CVE-2026-54027: LibreChat is an enhanced ChatGPT clone that supports multiple AI providers

Q: How do I fix CVE-2026-54027?

librechat: upgrade to newer than 0.8.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-54027 being exploited?

CVE-2026-54027 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-54027 affect?

CVE-2026-54027 affects librechat. Severity is medium (CVSS 6.5). LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the POST /api/files/images endpoint allows any authenticated user to upload files into any agent's tool_resources (e.g., context, execute_code)

Q: How urgent is CVE-2026-54027?

Priority 34/100. Public exploit reference

Routine

MEDIUM 6.5UPGRADE

CVE-2026-54027 is a medium-severity flaw (CVSS 6.5) affecting librechat. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the POST /api/files/images endpoint allows any authenticated user to upload files into any agent's tool_resources (e.g., context, execute_code) without verifying ownership or EDIT permission on the target agent. A permission check was added to the POST /api/files route in a previous patch, but the image upload route was never updated with the same chec

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 75%)
CISA exploited list	No
Weakness	CWE-862
Published	2026-06-25
Last modified	2026-10-25

Publisher (CNA): GitHub, Inc. · Vendor: librechat

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-25 17:16 UTCPublished CVE record published
2026-10-25 22:10 UTCUpdated Record last modified

librechat librechat UPGRADE

Affected: <= 0.8.3

Fixed in: newer than 0.8.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy librechat || rpm -q librechat || librechat --version

2. UPGRADE to newer than 0.8.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade librechat

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade librechat

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-54027?

librechat: upgrade to newer than 0.8.3. Exact commands for each OS are on this page.

Is CVE-2026-54027 being exploited?

CVE-2026-54027 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-54027 affect?

CVE-2026-54027 affects librechat. Severity is medium (CVSS 6.5). LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the POST /api/files/images endpoint allows any authenticated user to upload files into any agent's tool_resources (e.g., context, execute_code)

How urgent is CVE-2026-54027?

Priority 34/100. Public exploit reference

Software pages

OpenAI ChatGPT vulnerabilities

Related CVEs

CVE-2026-54033 HIGH 7.7 UPGRADE LibreChat is an enhanced ChatGPT clone that supports multiple AI providers
CVE-2026-54037 MEDIUM 6.5 UPGRADE LibreChat is an enhanced ChatGPT clone that supports multiple AI providers
CVE-2026-54024 MEDIUM 6.5 UPGRADE LibreChat is an enhanced ChatGPT clone that supports multiple AI providers
CVE-2026-54030 HIGH 8.0 UPGRADE LibreChat is an enhanced ChatGPT clone that supports multiple AI providers
CVE-2026-54036 MEDIUM 5.3 UPGRADE LibreChat is an enhanced ChatGPT clone that supports multiple AI providers

References

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