CVE-2026-82906 sdcb chats Signed File Download Endpoint FileController.cs DownloadPublic missing authentication
Remote attackers can access signed file download endpoints without authentication, potentially exposing sensitive chat files.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-82906?
CVE-2026-82906 is a medium-severity missing authorization vulnerability in sdcb chats, published on 31 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A flaw has been found in sdcb chats up to 1.12.0. This impacts the function DownloadPublic of the file src/BE/web/Controllers/Chats/Files/FileController.cs of the component Signed File Download Endpoint. This manipulation causes missing authentication. Remote exploitation of the attack is possible. The attack's complexity is rated as high. The exploitability is said to be difficult. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Which versions are affected by CVE-2026-82906?
How do I fix CVE-2026-82906?
No fix has been published for CVE-2026-82906 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-82906 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-82906 exists.
Sources
Also known as GHSA-mhgp-xhpx-jf66.