CVE-2026-57205 microsoft CVE debrief

Who should care

Users of SimpleChat version prior to 0.241.203 should be aware of this vulnerability and take steps to update their installation. This includes reviewing and adjusting user permissions and access controls, as well as monitoring for suspicious activity on the affected endpoints.

Technical summary

The authenticated GET /api/user/info/<user_id> and GET /api/user/profile-image/<user_id> endpoints in application/single_app/route_backend_users.py accepted a caller-supplied user_id and read the matching Cosmos DB user-settings document without object-level authorization. This allowed a low-privilege authenticated user to retrieve another user's email address, display name, and profile image. The issue is fixed in version 0.241.203.

Defensive priority

Medium

Recommended defensive actions

• Update SimpleChat to version 0.241.203 or later
• Review and adjust user permissions and access controls
• Monitor for suspicious activity on the affected endpoints
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-16T16:19:14.050Z and was last modified on 2026-07-16T17:13:54.870Z. The NVD entry is currently Deferred. This information is based on the provided source corpus. Further verification is recommended to ensure accuracy.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.