Quick answers
- Is CVE-2026-54027 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-54027 being exploited in the wild.
- How severe is CVE-2026-54027?
- Medium severity, with a CVSS score of 6.5, published 25 June 2026.
- Which products and versions are affected?
- LibreChat < 0.8.4-rc1.
- Is there a fix for CVE-2026-54027?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-54027 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-54027?
- Check whether you run LibreChat at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A missing authorization check in the 'POST /api/files/images' endpoint allows authenticated users to upload files to any agent's 'tool_resources' (such as context or execute_code) regardless of ownership. While a previous security patch implemented permission checks for the general '/api/files' route, the image-specific route was overlooked and continues to call 'processAgentFileUpload' without verifying if the requester has EDIT permissions for the target 'agent_id'. An attacker can exploit this to inject arbitrary files into a victim's agent configuration, leading to resource pollution or manipulation of the agent's operational context. The vulnerability is addressed in version 0.8.4-rc1.
Affected products
- danny-avila LibreChat < 0.8.4-rc1
Timeline
- 2026-06-02: advisory: GitHub Security Advisory published
- 2026-06-25: disclosed: NVD publication date