Cloudflare Public Bug Bounty · Report #3321406
[Variation of #1554049] 1-Click Chaining of Self-XSS, Cookie Tossing and AntiCSRF Token Prediction leads to auto approval in Access Temp Auth
Validstatus
highseverity
39upvotes
14 Apr 2026disclosed
Summary
We have resolved an issue in Cloudflare Access where an exploit chain involving a SAML endpoint could allow for unauthorized approvals within the Temporary Auth workflow. This has been fully remediated, and we thank the researcher for their help in hardening our authentication flows
Detailed Writeup: https://kazama.in/self-xss-to-cloudflare-single-click-approvals/
How it was found
The write-up for this report has not been downloaded yet, or the program disclosed it without one. Read it on HackerOne.