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CWE-306 (关键功能的认证机制缺失) — Vulnerability Class 1920

1920 vulnerabilities classified as CWE-306 (关键功能的认证机制缺失). AI Chinese analysis included.

CWE-306 represents a critical authentication weakness where software fails to verify user identity before executing sensitive operations or consuming substantial resources. Attackers typically exploit this vulnerability by directly invoking administrative endpoints, initiating high-cost processes, or accessing restricted data without valid credentials, effectively bypassing security controls. This oversight allows unauthorized users to perform actions intended only for authenticated individuals, leading to privilege escalation, data breaches, or denial of service through resource exhaustion. To mitigate this risk, developers must implement robust access control mechanisms that strictly enforce authentication checks on all critical functions. This involves integrating secure session management, validating tokens for every request, and applying the principle of least privilege to ensure that only verified users with appropriate permissions can trigger sensitive operations or consume significant system resources.

MITRE CWE Description
The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
Common Consequences (1)
Access Control, Other Gain Privileges or Assume Identity, Varies by Context
Exposing critical functionality essentially provides an attacker with the privilege level of that functionality. The consequences will depend on the associated functionality, but they can range from reading or modifying sensitive data, accessing administrative or other privileged functionality, or p…
Mitigations (5)
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 access…
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.
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…
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].
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].
Examples (2)
In the following Java example the method createBankAccount is used to create a BankAccount object for a bank management application.
public BankAccount createBankAccount(String accountNumber, String accountType, String accountName, String accountSSN, double balance) { BankAccount account = new BankAccount(); account.setAccountNumber(accountNumber); account.setAccountType(accountType); account.setAccountOwnerName(accountName); account.setAccountOwnerSSN(accountSSN); account.setBalance(balance); return account; }
Bad · Java
private boolean isUserAuthentic = false; // authenticate user, // if user is authenticated then set variable to true // otherwise set variable to false public boolean authenticateUser(String username, String password) { ... } public BankAccount createNewBankAccount(String accountNumber, String accountType, String accountName, String accountSSN, double balance) { BankAccount account = null; if (isUserAuthentic) { account = new BankAccount(); account.setAccountNumber(accountNumber); account.setAccountType(accountType); account.setAccountOwnerName(accountName); account.setAccountOwnerSSN(accountS
Good · Java
In 2022, the OT:ICEFALL study examined products by 10 different Operational Technology (OT) vendors. The researchers reported 56 vulnerabilities and said that the products were "insecure by design" [REF-1283]. If exploited, these vulnerabilities often allowed adversaries to change how the products operated, ranging from denial of service to changing the code that the products executed. Since these…
CVE ID Title CVSS Severity Published
CVE-2026-5320 vanna-ai vanna Chat API Endpoint v2 missing authentication — vanna 7.3 High 2026-04-02
CVE-2026-21767 HCL BigFix Platform is affected by insufficient authentication — BigFix Platform 4.0 Medium 2026-04-01
CVE-2026-34999 OpenViking 0.2.5 < 0.2.14 Bot Proxy Endpoints Allow Unauthenticated Access — OpenViking 5.3 Medium 2026-04-01
CVE-2026-34732 AVideo: Missing Authentication in CreatePlugin list.json.php Template Affects 21 Endpoints — AVideo 5.3 Medium 2026-03-31
CVE-2026-34731 AVideo: Unauthenticated Live Stream Termination via RTMP Callback on_publish_done.php — AVideo 7.5 High 2026-03-31
CVE-2026-1579 PX4 Autopilot Missing authentication for critical function — Autopilot 9.8 Critical 2026-03-31
CVE-2026-3356 Missing Authentication for Critical Function vulnerability in Anritsu Remote Spectrum Monitor — Remote Spectrum Monitor MS27100A 9.8 - 2026-03-31
CVE-2026-34227 Sliver One-Click Remote Access: Insecure CORS & Unauthenticated MCP Interface — sliver 8.8AI High AI 2026-03-31
CVE-2026-34200 Nhost CLI MCP Server: Missing Inbound Authentication on Explicitly Bound Network Port — nhost 8.0 - 2026-03-31
CVE-2026-34162 FastGPT: Unauthenticated SSRF via httpTools Endpoint Leads to Internal API Key Theft — FastGPT 10.0 Critical 2026-03-31
CVE-2026-33032 Nginx UI: Unauthenticated MCP Endpoint Allows Remote Nginx Takeover — nginx-ui 9.8 Critical 2026-03-30
CVE-2026-5000 PromtEngineer localGPT API Endpoint server.py LocalGPTHandler missing authentication — localGPT 7.3 High 2026-03-28
CVE-2018-25224 PMS 0.42 Stack-Based Buffer Overflow via Configuration File — PMS 8.4 High 2026-03-28
CVE-2018-25225 SIPP 3.3 Stack-Based Buffer Overflow via Configuration File — SIPP 8.4 High 2026-03-28
CVE-2026-34411 Appsmith < 1.98 Unauthenticated Instance Configuration Disclosure via Management APIs — Appsmith 5.3 Medium 2026-03-27
CVE-2026-4959 OpenBMB XAgent ShareServer WebSocket Endpoint share.py check_user missing authentication — XAgent 7.3 High 2026-03-27
CVE-2026-33366 BUFFALO Wi-Fi router 访问控制错误漏洞 — BUFFALO Wi-Fi router products 4.6 - 2026-03-27
CVE-2026-3527 AJAX Dashboard - Critical - Access bypass - SA-CONTRIB-2026-022 — AJAX Dashboard 9.1AI Critical AI 2026-03-26
CVE-2026-24068 Missing XPC Client & NSXPC endpoint validation leads to privilege escalation in Vienna Assistant (MacOS) - Vienna Symphonic Library — Vienna Assistant 9.8 - 2026-03-26
CVE-2026-1724 Missing Authentication for Critical Function in GitLab — GitLab 6.8 Medium 2026-03-25
CVE-2026-32326 SHARP多款产品 访问控制错误漏洞 — home 5G HR01 9.1 - 2026-03-25
CVE-2026-2417 Missing Authentication for Critical Function in Pharos Controls Mosaic Show Controller — Mosaic Show Controller 9.8 - 2026-03-24
CVE-2026-33159 Craft CMS: Unauthenticated users could execute project configuration sync operations that should be restricted trusted users — cms 8.6 - 2026-03-24
CVE-2026-33340 LoLLMs WEBUI has unauthenticated Server-Side Request Forgery (SSRF) in /api/proxy endpoint — lollms-webui 9.1 Critical 2026-03-24
CVE-2019-25632 phpFileManager 1.7.8 Local File Inclusion via index.php — phpFileManager 6.2 Medium 2026-03-24
CVE-2026-4649 Auth bypass in Apache Artemis allows reading all internal messages — KNIME Business Hub 6.5 - 2026-03-24
CVE-2026-4640 Galaxy Software Services|Vitals ESP - Missing Authentication — Vitals ESP 7.5 High 2026-03-24
CVE-2026-33719 AVideo Vulnerable to Unauthenticated CDN Configuration Takeover via Empty Default Key Bypass and Mass-Assignment in status.json.php — AVideo 8.6 High 2026-03-23
CVE-2025-15517 Authorization Bypass in HTTP Server Endpoints on TP-Link Archer NX200, NX210, NX500 and NX600 — Archer NX600 v3.0 9.8 - 2026-03-23
CVE-2026-31846 Unauthenticated Credential Disclosure via /goform/ate in Nexxt Nebula 300+ — Nebula 300+ / Tenda F3 V2.0 Firmware 6.5 Medium 2026-03-23

Vulnerabilities classified as CWE-306 (关键功能的认证机制缺失) represent 1920 CVEs. The CWE taxonomy describes the weakness; review individual CVEs for product-specific impact.