What is the CVSS score of CVE-2026-27653?

CVE-2026-27653 has a CVSS 3.1 base score of 6.7 (Medium). CVSS vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

How to fix or mitigate CVE-2026-27653?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Review and tighten file/resource permissions.

Securebrowser For Onegate CVE-2026-27653

MEDIUM

Incorrect Default Permissions (CWE-276)

2026-02-27 vultures@jpcert.or.jp

Privilege Escalation RCE Securebrowser For Onegate Securebrowser Ii Secureworkspace Soliton

6.7

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-276 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V13 - Configuration Default permission hardening MITRE ATT&CK 1 technique across 1 tactic: Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS 6.7 (MEDIUM). Attack vector: Local. Complexity: High. Privileges required: Low. User interaction: Required.
Exploit ScenarioDerived	An attacker could exploit this vulnerability to arbitrary code to be executed with SYSTEM privileges.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

No patch listed yet 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Soliton Systems installers for Securebrowser For Onegate, Secureworkspace, and Securebrowser II fail to set proper file permissions during installation, enabling local authenticated users to execute arbitrary code with SYSTEM privileges. An attacker with user-level access can exploit this misconfiguration to achieve full system compromise. No patch is currently available.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 6.7

The installers for multiple products provided by Soliton Systems K.K. contain an issue with incorrect default permissions, which may allow arbitrary code to be executed with SYSTEM privileges. [CVSS 6.7 MEDIUM]

RemediationAI

Monitor vendor advisories for a patch.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

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

Technical ContextAI · show details

Classified as CWE-276 (Incorrect Default Permissions). The installers for multiple products provided by Soliton Systems K.K. contain an issue with incorrect default permissions, which may allow arbitrary code to be executed with SYSTEM privileges.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 6.7 MEDIUM

AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionCVE.org

The installers for multiple products provided by Soliton Systems K.K. contain an issue with incorrect default permissions, which may allow arbitrary code to be executed with SYSTEM privileges.

Executive ViewAI

Why It Matters

Organizations using installers for multiple products provided by Soliton Systems K.K. contain an should be aware of notable risk from CVE-2026-27653, a incorrect default permissions vulnerability rated CVSS 6.7. Attackers could gain access beyond their authorized level. Organizations should apply vendor updates when available and monitor for exploitation.

Business Impact: Moderate

Compensating Controls

Apply vendor patch. If patching is delayed: manually tighten permissions on affected resources.

Threat Intelligence Overview

EPSS Score

0.0%

Top 99% exploitable

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS

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 MEDIUM

CISA KEV No

Public POC No

EPSS 0.0%

Patch available No

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

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.

SSVC AssessmentENISA

Exploitation· derived

None

System Exposure· derived

Small

Automatable· derived

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +34

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Privilege Escalation HIGH

Privilege escalation occurs when an attacker leverages flaws in access control mechanisms to gain permissions beyond what they were originally granted.

Remote Code Execution CRITICAL

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.