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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-190-93-250-199.cloudflare.comIn scope2026-11-14
cf-190-93-250-20.cloudflare.comIn scope2026-11-14
cf-190-93-250-200.cloudflare.comIn scope2026-11-14
cf-190-93-250-201.cloudflare.comIn scope2026-11-14
cf-190-93-250-202.cloudflare.comIn scope2026-11-14
cf-190-93-250-203.cloudflare.comIn scope2026-11-14
cf-190-93-250-204.cloudflare.comIn scope2026-11-14
cf-190-93-250-205.cloudflare.comIn scope2026-11-14
cf-190-93-250-206.cloudflare.comIn scope2026-11-14
cf-190-93-250-207.cloudflare.comIn scope2026-11-14
cf-190-93-250-208.cloudflare.comIn scope2026-11-14
cf-190-93-250-209.cloudflare.comIn scope2026-11-14
cf-190-93-250-21.cloudflare.comIn scope2026-11-14
cf-190-93-250-210.cloudflare.comIn scope2026-11-14
cf-190-93-250-211.cloudflare.comIn scope2026-11-14
cf-190-93-250-212.cloudflare.comIn scope2026-11-14
cf-190-93-250-213.cloudflare.comIn scope2026-11-14
cf-190-93-250-214.cloudflare.comIn scope2026-11-14
cf-190-93-250-215.cloudflare.comIn scope2026-11-14
cf-190-93-250-216.cloudflare.comIn scope2026-11-14
cf-190-93-250-217.cloudflare.comIn scope2026-11-14
cf-190-93-250-218.cloudflare.comIn scope2026-11-14
cf-190-93-250-219.cloudflare.comIn scope2026-11-14
cf-190-93-250-22.cloudflare.comIn scope2026-11-14
cf-190-93-250-220.cloudflare.comIn scope2026-11-14
cf-190-93-250-221.cloudflare.comIn scope2026-11-14
cf-190-93-250-222.cloudflare.comIn scope2026-11-14
cf-190-93-250-223.cloudflare.comIn scope2026-11-14
cf-190-93-250-224.cloudflare.comIn scope2026-11-14
cf-190-93-250-225.cloudflare.comIn scope2026-11-14
cf-190-93-250-226.cloudflare.comIn scope2026-11-14
cf-190-93-250-227.cloudflare.comIn scope2026-11-14
cf-190-93-250-228.cloudflare.comIn scope2026-11-14
cf-190-93-250-229.cloudflare.comIn scope2026-11-14
cf-190-93-250-23.cloudflare.comIn scope2026-11-14
cf-190-93-250-230.cloudflare.comIn scope2026-11-14
cf-190-93-250-231.cloudflare.comIn scope2026-11-14
cf-190-93-250-232.cloudflare.comIn scope2026-11-14
cf-190-93-250-233.cloudflare.comIn scope2026-11-14
cf-190-93-250-234.cloudflare.comIn scope2026-11-14
cf-190-93-250-235.cloudflare.comIn scope2026-11-14
cf-190-93-250-236.cloudflare.comIn scope2026-11-14
cf-190-93-250-237.cloudflare.comIn scope2026-11-14
cf-190-93-250-238.cloudflare.comIn scope2026-11-14
cf-190-93-250-239.cloudflare.comIn scope2026-11-14
cf-190-93-250-24.cloudflare.comIn scope2026-11-14
cf-190-93-250-240.cloudflare.comIn scope2026-11-14
cf-190-93-250-241.cloudflare.comIn scope2026-11-14
cf-190-93-250-242.cloudflare.comIn scope2026-11-14
cf-190-93-250-243.cloudflare.comIn scope2026-11-14
cf-190-93-250-244.cloudflare.comIn scope2026-11-14
cf-190-93-250-245.cloudflare.comIn scope2026-11-14
cf-190-93-250-246.cloudflare.comIn scope2026-11-14
cf-190-93-250-247.cloudflare.comIn scope2026-11-14
cf-190-93-250-248.cloudflare.comIn scope2026-11-14
cf-190-93-250-249.cloudflare.comIn scope2026-11-14
cf-190-93-250-25.cloudflare.comIn scope2026-11-14
cf-190-93-250-250.cloudflare.comIn scope2026-11-14
cf-190-93-250-251.cloudflare.comIn scope2026-11-14
cf-190-93-250-252.cloudflare.comIn scope2026-11-14
cf-190-93-250-253.cloudflare.comIn scope2026-11-14
cf-190-93-250-254.cloudflare.comIn scope2026-11-14
cf-190-93-250-26.cloudflare.comIn scope2026-11-14
cf-190-93-250-27.cloudflare.comIn scope2026-11-14
cf-190-93-250-28.cloudflare.comIn scope2026-11-14
cf-190-93-250-29.cloudflare.comIn scope2026-11-14
cf-190-93-250-30.cloudflare.comIn scope2026-11-14
cf-190-93-250-31.cloudflare.comIn scope2026-11-14
cf-190-93-250-32.cloudflare.comIn scope2026-11-14
cf-190-93-250-33.cloudflare.comIn scope2026-11-14
cf-190-93-250-34.cloudflare.comIn scope2026-11-14
cf-190-93-250-35.cloudflare.comIn scope2026-11-14
cf-190-93-250-36.cloudflare.comIn scope2026-11-14
cf-190-93-250-37.cloudflare.comIn scope2026-11-14
cf-190-93-250-38.cloudflare.comIn scope2026-11-14
cf-190-93-250-39.cloudflare.comIn scope2026-11-14
cf-190-93-250-4.cloudflare.comIn scope2026-11-14
cf-190-93-250-40.cloudflare.comIn scope2026-11-14
cf-190-93-250-41.cloudflare.comIn scope2026-11-14
cf-190-93-250-42.cloudflare.comIn scope2026-11-14
cf-190-93-250-43.cloudflare.comIn scope2026-11-14
cf-190-93-250-44.cloudflare.comIn scope2026-11-14
cf-190-93-250-45.cloudflare.comIn scope2026-11-14
cf-190-93-250-46.cloudflare.comIn scope2026-11-14
cf-190-93-250-47.cloudflare.comIn scope2026-11-14
cf-190-93-250-48.cloudflare.comIn scope2026-11-14
cf-190-93-250-49.cloudflare.comIn scope2026-11-14
cf-190-93-250-5.cloudflare.comIn scope2026-11-14
cf-190-93-250-50.cloudflare.comIn scope2026-11-14
cf-190-93-250-51.cloudflare.comIn scope2026-11-14
cf-190-93-250-52.cloudflare.comIn scope2026-11-14
cf-190-93-250-53.cloudflare.comIn scope2026-11-14
cf-190-93-250-54.cloudflare.comIn scope2026-11-14
cf-190-93-250-55.cloudflare.comIn scope2026-11-14
cf-190-93-250-56.cloudflare.comIn scope2026-11-14
cf-190-93-250-57.cloudflare.comIn scope2026-11-14
cf-190-93-250-58.cloudflare.comIn scope2026-11-14
cf-190-93-250-59.cloudflare.comIn scope2026-11-14
cf-190-93-250-6.cloudflare.comIn scope2026-11-14
cf-190-93-250-60.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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