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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
fay2.ns.cloudflare.comIn scope2026-11-14
faye.ns.cloudflare.comIn scope2026-11-14
felicity.ns.cloudflare.comIn scope2026-11-14
felipe.ns.cloudflare.comIn scope2026-11-14
felle.ns.cloudflare.comIn scope2026-11-14
finley.ns.cloudflare.comIn scope2026-11-14
fiona.ns.cloudflare.comIn scope2026-11-14
root.fiona.ns.cloudflare.comIn scope2026-11-14
fiora.ns.cloudflare.comIn scope2026-11-14
fish.ns.cloudflare.comIn scope2026-11-14
fliv.ns.cloudflare.comIn scope2026-11-14
fmitch.ns.cloudflare.comIn scope2026-11-14
fonzie.ns.cloudflare.comIn scope2026-11-14
frace.ns.cloudflare.comIn scope2026-11-14
franck.ns.cloudflare.comIn scope2026-11-14
frank.ns.cloudflare.comIn scope2026-11-14
franks.ns.cloudflare.comIn scope2026-11-14
fred.ns.cloudflare.comIn scope2026-11-14
frida.ns.cloudflare.comIn scope2026-11-14
gabe.ns.cloudflare.comIn scope2026-11-14
gabriel.ns.cloudflare.comIn scope2026-11-14
gabriella.ns.cloudflare.comIn scope2026-11-14
gail.ns.cloudflare.comIn scope2026-11-14
galilea.ns.cloudflare.comIn scope2026-11-14
gannon.ns.cloudflare.comIn scope2026-11-14
ganz.ns.cloudflare.comIn scope2026-11-14
garret.ns.cloudflare.comIn scope2026-11-14
garrett.ns.cloudflare.comIn scope2026-11-14
gemma.ns.cloudflare.comIn scope2026-11-14
gen.ns.cloudflare.comIn scope2026-11-14
gene.ns.cloudflare.comIn scope2026-11-14
genie.ns.cloudflare.comIn scope2026-11-14
george.ns.cloudflare.comIn scope2026-11-14
georgia.ns.cloudflare.comIn scope2026-11-14
gerald.ns.cloudflare.comIn scope2026-11-14
gerardo.ns.cloudflare.comIn scope2026-11-14
giancarlo.ns.cloudflare.comIn scope2026-11-14
gigi.ns.cloudflare.comIn scope2026-11-14
gina.ns.cloudflare.comIn scope2026-11-14
glen.ns.cloudflare.comIn scope2026-11-14
gloria.ns.cloudflare.comIn scope2026-11-14
glory.ns.cloudflare.comIn scope2026-11-14
gordon.ns.cloudflare.comIn scope2026-11-14
grace.ns.cloudflare.comIn scope2026-11-14
gracie.ns.cloudflare.comIn scope2026-11-14
graham.ns.cloudflare.comIn scope2026-11-14
grannbo.ns.cloudflare.comIn scope2026-11-14
grant.ns.cloudflare.comIn scope2026-11-14
greg.ns.cloudflare.comIn scope2026-11-14
gus.ns.cloudflare.comIn scope2026-11-14
guss.ns.cloudflare.comIn scope2026-11-14
guy.ns.cloudflare.comIn scope2026-11-14
nia.guy.ns.cloudflare.comIn scope2026-11-14
guys.ns.cloudflare.comIn scope2026-11-14
gwen.ns.cloudflare.comIn scope2026-11-14
ha1.ns.cloudflare.comIn scope2026-11-14
hadlee.ns.cloudflare.comIn scope2026-11-14
hal.ns.cloudflare.comIn scope2026-11-14
halbarad.ns.cloudflare.comIn scope2026-11-14
haley.ns.cloudflare.comIn scope2026-11-14
hank.ns.cloudflare.comIn scope2026-11-14
hans.ns.cloudflare.comIn scope2026-11-14
hostmaster.hans.ns.cloudflare.comIn scope2026-11-14
harlan.ns.cloudflare.comIn scope2026-11-14
harlee.ns.cloudflare.comIn scope2026-11-14
harleigh.ns.cloudflare.comIn scope2026-11-14
harley.ns.cloudflare.comIn scope2026-11-14
harmony.ns.cloudflare.comIn scope2026-11-14
harvey.ns.cloudflare.comIn scope2026-11-14
hassan.ns.cloudflare.comIn scope2026-11-14
hasslo.ns.cloudflare.comIn scope2026-11-14
hattie.ns.cloudflare.comIn scope2026-11-14
hayes.ns.cloudflare.comIn scope2026-11-14
hazel.ns.cloudflare.comIn scope2026-11-14
heather.ns.cloudflare.comIn scope2026-11-14
heidi.ns.cloudflare.comIn scope2026-11-14
helen.ns.cloudflare.comIn scope2026-11-14
help.ns.cloudflare.comIn scope2026-11-14
henrik.ns.cloudflare.comIn scope2026-11-14
henry.ns.cloudflare.comIn scope2026-11-14
hera.ns.cloudflare.comIn scope2026-11-14
ns4.hera.ns.cloudflare.comIn scope2026-11-14
herald.ns.cloudflare.comIn scope2026-11-14
holly.ns.cloudflare.comIn scope2026-11-14
hope.ns.cloudflare.comIn scope2026-11-14
hostmaster.ns.cloudflare.comIn scope2026-11-14
houston.ns.cloudflare.comIn scope2026-11-14
howard.ns.cloudflare.comIn scope2026-11-14
hugh.ns.cloudflare.comIn scope2026-11-14
ns2.hugh.ns.cloudflare.comIn scope2026-11-14
hunts.ns.cloudflare.comIn scope2026-11-14
huxley.ns.cloudflare.comIn scope2026-11-14
ian.ns.cloudflare.comIn scope2026-11-14
ns2.ian.ns.cloudflare.comIn scope2026-11-14
ica.ns.cloudflare.comIn scope2026-11-14
ignacio.ns.cloudflare.comIn scope2026-11-14
ignat.ns.cloudflare.comIn scope2026-11-14
igor.ns.cloudflare.comIn scope2026-11-14
ima.ns.cloudflare.comIn scope2026-11-14
imani.ns.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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