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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-173-245-58-20.cloudflare.comIn scope2026-11-14
cf-173-245-58-21.cloudflare.comIn scope2026-11-14
cf-173-245-58-22.cloudflare.comIn scope2026-11-14
cf-173-245-58-23.cloudflare.comIn scope2026-11-14
cf-173-245-58-24.cloudflare.comIn scope2026-11-14
cf-173-245-58-25.cloudflare.comIn scope2026-11-14
cf-173-245-58-26.cloudflare.comIn scope2026-11-14
cf-173-245-58-27.cloudflare.comIn scope2026-11-14
cf-173-245-58-28.cloudflare.comIn scope2026-11-14
cf-173-245-58-29.cloudflare.comIn scope2026-11-14
cf-173-245-58-30.cloudflare.comIn scope2026-11-14
cf-173-245-58-31.cloudflare.comIn scope2026-11-14
cf-173-245-58-32.cloudflare.comIn scope2026-11-14
cf-173-245-58-33.cloudflare.comIn scope2026-11-14
cf-173-245-58-34.cloudflare.comIn scope2026-11-14
cf-173-245-58-35.cloudflare.comIn scope2026-11-14
cf-173-245-58-36.cloudflare.comIn scope2026-11-14
cf-173-245-58-37.cloudflare.comIn scope2026-11-14
cf-173-245-58-38.cloudflare.comIn scope2026-11-14
cf-173-245-58-39.cloudflare.comIn scope2026-11-14
cf-173-245-58-4.cloudflare.comIn scope2026-11-14
cf-173-245-58-40.cloudflare.comIn scope2026-11-14
cf-173-245-58-41.cloudflare.comIn scope2026-11-14
cf-173-245-58-42.cloudflare.comIn scope2026-11-14
cf-173-245-58-43.cloudflare.comIn scope2026-11-14
cf-173-245-58-44.cloudflare.comIn scope2026-11-14
cf-173-245-58-45.cloudflare.comIn scope2026-11-14
cf-173-245-58-46.cloudflare.comIn scope2026-11-14
cf-173-245-58-47.cloudflare.comIn scope2026-11-14
cf-173-245-58-48.cloudflare.comIn scope2026-11-14
cf-173-245-58-49.cloudflare.comIn scope2026-11-14
cf-173-245-58-5.cloudflare.comIn scope2026-11-14
cf-173-245-58-50.cloudflare.comIn scope2026-11-14
cf-173-245-58-52.cloudflare.comIn scope2026-11-14
cf-173-245-58-53.cloudflare.comIn scope2026-11-14
cf-173-245-58-6.cloudflare.comIn scope2026-11-14
cf-173-245-58-7.cloudflare.comIn scope2026-11-14
cf-173-245-58-8.cloudflare.comIn scope2026-11-14
cf-173-245-58-9.cloudflare.comIn scope2026-11-14
cf-173-245-59-10.cloudflare.comIn scope2026-11-14
cf-173-245-59-11.cloudflare.comIn scope2026-11-14
cf-173-245-59-12.cloudflare.comIn scope2026-11-14
cf-173-245-59-13.cloudflare.comIn scope2026-11-14
cf-173-245-59-14.cloudflare.comIn scope2026-11-14
cf-173-245-59-15.cloudflare.comIn scope2026-11-14
cf-173-245-59-16.cloudflare.comIn scope2026-11-14
cf-173-245-59-17.cloudflare.comIn scope2026-11-14
cf-173-245-59-18.cloudflare.comIn scope2026-11-14
cf-173-245-59-19.cloudflare.comIn scope2026-11-14
cf-173-245-59-20.cloudflare.comIn scope2026-11-14
cf-173-245-59-21.cloudflare.comIn scope2026-11-14
cf-173-245-59-22.cloudflare.comIn scope2026-11-14
cf-173-245-59-23.cloudflare.comIn scope2026-11-14
cf-173-245-59-24.cloudflare.comIn scope2026-11-14
cf-173-245-59-25.cloudflare.comIn scope2026-11-14
cf-173-245-59-26.cloudflare.comIn scope2026-11-14
cf-173-245-59-27.cloudflare.comIn scope2026-11-14
cf-173-245-59-28.cloudflare.comIn scope2026-11-14
cf-173-245-59-29.cloudflare.comIn scope2026-11-14
cf-173-245-59-30.cloudflare.comIn scope2026-11-14
cf-173-245-59-31.cloudflare.comIn scope2026-11-14
cf-173-245-59-32.cloudflare.comIn scope2026-11-14
cf-173-245-59-33.cloudflare.comIn scope2026-11-14
cf-173-245-59-34.cloudflare.comIn scope2026-11-14
cf-173-245-59-35.cloudflare.comIn scope2026-11-14
cf-173-245-59-36.cloudflare.comIn scope2026-11-14
cf-173-245-59-37.cloudflare.comIn scope2026-11-14
cf-173-245-59-38.cloudflare.comIn scope2026-11-14
cf-173-245-59-39.cloudflare.comIn scope2026-11-14
cf-173-245-59-4.cloudflare.comIn scope2026-11-14
cf-173-245-59-40.cloudflare.comIn scope2026-11-14
cf-173-245-59-42.cloudflare.comIn scope2026-11-14
cf-173-245-59-43.cloudflare.comIn scope2026-11-14
cf-173-245-59-44.cloudflare.comIn scope2026-11-14
cf-173-245-59-45.cloudflare.comIn scope2026-11-14
cf-173-245-59-46.cloudflare.comIn scope2026-11-14
cf-173-245-59-47.cloudflare.comIn scope2026-11-14
cf-173-245-59-48.cloudflare.comIn scope2026-11-14
cf-173-245-59-49.cloudflare.comIn scope2026-11-14
cf-173-245-59-5.cloudflare.comIn scope2026-11-14
cf-173-245-59-50.cloudflare.comIn scope2026-11-14
cf-173-245-59-51.cloudflare.comIn scope2026-11-14
cf-173-245-59-52.cloudflare.comIn scope2026-11-14
cf-173-245-59-53.cloudflare.comIn scope2026-11-14
cf-173-245-59-6.cloudflare.comIn scope2026-11-14
cf-173-245-59-7.cloudflare.comIn scope2026-11-14
cf-173-245-59-8.cloudflare.comIn scope2026-11-14
cf-173-245-59-9.cloudflare.comIn scope2026-11-14
cf-173-245-60-10.cloudflare.comIn scope2026-11-14
cf-173-245-60-100.cloudflare.comIn scope2026-11-14
cf-173-245-60-101.cloudflare.comIn scope2026-11-14
cf-173-245-60-102.cloudflare.comIn scope2026-11-14
cf-173-245-60-103.cloudflare.comIn scope2026-11-14
cf-173-245-60-104.cloudflare.comIn scope2026-11-14
cf-173-245-60-105.cloudflare.comIn scope2026-11-14
cf-173-245-60-106.cloudflare.comIn scope2026-11-14
cf-173-245-60-107.cloudflare.comIn scope2026-11-14
cf-173-245-60-108.cloudflare.comIn scope2026-11-14
cf-173-245-60-109.cloudflare.comIn scope2026-11-14
cf-173-245-60-11.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