CVE-2026-31944

Published: Mar 13, 2026 Last Modified: Mar 17, 2026
ExploitDB:
Other exploit source:
Google Dorks:
HIGH 7,6
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: low
User Interaction: required
Scope: changed
Confidentiality: high
Integrity: low
Availability: none

Description

AI Translation Available

LibreChat is a ChatGPT clone with additional features. From 0.8.2 to 0.8.2-rc3, The MCP (Model Context Protocol) OAuth callback endpoint accepts the redirect from the identity provider and stores OAuth tokens for the user who initiated the flow, without verifying that the browser hitting the redirect URL is logged in or that the logged-in user matches the initiator. An attacker can send the authorization URL to a victim; when the victim completes the flow, the victim’s OAuth tokens are stored on the attacker’s LibreChat account, enabling account takeover of the victim’s MCP-linked services (e.g. Atlassian, Outlook). This vulnerability is fixed in 0.8.3-rc1.

EPSS (Exploit Prediction Scoring System)

Trend Analysis

EPSS (Exploit Prediction Scoring System)

Prevede la probabilità di sfruttamento basata su intelligence sulle minacce e sulle caratteristiche della vulnerabilità.

EPSS Score
0,0003
Percentile
0,1th
Updated

EPSS Score Trend (Last 4 Days)

306

Missing Authentication for Critical Function

Draft
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Access Control Other
Potential Impacts:
Gain Privileges Or Assume Identity Varies By Context
Applicable Platforms
Technologies: Cloud Computing, ICS/OT
Likelihood of Exploit: High
View CWE Details
Application

Librechat by Librechat

Product Information
Vendor Librechat
Product Librechat
Version 0.8.2
cpe:2.3:a:librechat:librechat:0.8.2:rc2:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Librechat by Librechat

Product Information
Vendor Librechat
Product Librechat
Version 0.8.2
cpe:2.3:a:librechat:librechat:0.8.2:rc3:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Librechat by Librechat

Product Information
Vendor Librechat
Product Librechat
Version 0.8.2
cpe:2.3:a:librechat:librechat:0.8.2:-:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Librechat by Librechat

Product Information
Vendor Librechat
Product Librechat
Version 0.8.2
cpe:2.3:a:librechat:librechat:0.8.2:rc1:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
https://github.com/danny-avila/LibreChat/security/advisorie…
https://github.com/danny-avila/LibreChat/security/advisories/GHSA-vf7j-7mrx-hp7g