CVE-2026-66750-Insufficient-Access-Controls-Allow-for-Unauthorized-File-Downloads-Let-s-Chat-

Security Advisory: Insufficient Access Controls Allow for Unauthorized File Downloads Let's Chat Assigned CVE ID: CVE-2026-66750 Summary GET /files/:id/:name checks that the caller is logged in and then serves the file. It never checks whether the caller is allowed to see the room the file belong...

CVE-2026-66751-Insufficient-Access-Controls-Allow-for-Unauthorized-Room-Deletion-Let-s-Chat-

Security Advisory: Insufficient Access Controls Allow for Unauthorized Room Deletion Let's Chat Assigned CVE ID: CVE-2026-66751 Summary DELETE /rooms/:room performs no authorization check beyond requiring a login. Any account can archive any room on the server, including private, password protect...

CVE-2026-66749-Unchecked-Room-Lookup-Leads-to-Server-Crash-Let-s-Chat-

Security Advisory: Unchecked Room Lookup Leads to Server Crash Let's Chat Assigned CVE ID: CVE-2026-66749 Summary One HTTP request from any logged-in account shuts down the Let's Chat server process. GET /messages takes a room parameter, looks that room up by id, and then calls a method on the...

CVE-2026-66751

Let's Chat 0.3.0 through 0.4.8 contains an improper authorization vulnerability that allows any authenticated user to archive any room on the server by sending a DELETE request to the rooms handler without ownership verification. Attackers can enumerate room IDs via the rooms listing endpoint and...

CVE-2026-66750

Let's Chat 0.3.0 through 0.4.8 contains a broken access control vulnerability that allows authenticated attackers to download file attachments from private and password-protected rooms they are not a member of by exploiting missing room membership checks in the file retrieval route. Attackers can...

CVE-2026-66749

Let's Chat 0.4.0 through 0.4.8 contains a null dereference vulnerability that allows authenticated attackers to crash the server by supplying a valid 24-character hex string room parameter that matches no document in the database. Attackers can send a crafted GET /messages request causing an...

CVE-2026-66750: Missing Authorization

Let's Chat 0.3.0 through 0.4.8 contains a broken access control vulnerability that allows authenticated attackers to download file attachments from private and password-protected rooms they are not a member of by exploiting missing room membership checks in the file retrieval route. Attackers can...

CVE-2026-66751: Missing Authorization

Let's Chat 0.3.0 through 0.4.8 contains an improper authorization vulnerability that allows any authenticated user to archive any room on the server by sending a DELETE request to the rooms handler without ownership verification. Attackers can enumerate room IDs via the rooms listing endpoint and...

CVE-2026-66749: NULL Pointer Dereference

Let's Chat 0.4.0 through 0.4.8 contains a null dereference vulnerability that allows authenticated attackers to crash the server by supplying a valid 24-character hex string room parameter that matches no document in the database. Attackers can send a crafted GET /messages request causing an...