What is CVE-2026-18990?

CVE-2026-18990 is a high-severity vulnerability in Letta-ai Lettabot, classified under Improper Authentication. CVSS score: 7.3/10. Published 2026-08-06.

How severe is CVE-2026-18990?

High severity. CVSS v3 base score is 7.3 out of 10.

Auth bypass in Letta-ai Lettabot

CVE-2026-18990

A vulnerability was detected in letta-ai LettaBot 0.2.0. Impacted is an unknown function of the file src/api/server.ts of the component API Status Route. The manipulation results in missing authentication. The attack may be performed from…

Vulnerability class: Broken Authentication

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

Affected products

Letta-ai Lettabot — versions 0.2.0

Weakness classification (CWE)

References

cna@vuldb.com (exploit)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (vdb-entry)
cna@vuldb.com (signature, permissions-required)

Frequently asked questions

What is CVE-2026-18990?: CVE-2026-18990 is a high-severity vulnerability in Letta-ai Lettabot, classified under Improper Authentication. CVSS score: 7.3/10. Published 2026-08-06.
How severe is CVE-2026-18990?: High severity. CVSS v3 base score is 7.3 out of 10.