CVE-2026-66750 | Let's Chat 0.3.0 through 0.4.8 contains a broken access cont… | CVSS 4.3 MEDIUM

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.

Metadata

CVE ID: CVE-2026-66750
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-07-27 16:27 UTC
Published: 2026-07-28 15:33 UTC
Last updated: 2026-07-28 17:07 UTC
Primary CWE: CWE-862
Missing Authorization
Vendor / Product: sdelements / lets-chat
Sources: cve.org · NVD

Severity & Metrics

4.3 MEDIUM CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: no
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
sdelements	lets-chat	—	0.3.0 ≤ 0.4.8, 55e8833974c83559ed2cbc12bc15febeb2466254 ≤ 617207ff3c0c0bf8e3c7a915bd9ec03f1dd8390c

Weakness (CWE)

CWE	Source	Description
CWE-862	cna	Missing Authorization

CVSS scores (2)

Score	Severity	Version	Source	Vector
5.3	MEDIUM	4.0	cna	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
4.3	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References (2)