CVE-2026-54027

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 check. An attacker can simply use the image endpoint instead of the file endpoint to bypass the authorization entirely. This vulnerability is fixed in 0.8.4-rc1.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/danny-avila/LibreChat/security/advisories/GHSA-c55r-p24w-hcj5	Exploit Vendor Advisory
https://github.com/danny-avila/LibreChat/security/advisories/GHSA-c55r-p24w-hcj5	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:librechat:librechat:*:*:*:*:*:*:*:*

History

26 Jun 2026, 19:02

Type	Values Removed	Values Added
First Time		Librechat librechat Librechat
CPE		cpe:2.3:a:librechat:librechat::::::::
References	~~() https://github.com/danny-avila/LibreChat/security/advisories/GHSA-c55r-p24w-hcj5 -~~	() https://github.com/danny-avila/LibreChat/security/advisories/GHSA-c55r-p24w-hcj5 - Exploit, Vendor Advisory

26 Jun 2026, 16:16

Type	Values Removed	Values Added
References	~~() https://github.com/danny-avila/LibreChat/security/advisories/GHSA-c55r-p24w-hcj5 -~~	() https://github.com/danny-avila/LibreChat/security/advisories/GHSA-c55r-p24w-hcj5 -

25 Jun 2026, 17:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-25 17:16

Updated : 2026-06-26 19:02

NVD link : CVE-2026-54027

Mitre link : CVE-2026-54027

CVE.ORG link : CVE-2026-54027

JSON object : View

Products Affected

librechat

librechat

CWE

CWE-862

Missing Authorization

{"id": "CVE-2026-54027", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-54027", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-26T15:20:33.829289Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "danny-avila", "product": "LibreChat", "versions": [{"status": "affected", "version": "< 0.8.4-rc1"}]}]}], "published": "2026-06-25T17:16:40.397", "references": [{"url": "https://github.com/danny-avila/LibreChat/security/advisories/GHSA-c55r-p24w-hcj5", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/danny-avila/LibreChat/security/advisories/GHSA-c55r-p24w-hcj5", "tags": ["Exploit", "Vendor Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-862"}]}], "descriptions": [{"lang": "en", "value": "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 check. An attacker can simply use the image endpoint instead of the file endpoint to bypass the authorization entirely. This vulnerability is fixed in 0.8.4-rc1."}], "lastModified": "2026-06-26T19:02:55.917", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:librechat:librechat:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "77B80F25-E7C2-442E-98E3-F4462C40C74F", "versionEndIncluding": "0.8.3"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}