Overview
CVE-2025-26692 identifies a critical security vulnerability affecting SIOS Quick Agent V2 and V3. Specifically, Quick Agent V3 versions prior to 3.2.1 and Quick Agent V2 versions prior to 2.9.8 are affected. This vulnerability involves improper limitation of a pathname to a restricted directory, commonly known as a Path Traversal issue.
Technical Details
The vulnerability is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory. Affected versions fail to adequately validate file paths, allowing remote unauthenticated attackers to traverse directories and access files outside the intended root directory. If exploited, this can result in the execution of arbitrary code with Windows system privileges.
Because the software runs with elevated permissions, successful exploitation could allow complete system compromise, depending on the attacker’s ability to control or manipulate uploaded file paths.
Severity and CVSS Scores
This vulnerability has received the following CVSS ratings:
- CVSS v3.0: 8.1 (High) –
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS v4.0: 9.2 (Critical) –
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
These scores reflect the seriousness of the issue, highlighting its remote exploitability, lack of required user interaction, and the high impact on confidentiality, integrity, and availability.
Potential Impact
If left unpatched, this vulnerability could allow attackers to:
- Read or modify sensitive system files
- Install and execute malicious programs
- Fully compromise affected systems
The risk is elevated due to the lack of authentication needed and the ability to exploit the issue over a network.
Mitigation
- Upgrade to: Quick Agent V3 version 3.2.1 or later, and Quick Agent V2 version 2.9.8 or later.
- Restrict network access: Ensure that only trusted systems can reach the agent endpoints.
- Monitor system logs: Look for abnormal file access patterns or unexpected file executions.
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