CVE-2026-49204: Hardcoded AWS Cognito Credentials in Acer Connect M6E 5G Firmware

Technical summary

CVE-2026-49204 stems from leftover debug code containing fixed credentials for AWS Cognito test sandboxes within Acer Connect M6E 5G firmware. The vulnerability is classified under CWE-798 (Use of Hard-Coded Credentials), a common mistake in development cycles where test or debugging credentials are not properly stripped before production firmware releases. An unauthenticated network attacker can leverage these credentials to gain unauthorized access to Cognito-backed services without requiring user interaction or elevated privileges. The CVSS 3.1 score of 6.5 (MEDIUM) reflects confidentiality and integrity impacts, but no direct availability impact from the credentials themselves.

Business impact

Organizations deploying Acer Connect M6E 5G devices face the risk of unauthorized access to AWS Cognito services that may authenticate users, manage identity tokens, or control backend provisioning. A compromise could lead to lateral movement within connected infrastructure, unauthorized data access, or modification of device configurations. While the vulnerability does not directly disable service availability, the loss of confidentiality and integrity controls over authentication could undermine trust in the device and any services it manages or connects to.

Affected systems

The vulnerability specifically impacts Acer Connect M6E 5G devices and their associated firmware (acer connect_m6e_5g_firmware, acer connect_m6e_5g). Any deployment of these devices in production or test environments is potentially at risk if firmware versions containing the debug modules have not been patched.

Exploitability

This vulnerability has a low barrier to exploitation. No user interaction is required, privilege escalation is unnecessary, and the attack surface is network-accessible. An attacker with network visibility to the device or services it communicates with can attempt to use the hardcoded credentials to authenticate directly. The credentials are static and non-rotating, meaning once disclosed, they remain valid until the firmware is updated. However, the vulnerability is not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog, suggesting active exploitation in the wild has not been documented at time of publication.

Remediation

Acer users should immediately identify any Connect M6E 5G devices in their environment and apply available firmware updates that remove debug modules and hardcoded credentials. Organizations should also audit AWS Cognito logs for any unusual authentication attempts using the compromised credentials and rotate or disable those test sandbox credentials in their AWS environments to prevent unauthorized access attempts.

Patch guidance

Check Acer's support portal and security advisories for firmware updates addressing CVE-2026-49204 for the Connect M6E 5G product line. Verify patch version numbers and release dates against official Acer documentation before deployment. Firmware updates should be staged in a test environment first to ensure compatibility with your network configuration. Once available patches are confirmed, prioritize devices in sensitive network segments (those with access to internal services or customer data).

Detection guidance

Monitor network traffic from Acer Connect M6E 5G devices for outbound authentication attempts to AWS Cognito endpoints using fixed or unusual credential patterns. Enable logging on AWS Cognito services to capture authentication attempts from the test sandbox credentials—anomalous successful logins or attempts from unexpected IP ranges should trigger investigation. Firmware analysis tools can extract and examine debug modules in current device firmware to confirm the presence of hardcoded credentials; work with Acer support or use trusted firmware analysis if in-house capability is limited.

Why prioritize this

Although the CVSS score is moderate, the combination of network accessibility, ease of exploitation, and absence of authentication barriers elevates practical risk. Hardcoded credentials that survive into production firmware are a persistent threat until patched, and their disclosure would immediately weaponize the vulnerability. Organizations should prioritize patching based on device placement: devices in DMZs, connected to sensitive services, or managing authentication are highest priority.

Risk score, explained

The CVSS 3.1 score of 6.5 reflects the attack vector (network-accessible), low attack complexity, no privilege requirement, and no user interaction needed—all factors that maximize reach. The score is tempered by the absence of direct availability impact; the credentials themselves do not directly crash services. However, the confidentiality and integrity impacts of unauthorized authentication access justify the MEDIUM severity rating. Organizations relying on Cognito for identity or access control should treat this as a high-priority patch regardless of the moderate CVSS score.

Frequently asked questions