CVE-2026-49203 Overview
CVE-2026-49203 is a missing authorization vulnerability [CWE-287] affecting management API endpoints used for cellular eSIM allocation. The endpoints do not validate caller authorization before processing requests. An attacker on an adjacent network can rewrite or delete remote eSIM profiles without holding valid credentials. The flaw impacts the integrity and availability of cellular connectivity for affected devices.
Critical Impact
Unauthenticated callers on the adjacent network can overwrite or delete eSIM profiles, disrupting cellular connectivity and enabling potential hijack of mobile identity provisioning.
Affected Products
The NVD record does not enumerate affected products. The only vendor reference attached to this CVE is an Acer Community Article describing the issue. Administrators should consult that advisory to confirm impacted device models and firmware revisions.
Discovery Timeline
- 2026-06-04 - CVE-2026-49203 published to NVD
- 2026-06-04 - Last updated in NVD database
Technical Details for CVE-2026-49203
Vulnerability Analysis
The vulnerability stems from management API endpoints responsible for cellular eSIM profile allocation. These endpoints process privileged operations such as rewriting or deleting embedded SIM profiles. The API handlers omit an authorization check on the caller before executing the requested action. Any party able to reach the endpoint on the adjacent network can therefore invoke profile management functions reserved for trusted administrators. The result is a broken access control flaw that violates integrity and availability of the mobile identity layer.
Root Cause
The root cause is missing authorization enforcement in the API layer, classified under [CWE-287] Improper Authentication. The endpoint authenticates the underlying transport but does not bind the request to an authorized principal. Profile rewrite and delete operations are executed without confirming the caller's role or scope.
Attack Vector
Exploitation requires adjacent network access to the device exposing the management API. The attacker sends crafted requests to the eSIM allocation endpoints without supplying valid credentials. No user interaction is required. Successful requests overwrite the existing eSIM profile or remove it entirely, severing cellular service or redirecting provisioning. Refer to the Acer Community Article for endpoint specifics.
Detection Methods for CVE-2026-49203
Indicators of Compromise
- Unexpected eSIM profile changes, including silent profile deletion or replacement on managed devices.
- API requests to eSIM management endpoints originating from hosts outside the documented provisioning infrastructure.
- Loss of cellular connectivity coinciding with administrative API traffic on adjacent network segments.
Detection Strategies
- Inspect application logs from the cellular management service for profile rewrite or delete operations lacking an associated administrator session.
- Correlate eSIM lifecycle events with authenticated administrator activity and flag mismatches.
- Monitor adjacent network segments for unauthorized hosts probing management API ports.
Monitoring Recommendations
- Enable verbose audit logging on the eSIM management API and forward logs to a central analytics platform.
- Alert on any HTTP method (PUT, DELETE, POST) targeting eSIM profile paths from non-allowlisted source addresses.
- Track baseline counts of profile mutations per device and alert on anomalies.
How to Mitigate CVE-2026-49203
Immediate Actions Required
- Restrict access to the cellular management API to trusted management VLANs and administrative hosts only.
- Apply the firmware update referenced in the Acer Community Article once available for your device model.
- Audit current eSIM profiles to confirm that no unauthorized changes have already occurred.
Patch Information
Vendor remediation guidance is published in the Acer Community Article. Apply the firmware or management service update specified in that advisory. The NVD entry does not list specific fixed version numbers at the time of publication.
Workarounds
- Segment the management network so the eSIM API is unreachable from general-purpose adjacent networks.
- Place a firewall or access control list in front of the API to deny requests from untrusted sources.
- Disable remote eSIM management features if they are not required in your deployment.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
