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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-190-93-247-156.cloudflare.comIn scope2026-11-14
cf-190-93-247-157.cloudflare.comIn scope2026-11-14
cf-190-93-247-158.cloudflare.comIn scope2026-11-14
cf-190-93-247-159.cloudflare.comIn scope2026-11-14
cf-190-93-247-16.cloudflare.comIn scope2026-11-14
cf-190-93-247-160.cloudflare.comIn scope2026-11-14
cf-190-93-247-161.cloudflare.comIn scope2026-11-14
cf-190-93-247-162.cloudflare.comIn scope2026-11-14
cf-190-93-247-163.cloudflare.comIn scope2026-11-14
cf-190-93-247-164.cloudflare.comIn scope2026-11-14
cf-190-93-247-165.cloudflare.comIn scope2026-11-14
cf-190-93-247-166.cloudflare.comIn scope2026-11-14
cf-190-93-247-167.cloudflare.comIn scope2026-11-14
cf-190-93-247-168.cloudflare.comIn scope2026-11-14
cf-190-93-247-169.cloudflare.comIn scope2026-11-14
cf-190-93-247-17.cloudflare.comIn scope2026-11-14
cf-190-93-247-170.cloudflare.comIn scope2026-11-14
cf-190-93-247-171.cloudflare.comIn scope2026-11-14
cf-190-93-247-172.cloudflare.comIn scope2026-11-14
cf-190-93-247-173.cloudflare.comIn scope2026-11-14
cf-190-93-247-174.cloudflare.comIn scope2026-11-14
cf-190-93-247-175.cloudflare.comIn scope2026-11-14
cf-190-93-247-176.cloudflare.comIn scope2026-11-14
cf-190-93-247-177.cloudflare.comIn scope2026-11-14
cf-190-93-247-178.cloudflare.comIn scope2026-11-14
cf-190-93-247-179.cloudflare.comIn scope2026-11-14
cf-190-93-247-18.cloudflare.comIn scope2026-11-14
cf-190-93-247-180.cloudflare.comIn scope2026-11-14
cf-190-93-247-181.cloudflare.comIn scope2026-11-14
cf-190-93-247-182.cloudflare.comIn scope2026-11-14
cf-190-93-247-183.cloudflare.comIn scope2026-11-14
cf-190-93-247-184.cloudflare.comIn scope2026-11-14
cf-190-93-247-185.cloudflare.comIn scope2026-11-14
cf-190-93-247-186.cloudflare.comIn scope2026-11-14
cf-190-93-247-187.cloudflare.comIn scope2026-11-14
cf-190-93-247-188.cloudflare.comIn scope2026-11-14
cf-190-93-247-189.cloudflare.comIn scope2026-11-14
cf-190-93-247-19.cloudflare.comIn scope2026-11-14
cf-190-93-247-190.cloudflare.comIn scope2026-11-14
cf-190-93-247-191.cloudflare.comIn scope2026-11-14
cf-190-93-247-192.cloudflare.comIn scope2026-11-14
cf-190-93-247-193.cloudflare.comIn scope2026-11-14
cf-190-93-247-194.cloudflare.comIn scope2026-11-14
cf-190-93-247-195.cloudflare.comIn scope2026-11-14
cf-190-93-247-196.cloudflare.comIn scope2026-11-14
cf-190-93-247-197.cloudflare.comIn scope2026-11-14
cf-190-93-247-198.cloudflare.comIn scope2026-11-14
cf-190-93-247-199.cloudflare.comIn scope2026-11-14
cf-190-93-247-20.cloudflare.comIn scope2026-11-14
cf-190-93-247-200.cloudflare.comIn scope2026-11-14
cf-190-93-247-201.cloudflare.comIn scope2026-11-14
cf-190-93-247-202.cloudflare.comIn scope2026-11-14
cf-190-93-247-203.cloudflare.comIn scope2026-11-14
cf-190-93-247-204.cloudflare.comIn scope2026-11-14
cf-190-93-247-205.cloudflare.comIn scope2026-11-14
cf-190-93-247-206.cloudflare.comIn scope2026-11-14
cf-190-93-247-207.cloudflare.comIn scope2026-11-14
cf-190-93-247-208.cloudflare.comIn scope2026-11-14
cf-190-93-247-209.cloudflare.comIn scope2026-11-14
cf-190-93-247-21.cloudflare.comIn scope2026-11-14
cf-190-93-247-210.cloudflare.comIn scope2026-11-14
cf-190-93-247-211.cloudflare.comIn scope2026-11-14
cf-190-93-247-212.cloudflare.comIn scope2026-11-14
cf-190-93-247-213.cloudflare.comIn scope2026-11-14
cf-190-93-247-214.cloudflare.comIn scope2026-11-14
cf-190-93-247-215.cloudflare.comIn scope2026-11-14
cf-190-93-247-216.cloudflare.comIn scope2026-11-14
cf-190-93-247-217.cloudflare.comIn scope2026-11-14
cf-190-93-247-218.cloudflare.comIn scope2026-11-14
cf-190-93-247-219.cloudflare.comIn scope2026-11-14
cf-190-93-247-22.cloudflare.comIn scope2026-11-14
cf-190-93-247-220.cloudflare.comIn scope2026-11-14
cf-190-93-247-221.cloudflare.comIn scope2026-11-14
cf-190-93-247-222.cloudflare.comIn scope2026-11-14
cf-190-93-247-223.cloudflare.comIn scope2026-11-14
cf-190-93-247-224.cloudflare.comIn scope2026-11-14
cf-190-93-247-225.cloudflare.comIn scope2026-11-14
cf-190-93-247-226.cloudflare.comIn scope2026-11-14
cf-190-93-247-227.cloudflare.comIn scope2026-11-14
cf-190-93-247-228.cloudflare.comIn scope2026-11-14
cf-190-93-247-229.cloudflare.comIn scope2026-11-14
cf-190-93-247-23.cloudflare.comIn scope2026-11-14
cf-190-93-247-230.cloudflare.comIn scope2026-11-14
cf-190-93-247-231.cloudflare.comIn scope2026-11-14
cf-190-93-247-232.cloudflare.comIn scope2026-11-14
cf-190-93-247-233.cloudflare.comIn scope2026-11-14
cf-190-93-247-234.cloudflare.comIn scope2026-11-14
cf-190-93-247-235.cloudflare.comIn scope2026-11-14
cf-190-93-247-236.cloudflare.comIn scope2026-11-14
cf-190-93-247-237.cloudflare.comIn scope2026-11-14
cf-190-93-247-238.cloudflare.comIn scope2026-11-14
cf-190-93-247-239.cloudflare.comIn scope2026-11-14
cf-190-93-247-24.cloudflare.comIn scope2026-11-14
cf-190-93-247-240.cloudflare.comIn scope2026-11-14
cf-190-93-247-241.cloudflare.comIn scope2026-11-14
cf-190-93-247-242.cloudflare.comIn scope2026-11-14
cf-190-93-247-243.cloudflare.comIn scope2026-11-14
cf-190-93-247-244.cloudflare.comIn scope2026-11-14
cf-190-93-247-245.cloudflare.comIn scope2026-11-14
cf-190-93-247-246.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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