Security vulnerabilities and automated fixes for authentication issues
45 posts found
Authentication vulnerabilities encompass flaws in identity verification mechanisms including weak password policies, broken session management, credential stuffing susceptibility, and improper token validation. These flaws can allow attackers to impersonate legitimate users or bypass login entirely.
Related CWEs
Affected Languages
A critical authentication bypass vulnerability was discovered in `backend/services/auth-state.js` where the `tokenTtlSeconds()` function used `jwt.decode()` instead of `jwt.verify()`, allowing attackers to forge JWT tokens with arbitrary claims. Because `jwt.decode()` never validates the cryptographic signature, any attacker could craft a token with a manipulated expiration time or elevated privileges and have it accepted as legitimate. The fix replaces the insecure decode call with `jwt.verify(
A critical authentication bypass was discovered in `JwtExtractor.java` where `JWT.decode()` was used instead of a proper signature-verifying method, allowing any attacker to forge a JWT with an arbitrary username — including `admin` — and gain unauthorized access. The fix adds clear documentation establishing the trust boundary: signature validation must occur upstream, and the extracted claims are for display purposes only. This change prevents the class from being misused as an authorization g
A critical vulnerability in a Node.js Panel Connector API (CVE-2025-7783) left 14 endpoints—including shell command execution, file deletion, and file writing—completely open to unauthenticated access. The comment in the source code even declared "NO AUTH — Full Open Access," making it a textbook example of a missing authentication control. The fix adds a Bearer token middleware guard on all `/api` routes, blocking unauthorized requests before they reach any sensitive handler.
A missing OAuth state parameter validation in `src/account_manager.js` left the `startOAuthServer()` function vulnerable to CSRF attacks, allowing an attacker to inject their own authorization code into a victim's active OAuth session. The fix generates a cryptographically random state token using `crypto.randomBytes()`, returns it alongside the server handle, and rejects any callback where the returned state doesn't match — closing the attack window entirely. This affects all downstream consume
A critical vulnerability in `api/firebase-config.js` exposed all Firebase configuration values — including API keys, app IDs, and project IDs — to any unauthenticated caller. With no access controls, CORS restrictions, or rate limiting in place, attackers could retrieve live credentials and directly access Firebase services. The fix adds shared-secret authentication using timing-safe comparison, origin validation, and method enforcement.
CVE-2026-64642 is a high-severity authentication bypass vulnerability in Next.js that affects App Router applications using Turbopack with a single locale configuration. The flaw allows attackers to circumvent middleware and proxy security controls, potentially gaining unauthorized access to protected routes. Upgrading from Next.js 16.2.7 to 16.2.11 closes the vulnerability entirely.
A critical OAuth 2.0 CSRF vulnerability in `login_weibo.php` allowed attackers to forge Weibo login requests by exploiting the missing `state` parameter validation. Without this check, an attacker could trick a victim's browser into completing an OAuth flow with the attacker's authorization code, potentially hijacking the victim's session. The fix generates a cryptographically random state token, stores it in the session, and validates it on callback.
The `/token` endpoint in `plugin/multiplex/index.js` generated presentation control tokens without verifying the requester's identity, allowing any attacker with network access to seize control of a live reveal.js presentation. The fix restricts token generation to localhost-only requests and replaces a broken cryptographic primitive with a proper SHA-256 hash. Together, these changes eliminate both the access-control gap and a secondary cryptographic weakness in a single targeted patch.
Four Express.js API endpoints in `index.js` — `/api/config`, `/api/subscriptions`, `/api/sites`, and `/api/refresh` — were fully accessible without any authentication, allowing any remote attacker to retrieve sensitive application data. The fix introduces both an API key authentication middleware and CSRF token protection, ensuring only authorized clients can interact with these endpoints. This is a common but critical oversight in Node.js web services that can expose configuration secrets and s
CVE-2026-73420 is a critical authentication bypass vulnerability in Auth.js (next-auth) where the email normalizer validates an address before applying Unicode normalization, allowing an attacker to craft an email containing a Unicode homoglyph that looks like "@" to slip past validation and impersonate another user. The fix upgrades next-auth from 4.24.13 to 4.24.15 (and 5.0.0-beta.32 for the beta line), ensuring normalization happens before validation so lookalike characters are resolved to th
A critical security vulnerability was discovered in the Apple Store API implementation where three authentication endpoints (`/auth/login`, `/auth/refresh`, `/auth/reset`) lacked rate limiting protection. This allowed unlimited authentication attempts from a single IP address, enabling credential stuffing and brute force attacks. The fix implements an in-memory rate limiter that restricts each IP to 5 requests per 15-minute window.
A FastAPI application serving as a MyShows proxy was configured to allow all origins with credentials enabled, creating a dangerous CORS misconfiguration that could let any malicious website silently harvest authentication tokens. The fix was a single-line change — setting `allow_credentials=False` — but the implications of leaving it unchecked were significant. This post breaks down exactly how the vulnerability works, why FastAPI's behavior makes it subtler than it first appears, and how to co