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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
osmar.ns.cloudflare.comIn scope2026-11-14
oswald.ns.cloudflare.comIn scope2026-11-14
otto.ns.cloudflare.comIn scope2026-11-14
ou.ns.cloudflare.comIn scope2026-11-14
owen.ns.cloudflare.comIn scope2026-11-14
pablo.ns.cloudflare.comIn scope2026-11-14
paige.ns.cloudflare.comIn scope2026-11-14
paislee.ns.cloudflare.comIn scope2026-11-14
paityn.ns.cloudflare.comIn scope2026-11-14
paloma.ns.cloudflare.comIn scope2026-11-14
pam.ns.cloudflare.comIn scope2026-11-14
paris.ns.cloudflare.comIn scope2026-11-14
pat.ns.cloudflare.comIn scope2026-11-14
patrick.ns.cloudflare.comIn scope2026-11-14
patryk.ns.cloudflare.comIn scope2026-11-14
paul.ns.cloudflare.comIn scope2026-11-14
peaches.ns.cloudflare.comIn scope2026-11-14
pearl.ns.cloudflare.comIn scope2026-11-14
pedro.ns.cloudflare.comIn scope2026-11-14
penny.ns.cloudflare.comIn scope2026-11-14
perin.ns.cloudflare.comIn scope2026-11-14
perla.ns.cloudflare.comIn scope2026-11-14
pete.ns.cloudflare.comIn scope2026-11-14
ns1.pete.ns.cloudflare.comIn scope2026-11-14
peter.ns.cloudflare.comIn scope2026-11-14
peyton.ns.cloudflare.comIn scope2026-11-14
peyton1.ns.cloudflare.comIn scope2026-11-14
phil.ns.cloudflare.comIn scope2026-11-14
phill.ns.cloudflare.comIn scope2026-11-14
phoenix.ns.cloudflare.comIn scope2026-11-14
piers.ns.cloudflare.comIn scope2026-11-14
piotr.ns.cloudflare.comIn scope2026-11-14
piper.ns.cloudflare.comIn scope2026-11-14
plato.ns.cloudflare.comIn scope2026-11-14
pola.ns.cloudflare.comIn scope2026-11-14
pop.ns.cloudflare.comIn scope2026-11-14
poppy.ns.cloudflare.comIn scope2026-11-14
porter.ns.cloudflare.comIn scope2026-11-14
pranab.ns.cloudflare.comIn scope2026-11-14
princess.ns.cloudflare.comIn scope2026-11-14
priscilla.ns.cloudflare.comIn scope2026-11-14
qreq.ns.cloudflare.comIn scope2026-11-14
quentin.ns.cloudflare.comIn scope2026-11-14
quincy.ns.cloudflare.comIn scope2026-11-14
quinton.ns.cloudflare.comIn scope2026-11-14
r.ns.cloudflare.comIn scope2026-11-14
rachel.ns.cloudflare.comIn scope2026-11-14
ns1.rachel.ns.cloudflare.comIn scope2026-11-14
server.rachel.ns.cloudflare.comIn scope2026-11-14
raegan.ns.cloudflare.comIn scope2026-11-14
rafe.ns.cloudflare.comIn scope2026-11-14
raina.ns.cloudflare.comIn scope2026-11-14
rajeev.ns.cloudflare.comIn scope2026-11-14
ram.ns.cloudflare.comIn scope2026-11-14
randall.ns.cloudflare.comIn scope2026-11-14
randy.ns.cloudflare.comIn scope2026-11-14
rank.ns.cloudflare.comIn scope2026-11-14
raphaela.ns.cloudflare.comIn scope2026-11-14
raquel.ns.cloudflare.comIn scope2026-11-14
ray.ns.cloudflare.comIn scope2026-11-14
ns2.ray.ns.cloudflare.comIn scope2026-11-14
rayden.ns.cloudflare.comIn scope2026-11-14
rayne.ns.cloudflare.comIn scope2026-11-14
razvan.ns.cloudflare.comIn scope2026-11-14
reese.ns.cloudflare.comIn scope2026-11-14
remy.ns.cloudflare.comIn scope2026-11-14
renan.ns.cloudflare.comIn scope2026-11-14
rene.ns.cloudflare.comIn scope2026-11-14
rex.ns.cloudflare.comIn scope2026-11-14
reza.ns.cloudflare.comIn scope2026-11-14
ns2.reza.ns.cloudflare.comIn scope2026-11-14
rhiana.ns.cloudflare.comIn scope2026-11-14
ri.ns.cloudflare.comIn scope2026-11-14
ria.ns.cloudflare.comIn scope2026-11-14
ricardo.ns.cloudflare.comIn scope2026-11-14
rick.ns.cloudflare.comIn scope2026-11-14
hostmaster.rick.ns.cloudflare.comIn scope2026-11-14
ridge.ns.cloudflare.comIn scope2026-11-14
rihana.ns.cloudflare.comIn scope2026-11-14
ris.ns.cloudflare.comIn scope2026-11-14
rita.ns.cloudflare.comIn scope2026-11-14
rite.ns.cloudflare.comIn scope2026-11-14
riya.ns.cloudflare.comIn scope2026-11-14
roan.ns.cloudflare.comIn scope2026-11-14
rob.ns.cloudflare.comIn scope2026-11-14
robert.ns.cloudflare.comIn scope2026-11-14
robin.ns.cloudflare.comIn scope2026-11-14
rocco.ns.cloudflare.comIn scope2026-11-14
rochan.ns.cloudflare.comIn scope2026-11-14
rocky.ns.cloudflare.comIn scope2026-11-14
rodney.ns.cloudflare.comIn scope2026-11-14
rodrigo.ns.cloudflare.comIn scope2026-11-14
rohin.ns.cloudflare.comIn scope2026-11-14
roman.ns.cloudflare.comIn scope2026-11-14
romina.ns.cloudflare.comIn scope2026-11-14
rommy.ns.cloudflare.comIn scope2026-11-14
rory.ns.cloudflare.comIn scope2026-11-14
rosa.ns.cloudflare.comIn scope2026-11-14
rosalie.ns.cloudflare.comIn scope2026-11-14
rosalyn.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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