SEPTEMBER 15, 2026
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Case File

CVE-2026-55235

MEDIUM · CVSS 5.9 Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-14 · Last synced 2026-09-15

CyberRota Analysis

AI-Generated

The langgraph-api prior to version 0.10.0 is vulnerable due to its handling of webhook targets, allowing authenticated users to exploit the in-process loopback transport to manipulate other users' threads. This could lead to unauthorized creation or modification of runs, compromising user data integrity and privacy. Organizations using langgraph-api should prioritize upgrading to version 0.10.0 to mitigate potential risks associated with this vulnerability.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-55235
Severity
MEDIUM
CVSS
5.9
EPSS
N/A

Original NVD Description

langgraph-api implements the LangGraph API for rapid development and testing. Prior to 0.10.0, langgraph-api permits a run or cron to specify a relative webhook target that is delivered through an in-process loopback transport, and the authentication middleware treats that transport as internal without applying the authentication context used for external requests. In deployments that rely on per-user authorization to separate threads and runs, an authenticated user can direct a webhook to the server's own thread and run routes, allowing creation of a run on or modification of another user's thread and limited incorporation of the targeted thread's metadata into the created run record. The affected path requires webhook targets and per-user authorization boundaries; deployments that deliberately re-enable loopback delivery should restrict it to controlled same-process routes because those webhooks remain unauthenticated. This issue is fixed in version 0.10.0.