How broadly exploitable is this vulnerability?

Exploitation is feasible wherever attackers can register on the same LibreChat instance and send crafted OAuth authorization URLs to victims. The attack works over the network and can be launched via phishing, chat messages, or other social-engineering channels.

Does an attacker need direct access to the victim's LibreChat account?

No. The attacker needs their own LibreChat account and a victim who completes the OAuth authorization flow via a malicious link. The core issue is that the callback binds the victim's tokens to the attacker's account without verifying the user/session.

What is the safest general fix pattern for developers?

Always authenticate and identify the user at the OAuth callback, then verify that this user is the same party who initiated the flow. Use server-side `state` or correlation tokens bound to the user's session and reject any callback that does not match the expected session and user identity.

Severity:

HIGH RISK

(7.6)

Missing Authentication for OAuth Callback Binding (CWE-306) in LibreChat MCP Integration

CVE-2026-31944

Published:

Mar 13, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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Vulnerability Type

Category:

Missing Authentication / Session Binding in OAuth Flows

CWE:

CWE-306

Impact:

Account Takeover of Linked Third-Party Services

Severity:

HIGH RISK

(7.6)

CVSS Version:

3.1

Vulnerability Type

Category:

Missing Authentication / Session Binding in OAuth Flows

CWE:

CWE-306

Impact:

Account Takeover of Linked Third-Party Services

Severity:

HIGH RISK

(7.6)

CVSS Version:

3.1

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Missing Authentication for OAuth Callback Binding (CWE-306) in LibreChat MCP Integration

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(8.6)

Server-Side Request Forgery (CWE-918) in OpenClaw Zalo Plugin sendPhoto

HIGH RISK

HIGH

(8.8)

Authorization Bypass (CWE-863) in OpenClaw Matrix Room Control Commands

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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