How Developers Can Block Disposable Email Signups Without SMTP Verification

·1 views

Disposable email addresses pose risks for applications that depend on email for account recovery, fraud prevention, and trial management. A developer guide published on DEV Community outlines a lightweight server-side approach to screen emails before accepting signups, without relying on slow or unreliable SMTP probing. The method combines syntax validation, disposable domain detection, free provider identification, and DNS MX record lookups to assign a risk level of LOW, HIGH, or UNKNOWN. A RapidAPI-based service is used to perform these checks, with server-side Node.js code ensuring the API key is never exposed to the frontend. The guide emphasizes that these checks serve as an early risk filter only, and that a confirmation email or one-time code remains the correct method for verifying actual mailbox ownership.

Read the full story at DEV Community

This is an AI-generated summary. ShortSingh links to the original source for the complete article.

Discussion (0)

CTF Challenge Shows How HTTP Request Smuggling Bypasses Path-Based Access Controls

A web challenge from BrunnerCTF 2026 demonstrated a classic CL.TE HTTP request smuggling vulnerability in a simulated internal wiki application. The target page, /wiki/internal/flag, was hinted at via robots.txt but returned a 403 Forbidden response to direct access. The exploit worked because the front-end proxy honored the Content-Length header while the backend Kestrel server prioritized Transfer-Encoding: chunked, causing the two layers to disagree on where one request ended and another began. By crafting a single POST request containing a smuggled GET for the restricted path, the attacker bypassed path-based authorization middleware that only applied to externally routed requests. The smuggled request reached Kestrel directly on the same keep-alive connection, returning the internal article and the hidden flag.

0 comments Read more at DEV Community

ProgrammingDEV Community ·

Dev Builds CUBELANDS, a Procedural Open-World Action-Adventure Headed to Steam

An independent developer is building CUBELANDS, an early-alpha third-person open-world action-adventure game planned for release on Steam. The game's core design principle is full procedural generation, where a single seed determines terrain, settlements, cultures, characters, equipment, and even boss designs. Gameplay combines exploration, combo-based combat, and traversal mechanics such as gliding, grappling, swimming, and slope-surfing. Combat features charged and aerial attacks, parries, perfect-dodge counters, and multi-phase procedural bosses. No release date has been announced, with the developer focused on refining the world, combat, and presentation before sharing further progress updates.

0 comments Read more at DEV Community

ProgrammingDEV Community ·

How Video Streaming Pipelines Work: A System Design Breakdown

A technical explainer on DEV Community walks through the system design behind video streaming, from upload to playback. The piece frames the problem using a relatable scenario: sending a large skydiving video to a friend across the world. It outlines functional requirements for both uploaders and viewers, including resumable uploads, progress tracking, and smooth cross-network playback. The article also highlights non-functional challenges such as handling massive files, connection drops mid-upload, and sudden spikes in concurrent viewers. It argues that naive single-request upload approaches fail at scale, setting the stage for more robust pipeline architectures.

0 comments Read more at DEV Community

ProgrammingDEV Community ·

Google Identifies Three Russian Spy Groups Hijacking Auth Flows, Bypassing MFA

Google Threat Intelligence Group published research on August 20, 2026, detailing three suspected Russian espionage clusters — UNC6293, UNC7005, and UNC5976 — that exploit authentication flows rather than stealing passwords directly. The groups target academics, government officials, aerospace and defense personnel, and think tank staff across Europe, Ukraine, and the United States. Their methods include abusing OAuth consent flows, application-specific passwords, device code grants, and WhatsApp device linking, meaning fully deployed multi-factor authentication does not stop the attacks. UNC5976, active since at least March 2026, automated OAuth token harvesting using legitimate cloud infrastructure, redirecting victims through real Google login pages before silently stealing tokens post-authentication. Google disrupted at least 12 related domains, but UNC5976 adapted by migrating its phishing infrastructure to other providers and also deployed a malicious Excel plugin called HEADRUSH targeting Ukrainian organizations.

0 comments Read more at DEV Community