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Medium · 4.3 Public exploit CVE-2026-66750 EUVD-2026-49876GHSA-mf6v-fwp6-46g3

Let's Chat 0.3.0 - 0.4.8 Broken Access Control File Disclosure via GET /files route

Published Jul 28, 2026 · Updated Jul 28, 2026 · Assigned by VulnCheck

Vendor: sdelements Product: lets-chat

Description

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 enumerate adjacent MongoDB ObjectIds derived from a known file ID to recover files uploaded by other users, as the GET /files/:id/:name route in app/controllers/files.js only enforces login authentication without consulting room membership or the Room.canJoin check.

Affected products

VendorProductAffectedFixed
sdelements lets-chat 0.3.0 – ≤ 0.4.8 —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

References