Episode 160: Cloudflare Zero-days & Mail Unsubscribing for XSS
Episode 160: In this episode of Critical Thinking - Bug Bounty Podcast Joseph and Brandyn. Chat through some news, Including a Cloudflare Zero-day, Turning List-Unsubscribe into an SSRF/XSS Gadget, & Magic String Denial of Service in Claude.
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:
Critical Research Lab:
====== 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: Adobe.
Use code CTBB040126, and get a 10% bonus on your bounty for any AI vulnerability which is mapped to the OWASP LLM top 10.
Valid on Adobe Acrobat Web - AI Assistant / PDF Spaces / Content Creation and presentation features using Express
Adobe Express AI Assistant.
Valid through April 1st, 2026
Also we have a Google Cloud VRP Swag Bonus! Mention the podcast in any rewarded (cash or credit) VRP report submission before the end of April to receive bonus swag!
====== Resources ======
Cloudflare Zero-day
https://fearsoff.org/research/cloudflare-acme
Turning List-Unsubscribe into an SSRF/XSS Gadget
https://security.lauritz-holtmann.de/post/xss-ssrf-list-unsubscribe/
Breaking Multi-Tenant Isolation in Heroku Postgres
https://allistair.sh/blog/breaking-heroku-postgres/
Parse and Parse: MIME Validation Bypass to XSS via Parser Differential
https://lab.ctbb.show/research/parse-and-parse-mime-validation-bypass-to-xss-via-parser-differential
Claude Magic String Denial of Service
https://x.com/Frichette_n/status/2013988503336415522
From WebView to Remote Code Injection
https://djini.ai/from-webview-to-remote-code-injection/
DOM XSS Is Not Dead: The Rise of Polyglot Payloads
https://blogs.jsmon.sh/dom-xss-is-not-dead-the-rise-of-polyglot-payloads/
====== Timestamps ======
(00:00:00) Introduction
(00:06:17) Cloudflare Zero-day & Turning List-Unsubscribe into an SSRF/XSS Gadget
(00:16:57) Breaking Multi-Tenant Isolation in Heroku Postgres & CTBB Research
(00:25:46) Claude Magic String Denial of Service & From WebView to Remote Code Injection
