What is the CVSS score of CVE-2026-91853?

CVE-2026-91853 has a CVSS 4.0 base score of 2.1 (Low). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:P. EPSS exploitation probability: 1.4%.

Is there a public PoC exploit available for CVE-2026-91853?

Yes, a public proof-of-concept exploit is available for CVE-2026-91853. Prioritise patching immediately. EPSS: 1.4%.

X5000R CVE-2026-91853

EUVD-2026-78822 LOW

OS Command Injection (CWE-78)

2026-09-15 VulDB

GHSA-q4rv-4ppf-7295

Command Injection TOTOLINK X5000R

2.1

CVSS 4.0 · Vendor: VulDB

View

Vulnerability Assessment

Weakness

CWE

CWE-78

OWASP Top 10:2025

A05:2025 - Injection

ASVS 5.0

V1 - Encoding and Sanitization OS command sanitization, avoid shell exec

MITRE ATT&CK

2 techniques across 1 tactic: Execution

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Monitor Track and reassess. Why: LOW severity (CVSS 0.1-3.9).

No patch listed yet 1.4% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 15, 2026

OS command injection in the exportOvpn handler of the TOTOLINK X5000R router firmware (9.1.0cu.2089_B20211224 and potentially other versions) allows an authenticated web-UI user to inject shell metacharacters through the 'filetype' argument supplied to /cgi-bin/cstecgi.cgi?action=exportOvpn&type=user, resulting in commands executed with the privileges of the underlying CGI process. The flaw is remotely reachable (CVSS 4.0 AV:N/AC:L/AT:N/PR:L/UI:N) and publicly available exploit code exists, so any X5000R with an exposed or weakly-credentialed management interface should be treated as at risk. Impact per the supplied vector is limited (VC:L/VI:L/VA:L) but on an embedded device a successful injection typically yields full control of the appliance and its configuration.

Affected VersionsENISA

X5000R 9.1.0cu.2089_B20211224

Affected Packages

euvd x5000r no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (VulDB) PRIMARY 2.1 MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:P

Primary rating from Vendor (VulDB) · only source for this CVE.

CVSS VectorVendor: VulDB

Attack Vector

Network

Attack Complexity

Low

Attack Requirements

None

Privileges Required

Low

User Interaction

None

Vulnerable system: Confidentiality

Low

Vulnerable system: Integrity

Low

Vulnerable system: Availability

Low

Subsequent system: Confidentiality

Low

Subsequent system: Integrity

Low

Subsequent system: Availability

Low

Lifecycle Timeline

Severity Changed

Sep 15, 2026 - 17:22 NVD

MEDIUM LOW

CVSS changed

Sep 15, 2026 - 17:22 NVD

5.3 (MEDIUM) 2.1 (LOW)

CVE Published

Sep 15, 2026 - 16:15 cve.org

MEDIUM 5.3

DescriptionCVE.org

A vulnerability has been found in TOTOLINK X5000R 9.1.0cu.2089_B20211224. The impacted element is the function exportOvpn of the file /cgi-bin/cstecgi.cgi?action=exportOvpn&type=user of the component Export Ovpn Handler. The manipulation of the argument filetype leads to os command injection. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.

Threat Intelligence Overview

EPSS Score

1.4%

Top 29% exploitable

Exploit

POC

Public exploit code exists

Data Quality

7 sources

Confidence: High

EUVD

NVD

CVE.org

EPSS

Vulnrichment

GitHub

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity LOW

CISA KEV No

Public POC Yes

EPSS 1.4%

Patch available No

Active threat No

Deciding rule

LOW severity (CVSS 0.1-3.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.