# CVE-2026-57205: Microsoft SimpleChat IDOR in user profile endpoints

Source: https://junglewise.ai/threats/cve-2026-57205-microsoft-simplechat-idor-in-user-profile-endpoints  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-16. Updated: 2026-07-16  
License: CC BY 4.0 with a link back

CVE-2026-57205 · Severity: medium · CVSS 4.3 · Published 2026-07-16

Microsoft SimpleChat, an AI conversation platform for document-based collaboration, contained a security flaw that allowed users to view private profile information of other users. By manipulating web requests, an authenticated user could access the email addresses, display names, and profile images of colleagues without permission. This could lead to unauthorized data collection and privacy violations within an organization.

Technologies: [Microsoft SimpleChat](https://junglewise.ai/threats/technologies/simplechat). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-57205 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-57205 being exploited in the wild.

**How severe is CVE-2026-57205?** Medium severity, with a CVSS score of 4.3, published 16 July 2026.

**Which products and versions are affected?** Microsoft SimpleChat < 0.241.203.

**Is there a fix for CVE-2026-57205?** A patch was published on 2026-06-25: Version 0.250.001 released containing the fix Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-57205 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-57205?** Check whether you run Microsoft SimpleChat at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An Insecure Direct Object Reference (IDOR) vulnerability exists in the GET /api/user/info/<user_id> and GET /api/user/profile-image/<user_id> endpoints within 'application/single_app/route_backend_users.py'. The application failed to perform object-level authorization checks after verifying the caller's authentication status. An attacker with low-level authenticated access could provide a target user's Entra object ID to retrieve their Cosmos DB user-settings document, exposing email addresses, display names, and profile images. The issue is resolved in version 0.241.203 by implementing an authorization boundary that restricts profile access to the user themselves, administrators, or verified collaborators.

## Affected products

- Microsoft SimpleChat < 0.241.203

## Timeline

- 2026-06-17: advisory: GitHub Security Advisory published
- 2026-06-25: patched: Version 0.250.001 released containing the fix
- 2026-07-16: disclosed: CVE-2026-57205 published to NVD

## References

- [https://github.com/microsoft/simplechat/blob/main/docs/explanation/fixes/USER_PROFILE_IDOR_AUTHORIZATION_FIX.md](https://github.com/microsoft/simplechat/blob/main/docs/explanation/fixes/USER_PROFILE_IDOR_AUTHORIZATION_FIX.md)
- [https://github.com/microsoft/simplechat/releases/tag/v0.250.001](https://github.com/microsoft/simplechat/releases/tag/v0.250.001)
- [https://github.com/microsoft/simplechat/security/advisories/GHSA-x2jq-2m5m-65m4](https://github.com/microsoft/simplechat/security/advisories/GHSA-x2jq-2m5m-65m4)

## Related threats

- [SimpleChat stored XSS in group document filename](https://junglewise.ai/threats/cve-2026-105798-simplechat-is-a-secure-ai-conversation-application-with-personal)
- [SimpleChat authorization ordering flaw in MCP plugins](https://junglewise.ai/threats/cve-2026-105797-simplechat-is-a-secure-ai-conversation-application-with-personal)
- [Microsoft SimpleChat missing authentication in plugin validation endpoints](https://junglewise.ai/threats/cve-2026-57206-microsoft-simplechat-missing-authentication-in-plugin-validation)