Is CVE-2026-66750 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-66750 being exploited in the wild.

How severe is CVE-2026-66750?

Medium severity, with a CVSS score of 4.3, published 28 July 2026.

Which products and versions are affected?

SD Elements Let's Chat 0.3.0 - 0.4.8.

Is there a fix for CVE-2026-66750?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-66750 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-66750?

Check whether you run SD Elements Let's Chat 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.

CVE-2026-66750: sdelements Let's Chat broken access control in file retrieval route

CVE-2026-66750 · Severity: medium · CVSS 4.3 · Published 2026-07-28

Let's Chat is a self-hosted chat application for small teams. A security flaw allows any logged-in user to download private file attachments from chat rooms they are not supposed to have access to, including password-protected or private rooms. This could lead to the unauthorized exposure of sensitive company documents or private communications shared within the platform.

Technologies: SD Elements Let's Chat. Vendors: SD Elements.

Quick answers

Is CVE-2026-66750 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-66750 being exploited in the wild.
How severe is CVE-2026-66750?: Medium severity, with a CVSS score of 4.3, published 28 July 2026.
Which products and versions are affected?: SD Elements Let's Chat 0.3.0 - 0.4.8.
Is there a fix for CVE-2026-66750?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-66750 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-66750?: Check whether you run SD Elements Let's Chat 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

A broken access control vulnerability exists in the file retrieval logic of Let's Chat versions 0.3.0 through 0.4.8. The GET /files/:id/:name route in app/controllers/files.js verifies that a user is authenticated but fails to perform authorization checks regarding room membership or the Room.canJoin status. An attacker can exploit this by predicting or enumerating MongoDB ObjectIds for files to download attachments from rooms they have not joined. This allows for unauthorized data disclosure across the entire application instance. The project was archived in late 2025, and no official patch is currently noted.

Affected products

sdelements Let's Chat 0.3.0 - 0.4.8

Timeline

2026-07-28: disclosed
2026-07-28: advisory

References

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