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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-198-41-222-194.cloudflare.comIn scope2026-11-14
cf-198-41-222-195.cloudflare.comIn scope2026-11-14
cf-198-41-222-196.cloudflare.comIn scope2026-11-14
cf-198-41-222-197.cloudflare.comIn scope2026-11-14
cf-198-41-222-198.cloudflare.comIn scope2026-11-14
cf-198-41-222-199.cloudflare.comIn scope2026-11-14
cf-198-41-222-20.cloudflare.comIn scope2026-11-14
cf-198-41-222-200.cloudflare.comIn scope2026-11-14
cf-198-41-222-201.cloudflare.comIn scope2026-11-14
cf-198-41-222-202.cloudflare.comIn scope2026-11-14
cf-198-41-222-203.cloudflare.comIn scope2026-11-14
cf-198-41-222-204.cloudflare.comIn scope2026-11-14
cf-198-41-222-205.cloudflare.comIn scope2026-11-14
cf-198-41-222-206.cloudflare.comIn scope2026-11-14
cf-198-41-222-207.cloudflare.comIn scope2026-11-14
cf-198-41-222-208.cloudflare.comIn scope2026-11-14
cf-198-41-222-209.cloudflare.comIn scope2026-11-14
cf-198-41-222-21.cloudflare.comIn scope2026-11-14
cf-198-41-222-210.cloudflare.comIn scope2026-11-14
cf-198-41-222-211.cloudflare.comIn scope2026-11-14
cf-198-41-222-212.cloudflare.comIn scope2026-11-14
cf-198-41-222-213.cloudflare.comIn scope2026-11-14
cf-198-41-222-214.cloudflare.comIn scope2026-11-14
cf-198-41-222-215.cloudflare.comIn scope2026-11-14
cf-198-41-222-216.cloudflare.comIn scope2026-11-14
cf-198-41-222-217.cloudflare.comIn scope2026-11-14
cf-198-41-222-218.cloudflare.comIn scope2026-11-14
cf-198-41-222-219.cloudflare.comIn scope2026-11-14
cf-198-41-222-22.cloudflare.comIn scope2026-11-14
cf-198-41-222-220.cloudflare.comIn scope2026-11-14
cf-198-41-222-221.cloudflare.comIn scope2026-11-14
cf-198-41-222-222.cloudflare.comIn scope2026-11-14
cf-198-41-222-223.cloudflare.comIn scope2026-11-14
cf-198-41-222-224.cloudflare.comIn scope2026-11-14
cf-198-41-222-225.cloudflare.comIn scope2026-11-14
cf-198-41-222-226.cloudflare.comIn scope2026-11-14
cf-198-41-222-227.cloudflare.comIn scope2026-11-14
cf-198-41-222-228.cloudflare.comIn scope2026-11-14
cf-198-41-222-229.cloudflare.comIn scope2026-11-14
cf-198-41-222-23.cloudflare.comIn scope2026-11-14
cf-198-41-222-230.cloudflare.comIn scope2026-11-14
cf-198-41-222-231.cloudflare.comIn scope2026-11-14
cf-198-41-222-232.cloudflare.comIn scope2026-11-14
cf-198-41-222-233.cloudflare.comIn scope2026-11-14
cf-198-41-222-234.cloudflare.comIn scope2026-11-14
cf-198-41-222-235.cloudflare.comIn scope2026-11-14
cf-198-41-222-236.cloudflare.comIn scope2026-11-14
cf-198-41-222-237.cloudflare.comIn scope2026-11-14
cf-198-41-222-238.cloudflare.comIn scope2026-11-14
cf-198-41-222-239.cloudflare.comIn scope2026-11-14
cf-198-41-222-24.cloudflare.comIn scope2026-11-14
cf-198-41-222-240.cloudflare.comIn scope2026-11-14
cf-198-41-222-241.cloudflare.comIn scope2026-11-14
cf-198-41-222-242.cloudflare.comIn scope2026-11-14
cf-198-41-222-243.cloudflare.comIn scope2026-11-14
cf-198-41-222-244.cloudflare.comIn scope2026-11-14
cf-198-41-222-245.cloudflare.comIn scope2026-11-14
cf-198-41-222-246.cloudflare.comIn scope2026-11-14
cf-198-41-222-247.cloudflare.comIn scope2026-11-14
cf-198-41-222-248.cloudflare.comIn scope2026-11-14
cf-198-41-222-249.cloudflare.comIn scope2026-11-14
cf-198-41-222-25.cloudflare.comIn scope2026-11-14
cf-198-41-222-250.cloudflare.comIn scope2026-11-14
cf-198-41-222-251.cloudflare.comIn scope2026-11-14
cf-198-41-222-252.cloudflare.comIn scope2026-11-14
cf-198-41-222-253.cloudflare.comIn scope2026-11-14
cf-198-41-222-26.cloudflare.comIn scope2026-11-14
cf-198-41-222-27.cloudflare.comIn scope2026-11-14
cf-198-41-222-28.cloudflare.comIn scope2026-11-14
cf-198-41-222-29.cloudflare.comIn scope2026-11-14
cf-198-41-222-30.cloudflare.comIn scope2026-11-14
cf-198-41-222-31.cloudflare.comIn scope2026-11-14
cf-198-41-222-32.cloudflare.comIn scope2026-11-14
cf-198-41-222-33.cloudflare.comIn scope2026-11-14
cf-198-41-222-34.cloudflare.comIn scope2026-11-14
cf-198-41-222-35.cloudflare.comIn scope2026-11-14
cf-198-41-222-36.cloudflare.comIn scope2026-11-14
cf-198-41-222-37.cloudflare.comIn scope2026-11-14
cf-198-41-222-38.cloudflare.comIn scope2026-11-14
cf-198-41-222-39.cloudflare.comIn scope2026-11-14
cf-198-41-222-4.cloudflare.comIn scope2026-11-14
cf-198-41-222-40.cloudflare.comIn scope2026-11-14
cf-198-41-222-41.cloudflare.comIn scope2026-11-14
cf-198-41-222-42.cloudflare.comIn scope2026-11-14
cf-198-41-222-43.cloudflare.comIn scope2026-11-14
cf-198-41-222-44.cloudflare.comIn scope2026-11-14
cf-198-41-222-45.cloudflare.comIn scope2026-11-14
cf-198-41-222-46.cloudflare.comIn scope2026-11-14
cf-198-41-222-47.cloudflare.comIn scope2026-11-14
cf-198-41-222-48.cloudflare.comIn scope2026-11-14
cf-198-41-222-49.cloudflare.comIn scope2026-11-14
cf-198-41-222-5.cloudflare.comIn scope2026-11-14
cf-198-41-222-50.cloudflare.comIn scope2026-11-14
cf-198-41-222-51.cloudflare.comIn scope2026-11-14
cf-198-41-222-52.cloudflare.comIn scope2026-11-14
cf-198-41-222-53.cloudflare.comIn scope2026-11-14
cf-198-41-222-54.cloudflare.comIn scope2026-11-14
cf-198-41-222-55.cloudflare.comIn scope2026-11-14
cf-198-41-222-56.cloudflare.comIn scope2026-11-14
cf-198-41-222-57.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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