What is CVE-2026-66751?

CVE-2026-66751 is a medium-severity vulnerability in Sdelements Lets-Chat, classified under Missing Authorization. CVSS score: 5.4/10. Published 2026-07-28.

How severe is CVE-2026-66751?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Is CVE-2026-66751 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Sdelements Lets-Chat

CVE-2026-66751

Let's Chat 0.3.0 through 0.4.8 contains an improper authorization vulnerability that allows any authenticated user to archive any room on the server by sending a DELETE request to the rooms handler without ownership verification. Attackers can enumerate room IDs via the rooms listing endpoint and permanently archive private or password-protected rooms they cannot access, with no application-level recovery path requiring direct database intervention to restore.

Vulnerability class: Broken Access Control

EPSS: 0.002 (11.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.

Affected products

Sdelements Lets-chat — versions 0.3.0, 5b5f46f92696955c27864dbca8b33b5b6a39a502

Weakness classification (CWE)

CWE-862 — Missing Authorization

Public proof-of-concept exploits

theopaid/CVE-2026-66751-Insufficient-Access-Controls-Allow-for-Unauthorized-Room-Deletion-Let-s-Chat-

References

disclosure@vulncheck.com (technical-description, exploit)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-66751?: CVE-2026-66751 is a medium-severity vulnerability in Sdelements Lets-Chat, classified under Missing Authorization. CVSS score: 5.4/10. Published 2026-07-28.
How severe is CVE-2026-66751?: Medium severity. CVSS v3 base score is 5.4 out of 10.
Is CVE-2026-66751 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.