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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-173-245-61-16.cloudflare.comIn scope2026-11-14
cf-173-245-61-160.cloudflare.comIn scope2026-11-14
cf-173-245-61-161.cloudflare.comIn scope2026-11-14
cf-173-245-61-162.cloudflare.comIn scope2026-11-14
cf-173-245-61-163.cloudflare.comIn scope2026-11-14
cf-173-245-61-164.cloudflare.comIn scope2026-11-14
cf-173-245-61-165.cloudflare.comIn scope2026-11-14
cf-173-245-61-166.cloudflare.comIn scope2026-11-14
cf-173-245-61-167.cloudflare.comIn scope2026-11-14
cf-173-245-61-168.cloudflare.comIn scope2026-11-14
cf-173-245-61-169.cloudflare.comIn scope2026-11-14
cf-173-245-61-17.cloudflare.comIn scope2026-11-14
cf-173-245-61-170.cloudflare.comIn scope2026-11-14
cf-173-245-61-171.cloudflare.comIn scope2026-11-14
cf-173-245-61-172.cloudflare.comIn scope2026-11-14
cf-173-245-61-173.cloudflare.comIn scope2026-11-14
cf-173-245-61-174.cloudflare.comIn scope2026-11-14
cf-173-245-61-175.cloudflare.comIn scope2026-11-14
cf-173-245-61-176.cloudflare.comIn scope2026-11-14
cf-173-245-61-177.cloudflare.comIn scope2026-11-14
cf-173-245-61-178.cloudflare.comIn scope2026-11-14
cf-173-245-61-179.cloudflare.comIn scope2026-11-14
cf-173-245-61-18.cloudflare.comIn scope2026-11-14
cf-173-245-61-180.cloudflare.comIn scope2026-11-14
cf-173-245-61-181.cloudflare.comIn scope2026-11-14
cf-173-245-61-182.cloudflare.comIn scope2026-11-14
cf-173-245-61-183.cloudflare.comIn scope2026-11-14
cf-173-245-61-184.cloudflare.comIn scope2026-11-14
cf-173-245-61-185.cloudflare.comIn scope2026-11-14
cf-173-245-61-186.cloudflare.comIn scope2026-11-14
cf-173-245-61-187.cloudflare.comIn scope2026-11-14
cf-173-245-61-188.cloudflare.comIn scope2026-11-14
cf-173-245-61-189.cloudflare.comIn scope2026-11-14
cf-173-245-61-19.cloudflare.comIn scope2026-11-14
cf-173-245-61-190.cloudflare.comIn scope2026-11-14
cf-173-245-61-191.cloudflare.comIn scope2026-11-14
cf-173-245-61-192.cloudflare.comIn scope2026-11-14
cf-173-245-61-193.cloudflare.comIn scope2026-11-14
cf-173-245-61-194.cloudflare.comIn scope2026-11-14
cf-173-245-61-195.cloudflare.comIn scope2026-11-14
cf-173-245-61-196.cloudflare.comIn scope2026-11-14
cf-173-245-61-197.cloudflare.comIn scope2026-11-14
cf-173-245-61-198.cloudflare.comIn scope2026-11-14
cf-173-245-61-199.cloudflare.comIn scope2026-11-14
cf-173-245-61-20.cloudflare.comIn scope2026-11-14
cf-173-245-61-200.cloudflare.comIn scope2026-11-14
cf-173-245-61-201.cloudflare.comIn scope2026-11-14
cf-173-245-61-202.cloudflare.comIn scope2026-11-14
cf-173-245-61-203.cloudflare.comIn scope2026-11-14
cf-173-245-61-204.cloudflare.comIn scope2026-11-14
cf-173-245-61-205.cloudflare.comIn scope2026-11-14
cf-173-245-61-206.cloudflare.comIn scope2026-11-14
cf-173-245-61-207.cloudflare.comIn scope2026-11-14
cf-173-245-61-208.cloudflare.comIn scope2026-11-14
cf-173-245-61-209.cloudflare.comIn scope2026-11-14
cf-173-245-61-21.cloudflare.comIn scope2026-11-14
cf-173-245-61-210.cloudflare.comIn scope2026-11-14
cf-173-245-61-211.cloudflare.comIn scope2026-11-14
cf-173-245-61-212.cloudflare.comIn scope2026-11-14
cf-173-245-61-213.cloudflare.comIn scope2026-11-14
cf-173-245-61-214.cloudflare.comIn scope2026-11-14
cf-173-245-61-215.cloudflare.comIn scope2026-11-14
cf-173-245-61-216.cloudflare.comIn scope2026-11-14
cf-173-245-61-217.cloudflare.comIn scope2026-11-14
cf-173-245-61-218.cloudflare.comIn scope2026-11-14
cf-173-245-61-219.cloudflare.comIn scope2026-11-14
cf-173-245-61-22.cloudflare.comIn scope2026-11-14
cf-173-245-61-220.cloudflare.comIn scope2026-11-14
cf-173-245-61-221.cloudflare.comIn scope2026-11-14
cf-173-245-61-222.cloudflare.comIn scope2026-11-14
cf-173-245-61-223.cloudflare.comIn scope2026-11-14
cf-173-245-61-224.cloudflare.comIn scope2026-11-14
cf-173-245-61-225.cloudflare.comIn scope2026-11-14
cf-173-245-61-226.cloudflare.comIn scope2026-11-14
cf-173-245-61-227.cloudflare.comIn scope2026-11-14
cf-173-245-61-228.cloudflare.comIn scope2026-11-14
cf-173-245-61-229.cloudflare.comIn scope2026-11-14
cf-173-245-61-23.cloudflare.comIn scope2026-11-14
cf-173-245-61-230.cloudflare.comIn scope2026-11-14
cf-173-245-61-231.cloudflare.comIn scope2026-11-14
cf-173-245-61-232.cloudflare.comIn scope2026-11-14
cf-173-245-61-233.cloudflare.comIn scope2026-11-14
cf-173-245-61-234.cloudflare.comIn scope2026-11-14
cf-173-245-61-235.cloudflare.comIn scope2026-11-14
cf-173-245-61-236.cloudflare.comIn scope2026-11-14
cf-173-245-61-237.cloudflare.comIn scope2026-11-14
cf-173-245-61-238.cloudflare.comIn scope2026-11-14
cf-173-245-61-239.cloudflare.comIn scope2026-11-14
cf-173-245-61-24.cloudflare.comIn scope2026-11-14
cf-173-245-61-240.cloudflare.comIn scope2026-11-14
cf-173-245-61-241.cloudflare.comIn scope2026-11-14
cf-173-245-61-242.cloudflare.comIn scope2026-11-14
cf-173-245-61-243.cloudflare.comIn scope2026-11-14
cf-173-245-61-244.cloudflare.comIn scope2026-11-14
cf-173-245-61-245.cloudflare.comIn scope2026-11-14
cf-173-245-61-246.cloudflare.comIn scope2026-11-14
cf-173-245-61-247.cloudflare.comIn scope2026-11-14
cf-173-245-61-248.cloudflare.comIn scope2026-11-14
cf-173-245-61-249.cloudflare.comIn scope2026-11-14
cf-173-245-61-25.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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Updated