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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-173-245-56-206.cloudflare.comIn scope2026-11-14
cf-173-245-56-207.cloudflare.comIn scope2026-11-14
cf-173-245-56-208.cloudflare.comIn scope2026-11-14
cf-173-245-56-209.cloudflare.comIn scope2026-11-14
cf-173-245-56-21.cloudflare.comIn scope2026-11-14
cf-173-245-56-210.cloudflare.comIn scope2026-11-14
cf-173-245-56-211.cloudflare.comIn scope2026-11-14
cf-173-245-56-212.cloudflare.comIn scope2026-11-14
cf-173-245-56-213.cloudflare.comIn scope2026-11-14
cf-173-245-56-214.cloudflare.comIn scope2026-11-14
cf-173-245-56-215.cloudflare.comIn scope2026-11-14
cf-173-245-56-216.cloudflare.comIn scope2026-11-14
cf-173-245-56-217.cloudflare.comIn scope2026-11-14
cf-173-245-56-218.cloudflare.comIn scope2026-11-14
cf-173-245-56-219.cloudflare.comIn scope2026-11-14
cf-173-245-56-22.cloudflare.comIn scope2026-11-14
cf-173-245-56-220.cloudflare.comIn scope2026-11-14
cf-173-245-56-221.cloudflare.comIn scope2026-11-14
cf-173-245-56-222.cloudflare.comIn scope2026-11-14
cf-173-245-56-223.cloudflare.comIn scope2026-11-14
cf-173-245-56-224.cloudflare.comIn scope2026-11-14
cf-173-245-56-225.cloudflare.comIn scope2026-11-14
cf-173-245-56-226.cloudflare.comIn scope2026-11-14
cf-173-245-56-227.cloudflare.comIn scope2026-11-14
cf-173-245-56-228.cloudflare.comIn scope2026-11-14
cf-173-245-56-229.cloudflare.comIn scope2026-11-14
cf-173-245-56-23.cloudflare.comIn scope2026-11-14
cf-173-245-56-230.cloudflare.comIn scope2026-11-14
cf-173-245-56-231.cloudflare.comIn scope2026-11-14
cf-173-245-56-232.cloudflare.comIn scope2026-11-14
cf-173-245-56-233.cloudflare.comIn scope2026-11-14
cf-173-245-56-234.cloudflare.comIn scope2026-11-14
cf-173-245-56-235.cloudflare.comIn scope2026-11-14
cf-173-245-56-236.cloudflare.comIn scope2026-11-14
cf-173-245-56-237.cloudflare.comIn scope2026-11-14
cf-173-245-56-238.cloudflare.comIn scope2026-11-14
cf-173-245-56-239.cloudflare.comIn scope2026-11-14
cf-173-245-56-240.cloudflare.comIn scope2026-11-14
cf-173-245-56-241.cloudflare.comIn scope2026-11-14
cf-173-245-56-242.cloudflare.comIn scope2026-11-14
cf-173-245-56-243.cloudflare.comIn scope2026-11-14
cf-173-245-56-244.cloudflare.comIn scope2026-11-14
cf-173-245-56-245.cloudflare.comIn scope2026-11-14
cf-173-245-56-246.cloudflare.comIn scope2026-11-14
cf-173-245-56-247.cloudflare.comIn scope2026-11-14
cf-173-245-56-248.cloudflare.comIn scope2026-11-14
cf-173-245-56-249.cloudflare.comIn scope2026-11-14
cf-173-245-56-250.cloudflare.comIn scope2026-11-14
cf-173-245-56-60.cloudflare.comIn scope2026-11-14
cf-173-245-56-61.cloudflare.comIn scope2026-11-14
cf-173-245-56-62.cloudflare.comIn scope2026-11-14
cf-173-245-56-63.cloudflare.comIn scope2026-11-14
cf-173-245-56-64.cloudflare.comIn scope2026-11-14
cf-173-245-56-65.cloudflare.comIn scope2026-11-14
cf-173-245-56-66.cloudflare.comIn scope2026-11-14
cf-173-245-56-67.cloudflare.comIn scope2026-11-14
cf-173-245-56-68.cloudflare.comIn scope2026-11-14
cf-173-245-56-69.cloudflare.comIn scope2026-11-14
cf-173-245-56-70.cloudflare.comIn scope2026-11-14
cf-173-245-56-71.cloudflare.comIn scope2026-11-14
cf-173-245-56-72.cloudflare.comIn scope2026-11-14
cf-173-245-56-73.cloudflare.comIn scope2026-11-14
cf-173-245-56-74.cloudflare.comIn scope2026-11-14
cf-173-245-56-75.cloudflare.comIn scope2026-11-14
cf-173-245-56-76.cloudflare.comIn scope2026-11-14
cf-173-245-56-77.cloudflare.comIn scope2026-11-14
cf-173-245-56-78.cloudflare.comIn scope2026-11-14
cf-173-245-56-79.cloudflare.comIn scope2026-11-14
cf-173-245-56-80.cloudflare.comIn scope2026-11-14
cf-173-245-56-81.cloudflare.comIn scope2026-11-14
cf-173-245-56-82.cloudflare.comIn scope2026-11-14
cf-173-245-56-83.cloudflare.comIn scope2026-11-14
cf-173-245-56-84.cloudflare.comIn scope2026-11-14
cf-173-245-56-85.cloudflare.comIn scope2026-11-14
cf-173-245-56-86.cloudflare.comIn scope2026-11-14
cf-173-245-56-87.cloudflare.comIn scope2026-11-14
cf-173-245-56-88.cloudflare.comIn scope2026-11-14
cf-173-245-56-89.cloudflare.comIn scope2026-11-14
cf-173-245-56-90.cloudflare.comIn scope2026-11-14
cf-173-245-56-91.cloudflare.comIn scope2026-11-14
cf-173-245-56-92.cloudflare.comIn scope2026-11-14
cf-173-245-56-93.cloudflare.comIn scope2026-11-14
cf-173-245-56-94.cloudflare.comIn scope2026-11-14
cf-173-245-56-95.cloudflare.comIn scope2026-11-14
cf-173-245-56-96.cloudflare.comIn scope2026-11-14
cf-173-245-56-97.cloudflare.comIn scope2026-11-14
cf-173-245-56-98.cloudflare.comIn scope2026-11-14
cf-173-245-56-99.cloudflare.comIn scope2026-11-14
cf-173-245-57-110.cloudflare.comIn scope2026-11-14
cf-173-245-57-39.cloudflare.comIn scope2026-11-14
cf-173-245-58-10.cloudflare.comIn scope2026-11-14
cf-173-245-58-11.cloudflare.comIn scope2026-11-14
cf-173-245-58-12.cloudflare.comIn scope2026-11-14
cf-173-245-58-13.cloudflare.comIn scope2026-11-14
cf-173-245-58-14.cloudflare.comIn scope2026-11-14
cf-173-245-58-15.cloudflare.comIn scope2026-11-14
cf-173-245-58-16.cloudflare.comIn scope2026-11-14
cf-173-245-58-17.cloudflare.comIn scope2026-11-14
cf-173-245-58-18.cloudflare.comIn scope2026-11-14
cf-173-245-58-19.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