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CVE-2026-18990: Missing Authentication in letta-ai LettaBot

0
Medium
VulnerabilityCVE-2026-18990cvecve-2026-18990
Published: 08/06/2026 (08/06/2026, 02:15:08 UTC)
Source: CVE Database V5
Vendor/Project: letta-ai
Product: LettaBot

Description

CVE-2026-18990 is a medium severity vulnerability in letta-ai LettaBot version 0.2.0 where an API Status Route in src/api/server.ts lacks proper authentication. This allows remote attackers to access functionality without authentication. Exploit code is publicly available, but no official vendor response or patch has been provided.

CVSS v4.0

Score 6.9medium

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Vuln. Confidentiality
Low
Vuln. Integrity
Low
Vuln. Availability
Low
Subsq. Confidentiality
None
Subsq. Integrity
None
Subsq. Availability
None
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

Affected software

Affected versions
=0.2.0
CPE configurations
cpe:2.3:a:letta-ai:lettabot:*:*:*:*:*:*:*:*

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 08/06/2026, 12:52:44 UTC

Technical Analysis

The vulnerability in letta-ai LettaBot 0.2.0 involves missing authentication in an unspecified function within the API Status Route component (src/api/server.ts). This flaw enables remote attackers to bypass authentication controls. The issue has been publicly disclosed with exploit code available. The vendor was notified but has not issued any response or remediation guidance. No official patch or fix is currently documented.

Potential Impact

Remote attackers can exploit the missing authentication to access the affected API route without credentials, potentially leading to unauthorized information disclosure or manipulation depending on the API functionality. The CVSS 4.0 base score is 6.9 (medium severity), reflecting network attack vector, no privileges or user interaction required, and low to limited confidentiality, integrity, and availability impacts.

Mitigation Recommendations

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since the vendor has not responded or released a fix, users should consider implementing compensating controls such as restricting network access to the API, adding external authentication proxies, or monitoring for suspicious access until an official patch is available.

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Technical Details

Data Version
5.2
Assigner Short Name
VulDB
Date Reserved
2026-08-05T18:44:22.650Z
Cvss Version
4.0
State
PUBLISHED
Remediation Level
null

Threat ID: 6a748377bf8831d539b8c69d

Added to database: 08/06/2026, 12:52:07 UTC

Last enriched: 08/06/2026, 12:52:44 UTC

Last updated: 08/06/2026, 13:17:44 UTC

Views: 5

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