EUVD-2026-44941Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Network-accessible REST API requires only a valid user session (PR:L); no complexity or interaction needed; impact is read-only exposure of profile metadata, no integrity or availability effect.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Lifecycle Timeline
4DescriptionCVE.org
SimpleChat is a secure AI conversation application with personal and group workspaces for document-grounded interactions. Prior to 0.241.203, 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, allowing a low-privilege authenticated user to retrieve another user's email address, display name, and profile image. This issue is fixed in version 0.241.203.
AnalysisAI
Insecure Direct Object Reference (IDOR) in Microsoft SimpleChat exposes any authenticated user's profile data to other authenticated users without authorization checks. The GET /api/user/info/<user_id> and GET /api/user/profile-image/<user_id> endpoints in route_backend_users.py accept a caller-supplied user_id and query the Cosmos DB user-settings document directly, bypassing object-level authorization - enabling enumeration of email addresses, display names, and profile images across the entire user base. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid authenticated session in the SimpleChat application - any user account, regardless of privilege level, is sufficient (CVSS PR:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 4.3 (Medium) accurately captures the bounded impact: AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N indicates network-reachable exploitation with no attack complexity, requiring only a low-privilege account, with limited confidentiality impact and no integrity or availability consequence. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with any valid SimpleChat account issues sequential GET requests to /api/user/info/1, /api/user/info/2, etc., iterating over numeric or UUID user identifiers to harvest the full user directory - collecting email addresses and display names for every registered user. No special tooling is required beyond a browser developer console or a simple script using the attacker's session cookie. … |
| Remediation | Upgrade to Microsoft SimpleChat version 0.241.203 or later, which introduces object-level authorization checks on the affected user info and profile-image endpoints. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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