
Localhost dangers: CORS and DNS rebinding
What is CORS and how can a CORS misconfiguration lead to security issues? In this blog post, we’ll describe some common CORS issues as well as how you can find and fix them.

Resources for securing your supply chain, building more secure applications, and staying up-to-date with the latest vulnerability research. Get comprehensive insights into the latest security trends—and news from the GitHub Security Lab. You can also check out our documentation on code security on GitHub to find out how to keep your code and applications safe.
What is CORS and how can a CORS misconfiguration lead to security issues? In this blog post, we’ll describe some common CORS issues as well as how you can find and fix them.
Every minute, GitHub blocks several secrets with push protection—but secret leaks still remain one of the most common causes of security incidents. Learn how GitHub is making it easier to protect yourself from exposed secrets, including today’s launches of standalone Secret Protection, org-wide scanning, and better access for teams of all sizes.
A step-by-step guide for open source maintainers on how to handle vulnerability reports confidently from the start.
Critical authentication bypass vulnerabilities (CVE-2025-25291 + CVE-2025-25292) were discovered in ruby-saml up to version 1.17.0. In this blog post, we’ll shed light on how these vulnerabilities that rely on a parser differential were uncovered.
Treating exposures as full and complete can help you respond more effectively to focus on what truly matters: securing systems, protecting sensitive data, and maintaining the trust of stakeholders.
How GitHub’s Product Security Engineering team manages our CodeQL implementation at scale and how you can, too.
The partnership between GitHub and Endor Labs enables application security engineers and developers to drastically reduce time spent on open source vulnerabilities, and gives them the tools to go from finding to fixing.
Discover the exciting world of cybersecurity research: what researchers do, essential skills, and actionable steps to begin your journey toward protecting the digital world.
Learn how specially crafted artifacts can be used to attack Maven repository managers. This post describes PoC exploits that can lead to pre-auth remote code execution and poisoning of the local artifacts in Sonatype Nexus and JFrog Artifactory.
In the last few months, we secured 75+ GitHub Actions workflows in open source projects, disclosing 90+ different vulnerabilities. Out of this research we produced new support for workflows in CodeQL, empowering you to secure yours.
We are excited to introduce the new CodeQL Community Packs, a comprehensive set of queries and models designed to enhance your code analysis capabilities. These packs are tailored to augment…
In this post, I’ll walk you through the vulnerabilities I uncovered in the GStreamer library and how I built a custom fuzzing generator to target MP4 files.
Learn how I discovered 11 new vulnerabilities by writing CodeQL models for Gradio framework and how you can do it, too.
Learn about browser extension security and secure your extensions with the help of CodeQL.
As we wrap up Cybersecurity Awareness Month, the GitHub Bug Bounty team is excited to feature another spotlight on a talented security researcher who participates in the GitHub Security Bug Bounty Program—@adrianoapj!
Vulnerability data has grown in volume and complexity over the past decade, but open source and programs like the Github Security Lab have helped supply chain security keep pace.
Learn about a community-developed framework for how to think about this problem holistically and how to use GitHub, particularly, to improve the security in the second half of your software supply chain.
For this year’s Cybersecurity Awareness Month, the GitHub Bug Bounty team is excited to feature another spotlight on a talented security researcher who participates in the GitHub Security Bug Bounty Program—@imrerad!
For this year’s Cybersecurity Awareness Month, GitHub’s Bug Bounty team is excited to offer some additional incentives to security researchers!
Build what’s next on GitHub, the place for anyone from anywhere to build anything.