships a check for this CVE.

Monitoring Recommendations

  • Forward XWEB EVO application, access and audit logs to your SIEM for retrospective hunting.
  • Alert on new processes, configuration changes or outbound connections from the affected service.
  • Track the vendor advisory and the CISA KEV catalog for changes in exploitation status.

How to Mitigate CVE-2026-124003

Immediate Actions Required

  • Apply the fixed version of XWEB EVO named in the vendor advisory.
  • Prioritize internet facing and business critical instances first.
  • Rescan after the change to confirm the exposure is closed.

Patch Information

Use the fixed version listed in the vendor advisory for XWEB EVO.

Workarounds

  • If patching must wait, restrict network access to the affected service and place it behind authentication or a web application firewall rule.

CWE References

Technical References

This entry is built directly from NVD, CISA KEV and EPSS data. Verify fixed versions in the vendor advisory before you deploy.

Frequently asked questions

CVE-2026-124003 is a high severity Security Vulnerability in XWEB EVO with a CVSS score of 8.5. Apply the vendor fix and confirm exposure on internet facing and business critical assets first.

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