Weakness (CWE)
CWE-306: Missing Authentication for Critical Functionality
The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
How to prevent it (5 mitigations)
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Architecture and Design
Divide the software into anonymous, normal, privileged, and administrative areas. Identify which of these areas require a proven user identity, and use a centralized authentication capability.
Identify all potential communication channels, or other means of interaction with the software, to ensure that all channels are appropriately protected, including those channels that are assumed to be accessible only by authorized parties. Developers sometimes perform authentication at the primary channel, but open up a secondary channel that is assumed to be private. For example, a login mechanism may be listening on one network port, but after successful authentication, it may open up a second port where it waits for the connection, but avoids authentication because it assumes that only the authenticated party will connect to the port.
In general, if the software or protocol allows a single session or user state to persist across multiple connections or channels, authentication and appropriate credential management need to be used throughout.
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Architecture and Design
For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
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Architecture and Design
Where possible, avoid implementing custom, "grow-your-own" authentication routines and consider using authentication capabilities as provided by the surrounding framework, operating system, or environment. These capabilities may avoid common weaknesses that are unique to authentication; support automatic auditing and tracking; and make it easier to provide a clear separation between authentication tasks and authorization tasks.
In environments such as the World Wide Web, the line between authentication and authorization is sometimes blurred. If custom authentication routines are required instead of those provided by the server, then these routines must be applied to every single page, since these pages could be requested directly.
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Architecture and Design
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
For example, consider using libraries with authentication capabilities such as OpenSSL or the ESAPI Authenticator [REF-45].
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Implementation, System Configuration, Operation
When storing data in the cloud (e.g., S3 buckets, Azure blobs, Google Cloud Storage, etc.), use the provider's controls to require strong authentication for users who should be allowed to access the data [REF-1297] [REF-1298] [REF-1302].
Source: MITRE CWE-306
1,266 results · Clear filters · Feed
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High 7.5
free5GC: SMF UPI POST /upi/v1/upNodesLinks exits the SMF process on overlapping UE pools (unauthenticated, reachable Fatalf)
free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's SMF mounts the UPI management route group without inbound OAuth2 middleware. The POST /upi/v1/upNodesLinks create-or-update handler accepts attacker-controlled JSON and…
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High 8.2
free5GC: SMF UPI DELETE /upi/v1/upNodesLinks/{ref} panics on AN-node deletion via nil UPF dereference; unauthenticated, state-mutating
free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's SMF mounts the UPI management route group without inbound OAuth2 middleware. On top of that, the DELETE /upi/v1/upNodesLinks/{upNodeRef} handler unconditionally derefer…
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High 8.7
Empty API_TOKEN disables authentication on network-reachable HTTP/SSE transport
Nocturne Memory is a lightweight, rollbackable, and visual Long-Term Memory Server for MCP Agents. Prior to 2.4.1, when API_TOKEN is unset or empty, the BearerTokenAuthMiddleware bypasses authentication for all HTTP requests. Combined with the default 0.0.0.0…
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High 7.5
MaxKB: Webhook Trigger Authentication Bypass
MaxKB is an open-source AI assistant for enterprise. Prior to 2.9.0, MaxKB's webhook trigger endpoint (/api/trigger/v1/webhook/{trigger_id}) is accessible without authentication. The WebhookAuth class unconditionally returns (None, {}), which Django REST Fram…
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High 8.1
FastNetMon Community Edition through 1.2.9 exposes a gRPC API server on port 50052 with no authentication mechanism. Th…
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High 8.6
Trilium Notes: Authentication Bypass in Clipper API for Electron (Desktop) Builds
Trilium Notes is a cross-platform, hierarchical note taking application focused on building large personal knowledge bases. In versions 0.102.1 and prior, the Clipper API in Trilium Desktop (v0.101.3) allows full authentication bypass when running in an Elect…
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High —
CamoFox MCP: Unauthenticated HTTP MCP browser-control surface
# Unauthenticated HTTP MCP browser-control surface in `camofox-mcp` ## Summary `camofox-mcp` exposed a Streamable HTTP MCP endpoint at `/mcp` with rate limiting but no inbound MCP-layer authentication. When HTTP mode was enabled, any client that could reach `…
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High 8.8
Missing authentication for critical function in ScadaBR
In ScadaBR version 1.2.0, a Missing Authentication for Critical Function vulnerability could allow an unauthenticated attacker to send a HTTP GET requests to the SCADA system and inject arbitrary sensor readings.
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High 7.7
DevSpace UI Server WebSocket CheckOrigin does not validate source
DevSpace is a client-only developer tool for cloud-native development with Kubernetes. Prior to 6.3.21, DevSpace's UI server WebSocket accepts connections from all origins by default, and therefore several endpoints are exposed via this WebSocket. When a deve…
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High 7.3
The locally served web site on the Garmin WDU (v1 1.4.6 and v2 5.0) allows its authentication to be bypassed. The WDU w…
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High 8.8
ChurchCRM: Cross-Site Request Forgery (CSRF) Leading to Admin Privilege Escalation
ChurchCRM is an open-source church management system. Prior to 7.3.2, UserEditor.php processes user account creation and permission updates entirely through $_POST parameters with no CSRF token validation. An unauthenticated attacker can craft a malicious HTM…
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High 8.7CVE-2026-5029 Public exploit
RCE in Code Runner MCP Server
A remote code execution vulnerability exists in Code Runner MCP Server when run with the --transport http option, which exposes the /mcp JSON-RPC endpoint without authentication on port 3088. An unauthenticated remote attacker can invoke the run-code MCP tool…
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High 7.5
mem0 server lacks authentication and authorization controls for its memory management API endpoints
The mem0 1.0.0 server lacks authentication and authorization controls for its memory management API endpoints. Critical functions such as updating memory records (PUT /memories/{memory_id}) are exposed without any verification of the requester's identity or p…
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High 8.7
Network-AI: Missing authentication on MCP HTTP endpoint allows unauthenticated privileged tool calls
Network-AI is a TypeScript/Node.js multi-agent orchestrator. Prior to 5.1.3, the MCP HTTP transport accepts JSON-RPC tools/call requests with no authentication, session, origin, or token check, and dispatches them directly to the orchestrator's tool registry.…
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High 8.2
In JetBrains TeamCity before 2026.1 2025.11.5 authenticated users could expose server API to unauthorised access
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High —
gmaps-mcp's unauthenticated HTTP transport allows unlimited Google Maps API calls at operator expense
## Unauthenticated HTTP Transport Allows Unlimited Google Maps API Calls at Operator Expense The `gmaps-mcp` codebase was reviewed at commit `e671db68c804c9e67d51582d3280839ffa65f127` and three issues worth flagging were discovered — one high-severity, one me…
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High 7.3
PraisonAI ships and generates a legacy API server with authentication disabled by default, allowing unauthenticated workflow execution
PraisonAI is a multi-agent teams system. From version 2.5.6 to before version 4.6.34, PraisonAI ships a legacy Flask API server with authentication disabled by default. When that server is used, any caller that can reach it can access /agents and trigger the …
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High 8.1
nginx-ui: Unauthenticated first-boot instance claim via POST /api/install allows remote bootstrap takeover
Nginx UI is a web user interface for the Nginx web server. In version 2.3.5, an unauthenticated bootstrap takeover exists in nginx-ui during the initial installation window exposed by POST /api/install. At time of publication no public patches are available.
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High 8.1
nginx-ui: Unauthenticated First-Run Installer Allows Remote Initial Admin Claim
Nginx UI is a web user interface for the Nginx web server. From version 2.0.0 to before version 2.3.8, an unauthenticated network attacker can claim the initial administrator account on a fresh nginx-ui instance during the first-run setup window. The public /…
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High 7.3
PrefectHQ prefect WebSocket Endpoint in missing authentication
A flaw has been found in PrefectHQ prefect up to 3.6.13. Affected is an unknown function of the file /api/events/in of the component WebSocket Endpoint. Executing a manipulation can lead to missing authentication. The attack may be performed from remote. The …
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High 7.8
Traefik: Forwarded alias spoofing top pre-auth decision bypass
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a high severity authentication bypass vulnerability in Traefik's ForwardAuth and snippet-based authentication middleware. Traefik's forwarded-heade…
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High 7.1
django-mdeditor is Missing Authentication for Critical Function
All versions of the package django-mdeditor are vulnerable to Missing Authentication for Critical Function in the image upload endpoint. An attacker can upload malicious files and achieve arbitrary code execution since this endpoint lacks authentication prote…
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High 8.0
A vulnerability in the access control mechanism of SonicOS may allow certain management interface functions to be acces…
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High 8.2
Cisco Intersight Device Connector for Nutanix Prism Central Unauthenticated API Access
An improper access control vulnerability exists in the Cisco Intersight Device Connector for Nutanix Prism Central. The service exposes an API passthrough endpoint on TCP port 7373 that is accessible within the network scope of the deployment environment with…
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High 7.5
VEGA: Privilege escalation through unsecured configuration interface in VEGAPULS devices
An unsecured configuration interface on affected devices allows unauthenticated remote attackers to access sensitive information, including hashed credentials and access codes.
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High 8.7
Authentication Bypass
Penetration Testing engineers at Amazon have identified a security flaw related to request handling in the web server component that could, under certain conditions, lead to unintended access to protected functions. The manufacturer has released patch firmwar…
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High 7.3
666ghj MiroFish REST API Endpoint __init__.py create_app missing authentication
A flaw has been found in 666ghj MiroFish up to 0.1.2. This affects the function create_app of the file backend/app/__init__.py of the component REST API Endpoint. Executing a manipulation can lead to missing authentication. It is possible to launch the attack…
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High 8.8CVE-2026-41473 Public exploit
CyberPanel < 2.4.5 Unauthenticated API Access via AI Scanner Endpoints
CyberPanel versions prior to 2.4.5 contain an authentication bypass vulnerability in the AI Scanner worker API endpoints that allows unauthenticated remote attackers to write arbitrary data to the database by sending requests to the /api/ai-scanner/status-web…
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High 7.8
Deskflow: Local privilege escalation via unauthenticated IPC
Deskflow is a keyboard and mouse sharing app. In 1.20.0, 1.26.0.134, and earlier, Deskflow daemon runs as SYSTEM and exposes an IPC named pipe with WorldAccessOption enabled. The daemon processes privileged commands without authentication, allowing any local …
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High 8.5
A client holding only a read JWT scope can still register itself as a signal provider through the production kuksa.val.…
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High 7.5
SenseLive X3050 Missing authentication for critical function
A vulnerability in SenseLive X3050’s management ecosystem allows unauthenticated discovery of deployed units through the vendor’s management protocol, enabling identification of device presence, identifiers, and management interfaces without requiring credent…
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High 8.7
Missing authentication for critical function in SpiceJet Online Booking System
A weakness in SpiceJet’s public booking retrieval page permits full passenger booking details to be accessed using only a PNR and last name, with no authentication or verification mechanisms. This results in exposure of extensive personal, travel, and booking…
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High 7.7
Flowise: Unauthenticated OAuth 2.0 Access Token Disclosure via Public Chatflow
Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.0, Flowise contains an authentication bypass vulnerability that allows an unauthenticated attacker to obtain OAuth 2.0 access tokens associated with a public…
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High 8.4
Terminal Services Manager 3.1 Buffer Overflow SEH
Terminal Services Manager 3.1 contains a stack-based buffer overflow vulnerability in the computer names field that allows local attackers to execute arbitrary code by triggering structured exception handling. Attackers can craft a malicious input file with s…
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High —
engram: HTTP server CORS wildcard + auth-off-by-default enables CSRF graph exfiltration and persistent indirect prompt injection
### Summary The local HTTP server started by `engram server` (binding `127.0.0.1:7337` by default) was exposed to any browser origin with no authentication unless `ENGRAM_API_TOKEN` was explicitly set. Combined with `Access-Control-Allow-Origin: *` on every r…
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High 8.7
Inadequate access control vulnerability in Fullstep
Inadequate access control in the registration process in Fullstep V5, which could allow unauthenticated users to obtain a valid JWT token with which to interact with authenticated API resources. Successful exploitation of this vulnerability could allow an una…
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High 8.8
MinIO has an Unauthenticated Object Write via Missing Signature Verification in Unsigned-Trailer Uploads
MinIO is a high-performance object storage system. Starting in RELEASE.2023-05-18T00-05-36Z and prior to RELEASE.2026-04-11T03-20-12Z, an authentication bypass vulnerability in MinIO's Snowball auto-extract handler (`PutObjectExtractHandler`) allows any user …
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High 7.7
NVIDIA KAI Scheduler contains a vulnerability where an attacker could access API endpoints without authorization. A suc…
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High 8.7
Information Disclosure Vulnerability in Quantum Networks Router QN-I-470
This vulnerability exists in Quantum Networks router due to improper access control and insecure default configuration in the web-based management interface. An unauthenticated attacker could exploit this vulnerability by accessing exposed API endpoints on th…
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High 7.7
Glances Vulnerable to Cross-Origin Information Disclosure via Unauthenticated REST API (/api/4) due to Permissive CORS
Glances is an open-source system cross-platform monitoring tool. Prior to version 4.5.4, the Glances web server exposes a REST API (`/api/4/*`) that is accessible without authentication and allows cross-origin requests from any origin due to a permissive CORS…