CVE-2026-49197 Acer CVE debrief

Who should care

Organizations operating Acer Connect app infrastructure, security teams managing remote access or mobile companion applications, and network defenders responsible for API endpoint security should prioritize monitoring and patching for this vulnerability.

Technical summary

CVE-2026-49197 affects web endpoints in the Acer Connect application. The endpoints' authentication mechanism does not correctly handle cases where Base64 decoding of the HTTP Authorization header fails. Rather than rejecting the request upon decoding failure, the application proceeds without proper authentication validation. This flaw permits attackers to potentially bypass authentication controls by supplying malformed or crafted Authorization headers. The vulnerability is classified under CWE-287 (Improper Authentication) and carries a critical CVSS score of 10.0. No known exploitation in ransomware campaigns has been documented, and the vulnerability is not listed in CISA KEV.

Defensive priority

CRITICAL

Recommended defensive actions

• Review and restrict network access to Acer Connect app web endpoints until patches are available.
• Implement additional authentication and authorization controls at the network edge (e.g., reverse proxy, API gateway) to supplement the application's header validation.
• Monitor for anomalous HTTP requests to Acer Connect endpoints, particularly those with malformed or missing Authorization headers.
• Apply vendor-provided patches or firmware updates for the Acer Connect app when released; verify fixes address Base64 decoding failure handling in Authorization header validation.
• Conduct authentication flow testing on Acer Connect deployments to confirm proper rejection of requests with invalid or unparseable Authorization headers.

Evidence notes

The vulnerability description indicates that web endpoints for the Acer Connect app do not properly validate the HTTP Authorization header. Specifically, when Base64 decoding of the header fails, the application does not block the request. This improper authentication validation (CWE-287) could allow unauthorized access to protected endpoints. The CVSS 4.0 vector indicates network attack vector with low attack complexity, no privileges required, and no user interaction needed, with high impacts across confidentiality, integrity, and availability for both the vulnerable system and subsequent systems. The vendor attribution to Acer is derived from reference domain candidate evidence and the Acer community knowledge base article reference; vendor confidence is marked low and flagged for review.

Official resources