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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-190-93-252-197.cloudflare.comIn scope2026-11-14
cf-190-93-252-198.cloudflare.comIn scope2026-11-14
cf-190-93-252-199.cloudflare.comIn scope2026-11-14
cf-190-93-252-20.cloudflare.comIn scope2026-11-14
cf-190-93-252-200.cloudflare.comIn scope2026-11-14
cf-190-93-252-201.cloudflare.comIn scope2026-11-14
cf-190-93-252-202.cloudflare.comIn scope2026-11-14
cf-190-93-252-203.cloudflare.comIn scope2026-11-14
cf-190-93-252-204.cloudflare.comIn scope2026-11-14
cf-190-93-252-205.cloudflare.comIn scope2026-11-14
cf-190-93-252-206.cloudflare.comIn scope2026-11-14
cf-190-93-252-207.cloudflare.comIn scope2026-11-14
cf-190-93-252-208.cloudflare.comIn scope2026-11-14
cf-190-93-252-209.cloudflare.comIn scope2026-11-14
cf-190-93-252-21.cloudflare.comIn scope2026-11-14
cf-190-93-252-210.cloudflare.comIn scope2026-11-14
cf-190-93-252-211.cloudflare.comIn scope2026-11-14
cf-190-93-252-212.cloudflare.comIn scope2026-11-14
cf-190-93-252-213.cloudflare.comIn scope2026-11-14
cf-190-93-252-214.cloudflare.comIn scope2026-11-14
cf-190-93-252-215.cloudflare.comIn scope2026-11-14
cf-190-93-252-216.cloudflare.comIn scope2026-11-14
cf-190-93-252-217.cloudflare.comIn scope2026-11-14
cf-190-93-252-218.cloudflare.comIn scope2026-11-14
cf-190-93-252-219.cloudflare.comIn scope2026-11-14
cf-190-93-252-22.cloudflare.comIn scope2026-11-14
cf-190-93-252-220.cloudflare.comIn scope2026-11-14
cf-190-93-252-221.cloudflare.comIn scope2026-11-14
cf-190-93-252-222.cloudflare.comIn scope2026-11-14
cf-190-93-252-223.cloudflare.comIn scope2026-11-14
cf-190-93-252-224.cloudflare.comIn scope2026-11-14
cf-190-93-252-225.cloudflare.comIn scope2026-11-14
cf-190-93-252-226.cloudflare.comIn scope2026-11-14
cf-190-93-252-227.cloudflare.comIn scope2026-11-14
cf-190-93-252-228.cloudflare.comIn scope2026-11-14
cf-190-93-252-229.cloudflare.comIn scope2026-11-14
cf-190-93-252-23.cloudflare.comIn scope2026-11-14
cf-190-93-252-230.cloudflare.comIn scope2026-11-14
cf-190-93-252-231.cloudflare.comIn scope2026-11-14
cf-190-93-252-232.cloudflare.comIn scope2026-11-14
cf-190-93-252-233.cloudflare.comIn scope2026-11-14
cf-190-93-252-234.cloudflare.comIn scope2026-11-14
cf-190-93-252-235.cloudflare.comIn scope2026-11-14
cf-190-93-252-236.cloudflare.comIn scope2026-11-14
cf-190-93-252-237.cloudflare.comIn scope2026-11-14
cf-190-93-252-238.cloudflare.comIn scope2026-11-14
cf-190-93-252-239.cloudflare.comIn scope2026-11-14
cf-190-93-252-24.cloudflare.comIn scope2026-11-14
cf-190-93-252-240.cloudflare.comIn scope2026-11-14
cf-190-93-252-241.cloudflare.comIn scope2026-11-14
cf-190-93-252-242.cloudflare.comIn scope2026-11-14
cf-190-93-252-243.cloudflare.comIn scope2026-11-14
cf-190-93-252-244.cloudflare.comIn scope2026-11-14
cf-190-93-252-245.cloudflare.comIn scope2026-11-14
cf-190-93-252-246.cloudflare.comIn scope2026-11-14
cf-190-93-252-247.cloudflare.comIn scope2026-11-14
cf-190-93-252-248.cloudflare.comIn scope2026-11-14
cf-190-93-252-249.cloudflare.comIn scope2026-11-14
cf-190-93-252-25.cloudflare.comIn scope2026-11-14
cf-190-93-252-250.cloudflare.comIn scope2026-11-14
cf-190-93-252-251.cloudflare.comIn scope2026-11-14
cf-190-93-252-252.cloudflare.comIn scope2026-11-14
cf-190-93-252-253.cloudflare.comIn scope2026-11-14
cf-190-93-252-254.cloudflare.comIn scope2026-11-14
cf-190-93-252-26.cloudflare.comIn scope2026-11-14
cf-190-93-252-27.cloudflare.comIn scope2026-11-14
cf-190-93-252-28.cloudflare.comIn scope2026-11-14
cf-190-93-252-29.cloudflare.comIn scope2026-11-14
cf-190-93-252-30.cloudflare.comIn scope2026-11-14
cf-190-93-252-31.cloudflare.comIn scope2026-11-14
cf-190-93-252-32.cloudflare.comIn scope2026-11-14
cf-190-93-252-33.cloudflare.comIn scope2026-11-14
cf-190-93-252-34.cloudflare.comIn scope2026-11-14
cf-190-93-252-35.cloudflare.comIn scope2026-11-14
cf-190-93-252-36.cloudflare.comIn scope2026-11-14
cf-190-93-252-37.cloudflare.comIn scope2026-11-14
cf-190-93-252-38.cloudflare.comIn scope2026-11-14
cf-190-93-252-39.cloudflare.comIn scope2026-11-14
cf-190-93-252-4.cloudflare.comIn scope2026-11-14
cf-190-93-252-40.cloudflare.comIn scope2026-11-14
cf-190-93-252-41.cloudflare.comIn scope2026-11-14
cf-190-93-252-42.cloudflare.comIn scope2026-11-14
cf-190-93-252-43.cloudflare.comIn scope2026-11-14
cf-190-93-252-44.cloudflare.comIn scope2026-11-14
cf-190-93-252-45.cloudflare.comIn scope2026-11-14
cf-190-93-252-46.cloudflare.comIn scope2026-11-14
cf-190-93-252-47.cloudflare.comIn scope2026-11-14
cf-190-93-252-48.cloudflare.comIn scope2026-11-14
cf-190-93-252-49.cloudflare.comIn scope2026-11-14
cf-190-93-252-5.cloudflare.comIn scope2026-11-14
cf-190-93-252-50.cloudflare.comIn scope2026-11-14
cf-190-93-252-51.cloudflare.comIn scope2026-11-14
cf-190-93-252-52.cloudflare.comIn scope2026-11-14
cf-190-93-252-53.cloudflare.comIn scope2026-11-14
cf-190-93-252-54.cloudflare.comIn scope2026-11-14
cf-190-93-252-55.cloudflare.comIn scope2026-11-14
cf-190-93-252-56.cloudflare.comIn scope2026-11-14
cf-190-93-252-57.cloudflare.comIn scope2026-11-14
cf-190-93-252-58.cloudflare.comIn scope2026-11-14
cf-190-93-252-59.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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