CVE-2026-49190 Overview
CVE-2026-49190 is a critical authorization flaw where the affected system fails to validate instructional permissions across multiple internal operation codes (opcodes). The missing permission checks allow an attacker with low-level access to install unauthorized applications or execute arbitrary commands. The vulnerability is categorized under [CWE-78] (OS Command Injection) and is exploitable over the network with low attack complexity. Acer has published guidance on the issue in an Acer Community Article. The flaw scores 9.4 on CVSS v4.0, reflecting high impact to confidentiality, integrity, and availability of both the vulnerable component and downstream subsequent systems.
Critical Impact
Authenticated attackers can invoke unprotected opcodes to install applications or run operating system commands, leading to full system compromise.
Affected Products
- Acer software components referenced in the vendor advisory
- Specific affected versions are not enumerated in the NVD entry
- Refer to the Acer Community Article for the authoritative product list
Discovery Timeline
- 2026-06-04 - CVE-2026-49190 published to NVD
- 2026-06-04 - Last updated in NVD database
Technical Details for CVE-2026-49190
Vulnerability Analysis
The vulnerability resides in the dispatch logic that processes internal operation codes (opcodes). Each opcode represents a discrete instruction the service can perform, including privileged actions such as installing applications and executing shell commands. The dispatcher does not consistently enforce permission checks before invoking these handlers. An attacker who reaches the opcode interface can therefore request privileged operations without holding the required entitlements. Because the issue spans multiple opcodes rather than a single handler, the attack surface is broad and a single bypass technique applies across many privileged actions.
Root Cause
The root cause is missing or inconsistent authorization enforcement across the opcode dispatch table. Permission validation appears to be implemented per-handler rather than centrally, and several handlers omit the check entirely. This is consistent with the [CWE-78] classification because affected opcodes ultimately pass attacker-controlled input to operating system command execution paths without sufficient gating.
Attack Vector
The CVSS vector indicates network-reachable exploitation requiring low privileges and no user interaction. An authenticated attacker sends crafted requests targeting the unprotected opcodes. The handlers then execute the requested operation, such as installing a chosen package or running a command, under the privileges of the vulnerable service. Because the scope metrics report high impact to subsequent systems, successful exploitation can pivot from the vulnerable component into the broader host environment.
No verified proof-of-concept code is published in the NVD record. Refer to the Acer Community Article for vendor-specific technical detail.
Detection Methods for CVE-2026-49190
Indicators of Compromise
- Unexpected installation of applications or MSI packages on hosts running the affected service
- Child processes such as cmd.exe, powershell.exe, or /bin/sh spawned from the vulnerable service account
- Outbound network connections from the service to attacker-controlled download infrastructure
- New scheduled tasks, services, or autorun entries created by the vulnerable process
Detection Strategies
- Inspect process lineage for the affected service and alert when it spawns shell interpreters or installer binaries
- Monitor opcode-handling endpoints for high-frequency or anomalous request patterns from authenticated users
- Correlate authentication telemetry with privileged actions to identify low-privilege accounts performing administrative tasks
Monitoring Recommendations
- Enable command-line auditing and forward process creation events to a centralized analytics platform
- Track software installation events and reconcile them against approved change-management tickets
- Alert on creation of persistence artifacts originating from the vulnerable service
How to Mitigate CVE-2026-49190
Immediate Actions Required
- Apply the vendor-provided update referenced in the Acer Community Article
- Restrict network access to the opcode interface to trusted management networks only
- Rotate credentials for any low-privilege accounts that can reach the affected service
- Review installed applications and scheduled tasks on affected hosts for unauthorized changes
Patch Information
Acer has published remediation guidance through its support knowledge base. Administrators should consult the Acer Community Article for the patched version and deployment instructions. The NVD entry does not enumerate fixed versions, so vendor documentation is authoritative.
Workarounds
- Block external access to the management interface that exposes the opcode dispatcher
- Run the affected service under a least-privileged account to limit post-exploitation impact
- Apply application allow-listing to prevent execution of unauthorized installers and interpreters
- Disable the affected component on systems that do not require it until the patch is applied
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
