CVE-2026-66750

MEDIUM 4.3

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

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-862
Vendor	sdelements
Product	lets-chat
Published	Jul 28, 2026
Last Updated	Jul 28, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Affected Versions

sdelements / lets-chat

0.3.0 ≤ 0.4.8 55e8833974c83559ed2cbc12bc15febeb2466254 ≤ 617207ff3c0c0bf8e3c7a915bd9ec03f1dd8390c

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/theopaid/Insufficient-Access-Controls-Allow-for-Unauthorized-File-Downloads-Let-s-Chat- vulncheck.com: https://www.vulncheck.com/advisories/let-s-chat-broken-access-control-file-disclosure-via-get-files-route

Credits

Theodosis Paidakis