CVE-2026-12773
BerriAI litellm MCP Proxy user_api_key_auth_mcp.py UserAPIKeyAuth improper authentication
Description
A weakness has been identified in BerriAI litellm up to 1.59.8. Affected is the function UserAPIKeyAuth of the file litellm/proxy/_experimental/mcp_server/auth/user_api_key_auth_mcp.py of the component MCP Proxy. Executing a manipulation can lead to improper authentication. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure.
INFO
Published Date :
June 21, 2026, 4:16 a.m.
Last Modified :
July 15, 2026, 2:18 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 2.0 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 3.1 | HIGH | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update litellm to version 1.59.9 or later.
- Apply vendor patches or updates promptly.
Public PoC/Exploit Available at Github
CVE-2026-12773 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-12773.
| URL | Resource |
|---|---|
| https://gist.github.com/YLChen-007/3cfaad10a69d7a15e4d4d458cb53309e | Exploit Third Party Advisory |
| https://vuldb.com/cve/CVE-2026-12773 | Third Party Advisory VDB Entry |
| https://vuldb.com/submit/811282 | Exploit Third Party Advisory VDB Entry |
| https://vuldb.com/vuln/372515 | Third Party Advisory VDB Entry |
| https://vuldb.com/vuln/372515/cti | Permissions Required VDB Entry |
| https://access.redhat.com/security/cve/CVE-2026-12773 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2491112 | |
| https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12773.json | |
| https://vuldb.com/submit/811282 | Exploit Third Party Advisory VDB Entry |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-12773 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-12773
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
The Project shares all information on MCP related CVE's published
mcp mcp-security mcp-cve
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-12773 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-12773 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jul. 15, 2026
Action Type Old Value New Value Changed Affected [{'cpes': ['cpe:/a:redhat:exploit_intelligence:0'], 'vendor': 'Red Hat', 'product': 'Exploit Intelligence', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:ansible_automation_platform:2'], 'vendor': 'Red Hat', 'product': 'Red Hat Ansible Automation Platform 2', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift_ai'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI (RHOAI)', 'defaultStatus': 'unaffected'}] [{'cpes': ['cpe:/a:redhat:exploit_intelligence:0'], 'vendor': 'Red Hat', 'product': 'Exploit Intelligence', 'packageName': 'exploit-intelligence-tech-preview/vulnerability-analysis-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:ansible_automation_platform:2'], 'vendor': 'Red Hat', 'product': 'Red Hat Ansible Automation Platform 2', 'packageName': 'ansible-automation-platform-26/lightspeed-chatbot-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:ansible_automation_platform:2'], 'vendor': 'Red Hat', 'product': 'Red Hat Ansible Automation Platform 2', 'packageName': 'ansible-automation-platform-27/lightspeed-chatbot-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift_ai'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI (RHOAI)', 'packageName': 'rhoai/odh-llama-stack-core-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift_ai'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI (RHOAI)', 'packageName': 'rhoai/odh-mlflow-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift_ai'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI (RHOAI)', 'packageName': 'rhoai/odh-trustyai-garak-lls-provider-dsp-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}] -
CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jun. 30, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:/a:redhat:exploit_intelligence:0'], 'vendor': 'Red Hat', 'product': 'Exploit Intelligence', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:ansible_automation_platform:2'], 'vendor': 'Red Hat', 'product': 'Red Hat Ansible Automation Platform 2', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift_ai'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI (RHOAI)', 'defaultStatus': 'unaffected'}] Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L Added CWE CWE-303 Added Reference https://access.redhat.com/security/cve/CVE-2026-12773 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2491112 Added Reference https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12773.json -
Initial Analysis by [email protected]
Jun. 24, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CPE Configuration OR *cpe:2.3:a:litellm:litellm:*:*:*:*:*:*:*:* versions up to (excluding) 1.59.9 Added Reference Type VulDB: https://gist.github.com/YLChen-007/3cfaad10a69d7a15e4d4d458cb53309e Types: Exploit, Third Party Advisory Added Reference Type VulDB: https://vuldb.com/cve/CVE-2026-12773 Types: Third Party Advisory, VDB Entry Added Reference Type VulDB: https://vuldb.com/submit/811282 Types: Exploit, Third Party Advisory, VDB Entry Added Reference Type VulDB: https://vuldb.com/vuln/372515 Types: Third Party Advisory, VDB Entry Added Reference Type VulDB: https://vuldb.com/vuln/372515/cti Types: Permissions Required, VDB Entry Added Reference Type CISA-ADP: https://vuldb.com/submit/811282 Types: Exploit, Third Party Advisory, VDB Entry -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 22, 2026
Action Type Old Value New Value Added Reference https://vuldb.com/submit/811282 Added SSVC {'id': 'CVE-2026-12773', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-22T17:55:49.325110Z'} -
New CVE Received by [email protected]
Jun. 21, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:2.3:a:litellm:litellm:*:*:*:*:*:*:*:*'], 'vendor': 'BerriAI', 'modules': ['MCP Proxy'], 'product': 'litellm', 'versions': [{'status': 'affected', 'version': '1.59.0'}, {'status': 'affected', 'version': '1.59.1'}, {'status': 'affected', 'version': '1.59.2'}, {'status': 'affected', 'version': '1.59.3'}, {'status': 'affected', 'version': '1.59.4'}, {'status': 'affected', 'version': '1.59.5'}, {'status': 'affected', 'version': '1.59.6'}, {'status': 'affected', 'version': '1.59.7'}, {'status': 'affected', 'version': '1.59.8'}]}] Added Description A weakness has been identified in BerriAI litellm up to 1.59.8. Affected is the function UserAPIKeyAuth of the file litellm/proxy/_experimental/mcp_server/auth/user_api_key_auth_mcp.py of the component MCP Proxy. Executing a manipulation can lead to improper authentication. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L Added CVSS V2 (AV:N/AC:L/Au:N/C:P/I:P/A:P) Added CWE CWE-287 Added Reference https://gist.github.com/YLChen-007/3cfaad10a69d7a15e4d4d458cb53309e Added Reference https://vuldb.com/cve/CVE-2026-12773 Added Reference https://vuldb.com/submit/811282 Added Reference https://vuldb.com/vuln/372515 Added Reference https://vuldb.com/vuln/372515/cti