# Episode 169: Attacking OAuth 2.1

Page: https://stenobird.com/podcast/critical-thinking-bug-bounty-podcast-5951018/episode-169-attacking-oauth-2-1
Text version: https://stenobird.com/podcast/critical-thinking-bug-bounty-podcast-5951018/episode-169-attacking-oauth-2-1.md
Podcast: [Critical Thinking - Bug Bounty Podcast](https://stenobird.com/podcast/critical-thinking-bug-bounty-podcast-5951018)
Published: 2026-04-09T09:00:00+00:00
Episode link: https://criticalthinkingpodcast.io
Audio file: https://audio-delivery.cohostpodcasting.com/audio/8d5e4388-13f4-45c8-b82f-aff313a5ac76/episodes/665c5fb5-4c9a-461c-98c2-8a6678a49615/episode.mp3
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JSON: https://stenobird.com/v1/public/podcasts/critical-thinking-bug-bounty-podcast-5951018/episodes/episode-169-attacking-oauth-2-1
Duration seconds: 1816

## Resource

Episode 169: In this episode of Critical Thinking - Bug Bounty Podcast gr3pme goes over some of the changes from OAuth 2.0 vs 2.1 and how Hackers can capitalize. Follow us on twitter at: https://x.com/ctbbpodcast Got any ideas and suggestions? Feel free to send us any feedback here: info@criticalthinkingpodcast.io Shoutout to YTCracker for the awesome intro music! ====== Links ====== Follow your hosts Rhynorater, rez0 and gr3pme on X:  https://x.com/Rhynorater https://x.com/rez0__ https://x.com/gr3pme Critical Research Lab: https://lab.ctbb.show/   ====== Ways to Support CTBBPodcast ====== Hop on the CTBB Discord at https://ctbb.show/discord ! We also do Discord subs at $25, $10, and $5 - premium subscribers get access to private masterclasses, exploits, tools, scripts, un-redacted bug reports, etc. You can also find some hacker swag at https://ctbb.show/merch ! Today's Sponsor: Check out ThreatLocker Ringfencing https://www.criticalthinkingpodcast.io/tl-rf ====== This Week in Bug Bounty ====== Intigriti is providing free Burp Pro for Hackers! https://www.intigriti.com/blog/news/intigriti-collaborates-with-portswigger-to-support-ethical-hacking-excellence ====== Resources ====== Django-allauth Account Takeover (ZeroPath Audit) https://zeropath.com/blog/django-allauth-account-takeover-vulnerabilities CVE-2025-4144: Cloudflare Workers PKCE Bypass https://github.com/cloudflare/workers-oauth-provider/security/advisories/GHSA-qgp8-v765-qxx9 CVE-2025-54576: OAuth2-Proxy Auth Bypass https://zeropath.com/blog/cve-2025-54576-oauth2-proxy-auth-bypass ====== Timestamps ====== (00:00:00) Introduction (00:02:16) OAuth 2.0 Standards (00:12:08) Agent to Agent Communication (00:17:19) CVE Case studies

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## Transcript

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