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Bug bounty program

CP

Cloudflare Public Bug Bounty

Open on HackerOneAtlas
Platform
HackerOne
Bounties
Pays
Assets in scope
51
Disclosed reports
44
Subdomains
24,298
Vendor on CyberSIXT
Cloudflare (70 CVEs, 0 exploited)

Most upvoted reports44

All reports
Most upvoted reports of Cloudflare Public Bug Bounty
ReportWeaknessDisclosedBountyVotes
HTTP Request Smuggling in Transform Rules using hexadecimal escape sequences in the concat() functionAnalysed#1478633Injection and Smuggling2022-05-16$6,000116
Cloudflare CASB Confused Deputy ProblemAnalysed#1952124No weakness recorded2023-06-07$3,30097
Using special IPv4-mapped IPv6 addresses to bypass local IP banAnalysed#1785260No weakness recorded2023-01-24$7,50078
Bypass of Cloudflare's Cache Keys and WAF via header overflow#3027461Access Control2025-11-18–77
Hijack all emails sent to any domain that uses Cloudflare Email ForwardingAnalysed#1419341Access Control2022-07-28$6,00076
`use-mcp`'s oauth2 process uses a window.open call with untrusted mcp server provided data allowing for code execution under the page using itAnalysed#3211031Cross-site Scripting2025-09-30$55075
Yet Another CASB Integration Takeover of Active IntegrationsAnalysed#2094346No weakness recorded2023-11-13–68
[Variation of #3321406] YetAnother 1-Click Chaining of Self-XSS, Cookie Tossing and AntiCSRF Token Prediction leads to auto approval in AccessTempAuthAnalysed#3423950Cross-site Scripting2026-04-14–63
AI Playground XSS to steal user-chat messages and access to connected MCP ServerAnalysed#3424998Cross-site Scripting2026-02-26–62
Bypass R2 payment screenAnalysed#2170559Authentication2023-11-10$35057

Subdomains24,298

Root
Scope
Name suggests
First seen
Text file24,298 names
Subdomains of Cloudflare Public Bug Bounty
NameScopeFirst seen
cf-190-93-254-195.cloudflare.comIn scope2026-11-14
cf-190-93-254-196.cloudflare.comIn scope2026-11-14
cf-190-93-254-197.cloudflare.comIn scope2026-11-14
cf-190-93-254-198.cloudflare.comIn scope2026-11-14
cf-190-93-254-199.cloudflare.comIn scope2026-11-14
cf-190-93-254-20.cloudflare.comIn scope2026-11-14
cf-190-93-254-200.cloudflare.comIn scope2026-11-14
cf-190-93-254-201.cloudflare.comIn scope2026-11-14
cf-190-93-254-202.cloudflare.comIn scope2026-11-14
cf-190-93-254-203.cloudflare.comIn scope2026-11-14
cf-190-93-254-204.cloudflare.comIn scope2026-11-14
cf-190-93-254-205.cloudflare.comIn scope2026-11-14
cf-190-93-254-206.cloudflare.comIn scope2026-11-14
cf-190-93-254-207.cloudflare.comIn scope2026-11-14
cf-190-93-254-208.cloudflare.comIn scope2026-11-14
cf-190-93-254-209.cloudflare.comIn scope2026-11-14
cf-190-93-254-21.cloudflare.comIn scope2026-11-14
cf-190-93-254-210.cloudflare.comIn scope2026-11-14
cf-190-93-254-211.cloudflare.comIn scope2026-11-14
cf-190-93-254-212.cloudflare.comIn scope2026-11-14
cf-190-93-254-213.cloudflare.comIn scope2026-11-14
cf-190-93-254-214.cloudflare.comIn scope2026-11-14
cf-190-93-254-215.cloudflare.comIn scope2026-11-14
cf-190-93-254-216.cloudflare.comIn scope2026-11-14
cf-190-93-254-217.cloudflare.comIn scope2026-11-14
cf-190-93-254-218.cloudflare.comIn scope2026-11-14
cf-190-93-254-219.cloudflare.comIn scope2026-11-14
cf-190-93-254-22.cloudflare.comIn scope2026-11-14
cf-190-93-254-220.cloudflare.comIn scope2026-11-14
cf-190-93-254-221.cloudflare.comIn scope2026-11-14
cf-190-93-254-222.cloudflare.comIn scope2026-11-14
cf-190-93-254-223.cloudflare.comIn scope2026-11-14
cf-190-93-254-224.cloudflare.comIn scope2026-11-14
cf-190-93-254-225.cloudflare.comIn scope2026-11-14
cf-190-93-254-226.cloudflare.comIn scope2026-11-14
cf-190-93-254-227.cloudflare.comIn scope2026-11-14
cf-190-93-254-228.cloudflare.comIn scope2026-11-14
cf-190-93-254-229.cloudflare.comIn scope2026-11-14
cf-190-93-254-23.cloudflare.comIn scope2026-11-14
cf-190-93-254-230.cloudflare.comIn scope2026-11-14
cf-190-93-254-231.cloudflare.comIn scope2026-11-14
cf-190-93-254-232.cloudflare.comIn scope2026-11-14
cf-190-93-254-233.cloudflare.comIn scope2026-11-14
cf-190-93-254-234.cloudflare.comIn scope2026-11-14
cf-190-93-254-235.cloudflare.comIn scope2026-11-14
cf-190-93-254-236.cloudflare.comIn scope2026-11-14
cf-190-93-254-237.cloudflare.comIn scope2026-11-14
cf-190-93-254-238.cloudflare.comIn scope2026-11-14
cf-190-93-254-239.cloudflare.comIn scope2026-11-14
cf-190-93-254-24.cloudflare.comIn scope2026-11-14
cf-190-93-254-240.cloudflare.comIn scope2026-11-14
cf-190-93-254-241.cloudflare.comIn scope2026-11-14
cf-190-93-254-242.cloudflare.comIn scope2026-11-14
cf-190-93-254-243.cloudflare.comIn scope2026-11-14
cf-190-93-254-244.cloudflare.comIn scope2026-11-14
cf-190-93-254-245.cloudflare.comIn scope2026-11-14
cf-190-93-254-246.cloudflare.comIn scope2026-11-14
cf-190-93-254-247.cloudflare.comIn scope2026-11-14
cf-190-93-254-248.cloudflare.comIn scope2026-11-14
cf-190-93-254-249.cloudflare.comIn scope2026-11-14
cf-190-93-254-25.cloudflare.comIn scope2026-11-14
cf-190-93-254-250.cloudflare.comIn scope2026-11-14
cf-190-93-254-251.cloudflare.comIn scope2026-11-14
cf-190-93-254-252.cloudflare.comIn scope2026-11-14
cf-190-93-254-253.cloudflare.comIn scope2026-11-14
cf-190-93-254-254.cloudflare.comIn scope2026-11-14
cf-190-93-254-26.cloudflare.comIn scope2026-11-14
cf-190-93-254-27.cloudflare.comIn scope2026-11-14
cf-190-93-254-28.cloudflare.comIn scope2026-11-14
cf-190-93-254-29.cloudflare.comIn scope2026-11-14
cf-190-93-254-30.cloudflare.comIn scope2026-11-14
cf-190-93-254-31.cloudflare.comIn scope2026-11-14
cf-190-93-254-32.cloudflare.comIn scope2026-11-14
cf-190-93-254-33.cloudflare.comIn scope2026-11-14
cf-190-93-254-34.cloudflare.comIn scope2026-11-14
cf-190-93-254-35.cloudflare.comIn scope2026-11-14
cf-190-93-254-36.cloudflare.comIn scope2026-11-14
cf-190-93-254-37.cloudflare.comIn scope2026-11-14
cf-190-93-254-38.cloudflare.comIn scope2026-11-14
cf-190-93-254-39.cloudflare.comIn scope2026-11-14
cf-190-93-254-4.cloudflare.comIn scope2026-11-14
cf-190-93-254-40.cloudflare.comIn scope2026-11-14
cf-190-93-254-41.cloudflare.comIn scope2026-11-14
cf-190-93-254-42.cloudflare.comIn scope2026-11-14
cf-190-93-254-43.cloudflare.comIn scope2026-11-14
cf-190-93-254-44.cloudflare.comIn scope2026-11-14
cf-190-93-254-45.cloudflare.comIn scope2026-11-14
cf-190-93-254-46.cloudflare.comIn scope2026-11-14
cf-190-93-254-47.cloudflare.comIn scope2026-11-14
cf-190-93-254-48.cloudflare.comIn scope2026-11-14
cf-190-93-254-49.cloudflare.comIn scope2026-11-14
cf-190-93-254-5.cloudflare.comIn scope2026-11-14
cf-190-93-254-50.cloudflare.comIn scope2026-11-14
cf-190-93-254-51.cloudflare.comIn scope2026-11-14
cf-190-93-254-52.cloudflare.comIn scope2026-11-14
cf-190-93-254-53.cloudflare.comIn scope2026-11-14
cf-190-93-254-54.cloudflare.comIn scope2026-11-14
cf-190-93-254-55.cloudflare.comIn scope2026-11-14
cf-190-93-254-56.cloudflare.comIn scope2026-11-14
cf-190-93-254-57.cloudflare.comIn scope2026-11-14

18,935 names are covered by the program's own scope; 2 were first seen this week. Names come from ProjectDiscovery's public Chaos dataset (passive sources: certificate logs, DNS and other public data), matched to the program by its listing and its own domain scope. A name being in a dataset is not permission to test it: only what the program's own scope says is in scope, and its policy decides. CyberSIXT does not resolve, probe or scan these names. Tags come from the name alone. Source: ProjectDiscovery Chaos. Subdomains on the Atlas, or search the subdomains of every program.

A name in a dataset is not permission to test it: the program's own scope and rules decide. Data as of 2026-11-15.

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