Let's Chat 0.3.0 - 0.4.8 Broken Access Control File Disclosure via GET /files route
33Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 5.3epss 0.3%
from disclosure to weapon0 days
Published on NVDJul 28
1st PoCJul 26
exploitation probability
0.3%top 82% of all CVEs
observed exploitation
nono source reports it
2 public exploit(s)
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.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Affected products
sdelements · lets-chatpublic PoCs found — 2
githubgithub.com/theopaid/CVE-2026-66750-Insufficient-Access-Controls-Allow-for-Unauthorized-File-Downloads-Let-s-Chat-★ 0cve_referencegithub.com/theopaid/Insufficient-Access-Controls-Allow-for-Unauthorized-File-Downloads-Let-s-Chat-unverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.