CVE-2026-44895
GitLab MCP Server: SSE transport has no authentication and wildcard CORS, exposing all GitLab tools
Description
GitLab MCP Server lets an AI agent talk directly to GitLab. Prior to 0.6.0, the HTTP transport in src/transport.ts ships with no authentication layer at all and a wildcard Access-Control-Allow-Origin: * on every response. The structural defect is that the SSE server stands up a stateful, mutation-capable RPC endpoint that is backed by the operator's GITLAB_PERSONAL_ACCESS_TOKEN without any inbound credential check, then advertises itself to every cross-origin browser context via the wildcard CORS header. The httpServer.listen(port) call at line 97 also passes no host argument, so the bind defaults to 0.0.0.0 and exposes the auth-less surface on every interface. This vulnerability is fixed in 0.6.0.
INFO
Published Date :
May 26, 2026, 10:16 p.m.
Last Modified :
July 24, 2026, 11:10 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-44895
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 4.0 | CRITICAL | [email protected] |
Solution
- Update GitLab MCP Server to version 0.6.0 or later.
- Configure proper authentication for the SSE server.
- Restrict access to the RPC endpoint.
Public PoC/Exploit Available at Github
CVE-2026-44895 has a 2 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-2026-44895.
| URL | Resource |
|---|---|
| https://github.com/yoda-digital/mcp-gitlab-server/security/advisories/GHSA-8jr5-6gvj-rfpf | |
| https://github.com/yoda-digital/mcp-gitlab-server/security/advisories/GHSA-8jr5-6gvj-rfpf |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-44895 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-2026-44895
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
Static scanner for MCP-connected AI agent pipelines — 225 rules across 11 categories, 12 compliance frameworks, OWASP Agentic 10/10 + MCP 10/10, GitHub Action, SARIF, public CVE-to-rule ledger.
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Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-44895 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-44895 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 Translated by [email protected]
Jul. 24, 2026
Action Type Old Value New Value Changed Translation Title: GitLab MCP Server, Description: GitLab MCP Server permite que un agente de IA se comunique directamente con GitLab. Antes de la versión 0.6.0, el transporte HTTP en src/transport.ts se envía sin ninguna capa de autenticación y con un comodín Access-Control-Allow-Origin: * en cada respuesta. El defecto estructural es que el servidor SSE establece un endpoint RPC con estado y capacidad de mutación que está respaldado por el GITLAB_PERSONAL_ACCESS_TOKEN del operador sin ninguna verificación de credenciales entrantes, luego se anuncia a cada contexto de navegador de origen cruzado a través del encabezado CORS comodín. La llamada a httpServer.listen(port) en la línea 97 tampoco pasa ningún argumento de host, por lo que el enlace se establece por defecto en 0.0.0.0 y expone la superficie sin autenticación en cada interfaz. Esta vulnerabilidad se corrige en la versión 0.6.0. Title: GitLab MCP Server, Description: GitLab MCP Server permite que un agente de IA se comunique directamente con GitLab. Antes de la versión 0.6.0, el transporte HTTP en src/transport.ts se envía sin ninguna capa de autenticación y con un comodín Access-Control-Allow-Origin: * en cada respuesta. El defecto estructural es que el servidor SSE establece un endpoint RPC con estado y capacidad de mutación que está respaldado por el GITLAB_PERSONAL_ACCESS_TOKEN del operador sin ninguna verificación de credenciales entrantes, luego se anuncia a cada contexto de navegador de origen cruzado a través del encabezado CORS comodín. La llamada a httpServer.listen(port) en la línea 97 tampoco pasa ningún argumento de host, por lo que el enlace se establece por defecto en 0.0.0.0 y expone la superficie sin autenticación en cada interfaz. Esta vulnerabilidad se corrige en la versión 0.6.0. -
CVE Translated by [email protected]
Jul. 23, 2026
Action Type Old Value New Value Added Translation Title: GitLab MCP Server, Description: GitLab MCP Server permite que un agente de IA se comunique directamente con GitLab. Antes de la versión 0.6.0, el transporte HTTP en src/transport.ts se envía sin ninguna capa de autenticación y con un comodín Access-Control-Allow-Origin: * en cada respuesta. El defecto estructural es que el servidor SSE establece un endpoint RPC con estado y capacidad de mutación que está respaldado por el GITLAB_PERSONAL_ACCESS_TOKEN del operador sin ninguna verificación de credenciales entrantes, luego se anuncia a cada contexto de navegador de origen cruzado a través del encabezado CORS comodín. La llamada a httpServer.listen(port) en la línea 97 tampoco pasa ningún argumento de host, por lo que el enlace se establece por defecto en 0.0.0.0 y expone la superficie sin autenticación en cada interfaz. Esta vulnerabilidad se corrige en la versión 0.6.0. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'yoda-digital', 'product': 'mcp-gitlab-server', 'versions': [{'status': 'affected', 'version': '< 0.6.0'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-44895', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-05-27T13:34:54.695835Z'} -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
May. 27, 2026
Action Type Old Value New Value Added Reference https://github.com/yoda-digital/mcp-gitlab-server/security/advisories/GHSA-8jr5-6gvj-rfpf -
New CVE Received by [email protected]
May. 26, 2026
Action Type Old Value New Value Added Description GitLab MCP Server lets an AI agent talk directly to GitLab. Prior to 0.6.0, the HTTP transport in src/transport.ts ships with no authentication layer at all and a wildcard Access-Control-Allow-Origin: * on every response. The structural defect is that the SSE server stands up a stateful, mutation-capable RPC endpoint that is backed by the operator's GITLAB_PERSONAL_ACCESS_TOKEN without any inbound credential check, then advertises itself to every cross-origin browser context via the wildcard CORS header. The httpServer.listen(port) call at line 97 also passes no host argument, so the bind defaults to 0.0.0.0 and exposes the auth-less surface on every interface. This vulnerability is fixed in 0.6.0. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/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 CWE CWE-306 Added CWE CWE-942 Added Reference https://github.com/yoda-digital/mcp-gitlab-server/security/advisories/GHSA-8jr5-6gvj-rfpf