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TI-2026-47398 Aliases CVE-2026-66750GHSA-mf6v-fwp6-46g3

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

Priority MEDIUM 57CWE-862Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
Low · None · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-862.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00346 28th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
sdelementslets-chat0.3.0 – 0.4.8—No fix listedCNA
  • lets-chat Vendorsdelements Affected 0.3.0 – 0.4.8 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-66750
  2. 2026-10-03 Alias added: GHSA-mf6v-fwp6-46g3

References

Exploit 1

  • TI-2026-47399 Let's Chat 0.3.0 - 0.4.8 Improper Authorization via DELETE /rooms/:room CVSS 4.0MEDIUM 5.3
  • TI-2026-47397 Let's Chat 0.4.0 - 0.4.8 Denial of Service via Null Dereference in Room Lookup CVSS 4.0HIGH 7.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences