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TI-2025-40882 Aliases CVE-2025-66450

LibreChat JSON Injection in Chat POST Allows Remote Resource Inclusion and PXSS via Image Upload

Priority HIGH 70CWE-80Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-80.

Summary

LibreChat is a ChatGPT clone with additional features. In versions 0.8.0 and below, when a user posts a question, the iconURL parameter of the POST request can be modified by an attacker. The malicious code is then stored in the chat which can then be shared to other users. When sharing chats with a potentially malicious “tracker”, resources loaded can lead to loss of privacy for users who view the chat link that is sent to them. This issue is fixed in version 0.8.1.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00213 11th percentileScored 2026-11-08
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed LibreChat (danny-avila): 0.8.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
danny-avilaLibreChatbefore 0.8.10.8.1Patch availableCNA
  • LibreChat Vendordanny-avila Affected before 0.8.1 Fixed in 0.8.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:librechat:librechat:*:*:*:*:*:*:*:*before 0.8.1Vulnerabledanny-avila
  • cpe:2.3:a:librechat:librechat:*:*:*:*:*:*:*:* Versions before 0.8.1 Vulnerable ·danny-avila

Remediation

  • Fix · CNA LibreChat (danny-avila) Fixed in 0.8.1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-66450

References

Exploit 1

Patch 1

  • TI-2026-25134 LibreChat Exfiltrates Server Secrets via MCP Server URL Injection CVSS 3.1CRITICAL 9.6
  • TI-2026-17862 LibreChat MCP Stdio Remote Command Execution CVSS 3.1CRITICAL 9.9
  • TI-2026-38976 LibreChat: Missing Resource Parameter Validation in MCP OAuth Flow CVSS 3.1CRITICAL 9.3
  • TI-2024-27763 LibreChat through 0.7.4-rc1 has incorrect access control for message updates. CVSS 3.1CRITICAL 9.8
  • TI-2024-10347 Path Traversal in danny-avila/librechat CVSS 3.0HIGH 8.8
  • TI-2026-25682 In LibreChat 0.8.1-rc2, a logged-in user obtains a JWT for both the LibreChat API and the RAG API. CVSS 3.1CRITICAL 9.0
See all 50 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences