What’s Vulnerable › Vulnerabilities

CVE-2025-66450: LibreChat JSON Injection in Chat POST Allows Remote Resource Inclusion and PXSS via Image Upload

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-12-11 · updated 2026-10-07
• Weakness: CWE-80

Description

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.

Affected products

• danny-avila LibreChat: before 0.8.1 — fixed in 0.8.1

How to fix

Upgrade to a fixed version: danny-avila LibreChat 0.8.1. Check the vendor advisory for mitigations.

References

• https://github.com/danny-avila/LibreChat/commit/6fa94d3eb8f5779363226d10dccf8b01a735744c
• https://github.com/danny-avila/LibreChat/security/advisories/GHSA-84vx-vmcf-xgpp

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