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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-190-93-243-16.cloudflare.comIn scope2026-11-14
cf-190-93-243-160.cloudflare.comIn scope2026-11-14
cf-190-93-243-161.cloudflare.comIn scope2026-11-14
cf-190-93-243-162.cloudflare.comIn scope2026-11-14
cf-190-93-243-163.cloudflare.comIn scope2026-11-14
cf-190-93-243-164.cloudflare.comIn scope2026-11-14
cf-190-93-243-165.cloudflare.comIn scope2026-11-14
cf-190-93-243-166.cloudflare.comIn scope2026-11-14
cf-190-93-243-167.cloudflare.comIn scope2026-11-14
cf-190-93-243-168.cloudflare.comIn scope2026-11-14
cf-190-93-243-169.cloudflare.comIn scope2026-11-14
cf-190-93-243-17.cloudflare.comIn scope2026-11-14
cf-190-93-243-170.cloudflare.comIn scope2026-11-14
cf-190-93-243-171.cloudflare.comIn scope2026-11-14
cf-190-93-243-172.cloudflare.comIn scope2026-11-14
cf-190-93-243-173.cloudflare.comIn scope2026-11-14
cf-190-93-243-174.cloudflare.comIn scope2026-11-14
cf-190-93-243-175.cloudflare.comIn scope2026-11-14
cf-190-93-243-176.cloudflare.comIn scope2026-11-14
cf-190-93-243-177.cloudflare.comIn scope2026-11-14
cf-190-93-243-178.cloudflare.comIn scope2026-11-14
cf-190-93-243-179.cloudflare.comIn scope2026-11-14
cf-190-93-243-18.cloudflare.comIn scope2026-11-14
cf-190-93-243-180.cloudflare.comIn scope2026-11-14
cf-190-93-243-181.cloudflare.comIn scope2026-11-14
cf-190-93-243-182.cloudflare.comIn scope2026-11-14
cf-190-93-243-183.cloudflare.comIn scope2026-11-14
cf-190-93-243-184.cloudflare.comIn scope2026-11-14
cf-190-93-243-185.cloudflare.comIn scope2026-11-14
cf-190-93-243-186.cloudflare.comIn scope2026-11-14
cf-190-93-243-187.cloudflare.comIn scope2026-11-14
cf-190-93-243-188.cloudflare.comIn scope2026-11-14
cf-190-93-243-189.cloudflare.comIn scope2026-11-14
cf-190-93-243-19.cloudflare.comIn scope2026-11-14
cf-190-93-243-190.cloudflare.comIn scope2026-11-14
cf-190-93-243-191.cloudflare.comIn scope2026-11-14
cf-190-93-243-192.cloudflare.comIn scope2026-11-14
cf-190-93-243-193.cloudflare.comIn scope2026-11-14
cf-190-93-243-194.cloudflare.comIn scope2026-11-14
cf-190-93-243-195.cloudflare.comIn scope2026-11-14
cf-190-93-243-196.cloudflare.comIn scope2026-11-14
cf-190-93-243-197.cloudflare.comIn scope2026-11-14
cf-190-93-243-198.cloudflare.comIn scope2026-11-14
cf-190-93-243-199.cloudflare.comIn scope2026-11-14
cf-190-93-243-20.cloudflare.comIn scope2026-11-14
cf-190-93-243-200.cloudflare.comIn scope2026-11-14
cf-190-93-243-201.cloudflare.comIn scope2026-11-14
cf-190-93-243-202.cloudflare.comIn scope2026-11-14
cf-190-93-243-203.cloudflare.comIn scope2026-11-14
cf-190-93-243-204.cloudflare.comIn scope2026-11-14
cf-190-93-243-205.cloudflare.comIn scope2026-11-14
cf-190-93-243-206.cloudflare.comIn scope2026-11-14
cf-190-93-243-207.cloudflare.comIn scope2026-11-14
cf-190-93-243-208.cloudflare.comIn scope2026-11-14
cf-190-93-243-209.cloudflare.comIn scope2026-11-14
cf-190-93-243-21.cloudflare.comIn scope2026-11-14
cf-190-93-243-210.cloudflare.comIn scope2026-11-14
cf-190-93-243-211.cloudflare.comIn scope2026-11-14
cf-190-93-243-212.cloudflare.comIn scope2026-11-14
cf-190-93-243-213.cloudflare.comIn scope2026-11-14
cf-190-93-243-214.cloudflare.comIn scope2026-11-14
cf-190-93-243-215.cloudflare.comIn scope2026-11-14
cf-190-93-243-216.cloudflare.comIn scope2026-11-14
cf-190-93-243-217.cloudflare.comIn scope2026-11-14
cf-190-93-243-218.cloudflare.comIn scope2026-11-14
cf-190-93-243-219.cloudflare.comIn scope2026-11-14
cf-190-93-243-22.cloudflare.comIn scope2026-11-14
cf-190-93-243-220.cloudflare.comIn scope2026-11-14
cf-190-93-243-221.cloudflare.comIn scope2026-11-14
cf-190-93-243-222.cloudflare.comIn scope2026-11-14
cf-190-93-243-223.cloudflare.comIn scope2026-11-14
cf-190-93-243-224.cloudflare.comIn scope2026-11-14
cf-190-93-243-225.cloudflare.comIn scope2026-11-14
cf-190-93-243-226.cloudflare.comIn scope2026-11-14
cf-190-93-243-227.cloudflare.comIn scope2026-11-14
cf-190-93-243-228.cloudflare.comIn scope2026-11-14
cf-190-93-243-229.cloudflare.comIn scope2026-11-14
cf-190-93-243-23.cloudflare.comIn scope2026-11-14
cf-190-93-243-230.cloudflare.comIn scope2026-11-14
cf-190-93-243-231.cloudflare.comIn scope2026-11-14
cf-190-93-243-232.cloudflare.comIn scope2026-11-14
cf-190-93-243-233.cloudflare.comIn scope2026-11-14
cf-190-93-243-234.cloudflare.comIn scope2026-11-14
cf-190-93-243-235.cloudflare.comIn scope2026-11-14
cf-190-93-243-236.cloudflare.comIn scope2026-11-14
cf-190-93-243-237.cloudflare.comIn scope2026-11-14
cf-190-93-243-238.cloudflare.comIn scope2026-11-14
cf-190-93-243-239.cloudflare.comIn scope2026-11-14
cf-190-93-243-24.cloudflare.comIn scope2026-11-14
cf-190-93-243-240.cloudflare.comIn scope2026-11-14
cf-190-93-243-241.cloudflare.comIn scope2026-11-14
cf-190-93-243-242.cloudflare.comIn scope2026-11-14
cf-190-93-243-243.cloudflare.comIn scope2026-11-14
cf-190-93-243-244.cloudflare.comIn scope2026-11-14
cf-190-93-243-245.cloudflare.comIn scope2026-11-14
cf-190-93-243-246.cloudflare.comIn scope2026-11-14
cf-190-93-243-247.cloudflare.comIn scope2026-11-14
cf-190-93-243-248.cloudflare.comIn scope2026-11-14
cf-190-93-243-249.cloudflare.comIn scope2026-11-14
cf-190-93-243-25.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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