Security vulnerabilities and automated fixes for express issues
18 posts found
A high-severity CSRF vulnerability was discovered in `backend/server.js` of an Express.js application — the server had no CSRF middleware protecting state-changing routes. Without CSRF protection, attackers could trick authenticated users into unknowingly submitting forged requests (like transferring funds or changing account details). The fix adds the `csurf` package with cookie-based token validation, closing the attack surface with a few targeted lines of code.
A high-severity command injection vulnerability was discovered in `webhook/src/routes/bid-requests/create.route.js`, where user-controlled values were passed directly to route handlers without any schema validation. Without input validation, attackers could supply malformed or malicious values — including shell metacharacters — that propagate into downstream command construction, enabling arbitrary command execution. The fix adds strict UUID and type validation middleware directly in the route d
A critical unrestricted file upload vulnerability was discovered in `mainsystem/routes/admin/profile.js`, where the avatar upload endpoint accepted any file type without validation. An authenticated attacker could upload a malicious server-side script to a web-accessible directory and execute arbitrary code on the server. The fix adds MIME type filtering, an allowlist of safe image formats, and a 2 MB file size limit to the multer middleware.
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
Two public API endpoints in `server.js` — `/api/health` and `/api/contact` — were exposed without any rate limiting middleware, allowing attackers to exhaust server resources or spam an SMTP server with unlimited requests. The fix adds rate limiting to both endpoints, with stricter controls on the resource-intensive `/api/contact` route that triggers email sending operations. This change closes a directly exploitable denial-of-service vector in a production web service.
A critical hardcoded credential vulnerability was discovered in `routes/bing-routes.js` where a WordPress application password was embedded directly in the source code as a fallback value. This meant anyone with access to the repository could obtain valid authentication credentials. The fix removes the hardcoded fallback and requires proper environment variable configuration.
A high-severity CSRF vulnerability was identified in `tower_game/index.js` where the Express application lacked any Cross-Site Request Forgery protection middleware. Without CSRF validation, an attacker could craft malicious pages that trick authenticated users into submitting unwanted requests to the game server. The fix adds `csurf` middleware with cookie-based token storage in just four lines of code.
A high-severity CSRF vulnerability was discovered in `libProxy.js` of an Express.js application — the app had no CSRF middleware protecting its state-changing routes, leaving them open to cross-site request forgery attacks. The fix introduces a `csrf` token library, a `/csrf-token` endpoint to issue tokens, and a middleware that validates `x-csrf-token` headers or `_csrf` body fields on all non-safe HTTP methods. This proactive hardening removes an exploit primitive that could be chained with ot
A high-severity CRLF injection vulnerability (CVE-2026-55603) was discovered in http-proxy-middleware versions prior to 3.0.7, allowing attackers to inject carriage return and line feed characters into proxied requests, potentially compromising data integrity. The fix upgrades the dependency from version 3.0.5 to 3.0.7, which adds proper sanitization of CR/LF characters in user-controlled input before forwarding requests to backend services.
A high-severity denial of service vulnerability in the `path-to-regexp` package (CVE-2026-4926) could allow attackers to craft malicious regular expressions that consume excessive CPU resources. The fix upgrades from version 8.2.0 to 8.4.0, which hardens regex handling and prevents ReDoS (Regular Expression Denial of Service) attacks in Express applications.
A high-severity security vulnerability was discovered in a React-Express booking application where the Express backend lacked CSRF middleware protection, while the frontend's coupon code input field in `Listing.jsx` allowed unrestricted user input. The fix implemented strict input validation using a regex pattern that whitelists only alphanumeric characters, hyphens, and underscores, preventing malicious payloads from reaching backend database operations.