CVE-2026-66750

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreHIGH confidence

Score 4.3 from GitHub Security Advisory published 2026-07-28. a secondary CVSS source baseline 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.3Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
4.3
EG Score
4.3(high)
EG Risk
35(Track)
EG Risk 35/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity43% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
18%
KEV
Not listed

Published

July 28, 2026

Last Modified

July 30, 2026

Advisory Details (2)

Auto-updated Jul 28, 2026
No patch confirmed yet.
generic

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

https://www.vulncheck.com/advisories/let-s-chat-broken-access-control-file-disclosure-via-get-files-route
generic

GitHub - theopaid/Insufficient-Access-Controls-Allow-for-Unauthorized-File-Downloads-Let-s-Chat-: Security Advisory: Insufficient Access Controls Allow for Unauthorized File Downloads (Let's Chat) · GitHub

https://github.com/theopaid/Insufficient-Access-Controls-Allow-for-Unauthorized-File-Downloads-Let-s-Chat-

Vendor Advisories for CVE-2026-66750(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 21× in last 7d / 21× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-03 16:27 UTCEG score recompute
  2. 2026-08-03 16:27 UTCGHSA enrichment
  3. 2026-08-03 10:36 UTCEPSS rescore
  4. 2026-08-02 16:32 UTCEG score recompute
  5. 2026-08-02 16:32 UTCGHSA enrichment
  6. 2026-08-02 02:27 UTCEPSS rescore
  7. 2026-08-01 16:37 UTCEG score recompute
  8. 2026-08-01 16:37 UTCGHSA enrichment
  9. 2026-08-01 04:16 UTCEPSS rescore
  10. 2026-07-31 16:42 UTCGHSA enrichment
  11. 2026-07-30 16:45 UTCEG score recompute
  12. 2026-07-30 16:45 UTCGHSA enrichment
  13. 2026-07-30 16:28 UTCEPSS rescore
  14. 2026-07-30 01:30 UTCEPSS rescore
  15. 2026-07-29 18:21 UTCEG score recompute
  16. 2026-07-29 18:21 UTCGHSA enrichment
  17. 2026-07-28 18:26 UTCEG score recompute
  18. 2026-07-28 17:26 UTCEG score recompute
  19. 2026-07-28 16:40 UTCEG score recompute
  20. 2026-07-28 16:14 UTCEG score recompute
  21. 2026-07-28 16:13 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-66750?
CVE-2026-66750 is a medium vulnerability published on July 28, 2026. 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…
When was CVE-2026-66750 disclosed?
CVE-2026-66750 was first published in the National Vulnerability Database on July 28, 2026, with the most recent update on July 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66750 actively exploited?
CVE-2026-66750 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 81.9% of all scored CVEs.
What is the CVSS score of CVE-2026-66750?
CVE-2026-66750 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-66750?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66750, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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