What is the CVSS score of CVE-2026-20910?

CVE-2026-20910 has a CVSS 3.1 base score of 8.0 (High). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H. EPSS exploitation probability: 0.3%.

Which versions of Xweb 300d Pro Firmware are affected by CVE-2026-20910?

A high-severity remote code execution vulnerability in XWEB Pro 1.12.1 and earlier allows authenticated users to execute arbitrary commands on affected systems.

How to fix or mitigate CVE-2026-20910?

Within 24 hours: Identify all systems running XWEB Pro 1.12.1 or earlier and restrict network access to firmware update functionality. Within 7 days: Implement WAF rules to block malicious input patterns in the devices field and disable firmware update features if operationally feasible. Within 30 days: Monitor vendor for patch availability, evaluate upgrade to newer versions, or plan migration to alternative solutions if patches remain unavailable.

Xweb 300d Pro Firmware CVE-2026-20910

HIGH

OS Command Injection (CWE-78)

2026-02-27 ics-cert@hq.dhs.gov

RCE Command Injection Xweb 300d Pro Firmware Xweb 500b Pro Firmware Xweb 500d Pro Firmware

8.0

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.0 HIGH

AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

High

Privileges Required

High

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

CVE Published

Feb 27, 2026 - 01:16 nvd

HIGH 8.0

DescriptionCVE.org

An OS command injection vulnerability exists in XWEB Pro version 1.12.1 and prior, enabling an authenticated attacker to achieve remote code execution on the system by injecting malicious input into the devices field of the firmware update update action to achieve remote code execution.

AnalysisAI

Remote code execution in XWEB Pro firmware versions 1.12.1 and earlier allows authenticated attackers to execute arbitrary OS commands by injecting malicious input through the devices field during firmware update operations. The vulnerability affects multiple Xweb Pro models (500d, 500b, and 300d) and requires high-level privileges to exploit, though it can impact the entire system. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Authenticate to XWEB Pro

Exploit

Access firmware update action

Execution

Inject OS commands into devices field

Impact

Execute arbitrary commands on system

Access

Authenticate to XWEB Pro

Exploit

Access firmware update action

Execution

Inject OS commands into devices field

Impact

Execute arbitrary commands on system

Vulnerability AssessmentAI

Exploitation	Authenticated attacker with high-level privileges required. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	CVSS 8.0 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	A remote attacker (requires authentication) could exploit this vulnerability to compromise the affected system.
Remediation	Monitor vendor advisories for a patch. … Detailed patch versions, workarounds, and compensating controls in full report.