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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
api.notifications.fed.cloudflare.comapiIn scope2026-11-14
api-staging.notifications.fed.cloudflare.comapi, stagingIn scope2026-11-14
observability.fed.cloudflare.comIn scope2026-11-14
live-tail.observability.fed.cloudflare.comIn scope2026-11-14
portal.observability.fed.cloudflare.comIn scope2026-11-14
real-time-issues.observability.fed.cloudflare.comIn scope2026-11-14
wrangler-tail.observability.fed.cloudflare.comIn scope2026-11-14
one.fed.cloudflare.comIn scope2026-11-14
help.one.fed.cloudflare.comIn scope2026-11-14
phishnet.fed.cloudflare.comIn scope2026-11-14
test.phishnet.fed.cloudflare.comtestIn scope2026-11-14
registry.fed.cloudflare.comtoolsIn scope2026-11-14
staging.registry.fed.cloudflare.comstaging, toolsIn scope2026-11-14
api.staging.fed.cloudflare.comapi, stagingIn scope2026-11-14
edge-iapi-certs-staging.api.staging.fed.cloudflare.comapi, stagingIn scope2026-11-14
dash.staging.fed.cloudflare.comstagingIn scope2026-11-14
one.dash.staging.fed.cloudflare.comstagingIn scope2026-11-14
platform.dash.staging.fed.cloudflare.comstagingIn scope2026-11-14
blocked.teams.fed.cloudflare.comIn scope2026-11-14
ssf.risk-score.teams.fed.cloudflare.comIn scope2026-11-14
staging.ssf.risk-score.teams.fed.cloudflare.comstagingIn scope2026-11-14
stagingblocked.teams.fed.cloudflare.comIn scope2026-11-14
api.workers.fed.cloudflare.comapiIn scope2026-11-14
feedback.cloudflare.comIn scope2026-11-14
fi.cloudflare.comIn scope2026-11-14
file.cloudflare.comIn scope2026-11-14
firewall.cloudflare.comIn scope2026-11-14
flags.cloudflare.comIn scope2026-11-14
flagship.cloudflare.comIn scope2026-11-14
flas.cloudflare.comIn scope2026-11-14
fls.cloudflare.comIn scope2026-11-14
fonts.cloudflare.comIn scope2026-11-14
fr.cloudflare.comIn scope2026-11-14
fra01.cloudflare.comIn scope2026-11-14
edge01.fra01.cloudflare.comIn scope2026-11-14
fred.cloudflare.comIn scope2026-11-14
gabe.cloudflare.comIn scope2026-11-14
gates.cloudflare.comIn scope2026-11-14
react.gates.cloudflare.comIn scope2026-11-14
staging.gates.cloudflare.comstagingIn scope2026-11-14
gateway-control.cloudflare.comIn scope2026-11-14
www.gateway-control.cloudflare.comIn scope2026-11-14
gateway-privacy.cloudflare.comIn scope2026-11-14
gcore.cloudflare.comIn scope2026-11-14
gcore2.cloudflare.comIn scope2026-11-14
geofeeds.cloudflare.comIn scope2026-11-14
geoglyph.cloudflare.comIn scope2026-11-14
getcommitdatanjs.cloudflare.comIn scope2026-11-14
www.gina.cloudflare.comIn scope2026-11-14
gitrepo.cloudflare.comIn scope2026-11-14
html5shiv.googlecodecdnjs.cloudflare.comIn scope2026-11-14
gpu.cloudflare.comIn scope2026-11-14
graphql.cloudflare.comapiIn scope2026-11-14
hans.cloudflare.comIn scope2026-11-14
he.cloudflare.comIn scope2026-11-14
heather.cloudflare.comIn scope2026-11-14
helios.cloudflare.comIn scope2026-11-14
hermes.cloudflare.comIn scope2026-11-14
hi.cloudflare.comIn scope2026-11-14
hope.cloudflare.comIn scope2026-11-14
host.cloudflare.comIn scope2026-11-14
host-95-130-170-179.cloudflare.comIn scope2026-11-14
host-95-130-170-180.cloudflare.comIn scope2026-11-14
host-95-130-170-181.cloudflare.comIn scope2026-11-14
host-95-130-170-182.cloudflare.comIn scope2026-11-14
host-95-130-173-189.cloudflare.comIn scope2026-11-14
hostmaster.cloudflare.comIn scope2026-11-14
hot-bytes-1.cloudflare.comIn scope2026-11-14
href.cloudflare.comIn scope2026-11-14
a.href.cloudflare.comIn scope2026-11-14
demo.href.cloudflare.comtestIn scope2026-11-14
http2.cloudflare.comIn scope2026-11-14
http2demo.cloudflare.comtestIn scope2026-11-14
hu.cloudflare.comIn scope2026-11-14
hyperion.cloudflare.comIn scope2026-11-14
ian.cloudflare.comIn scope2026-11-14
iapi.cloudflare.comIn scope2026-11-14
id.cloudflare.comIn scope2026-11-14
idrac.cloudflare.comIn scope2026-11-14
images.cloudflare.comIn scope2026-11-14
js.images.cloudflare.comIn scope2026-11-14
inens.cloudflare.comIn scope2026-11-14
cf-protected-usr.korobase.inf06.cloudflare.comIn scope2026-11-14
info.cloudflare.comIn scope2026-11-14
leechen.infowww.cloudflare.comIn scope2026-11-14
ingest.cloudflare.comIn scope2026-11-14
ingest-staging.cloudflare.comstagingIn scope2026-11-14
integrations.cloudflare.comIn scope2026-11-14
api.integrations.cloudflare.comapiIn scope2026-11-14
api.staging.integrations.cloudflare.comapi, stagingIn scope2026-11-14
cf1.staging.integrations.cloudflare.comstagingIn scope2026-11-14
static.integrations.cloudflare.comIn scope2026-11-14
intel.cloudflare.comIn scope2026-11-14
assets.intel.cloudflare.comIn scope2026-11-14
investors.cloudflare.comIn scope2026-11-14
ip.cloudflare.comIn scope2026-11-14
79-59-245-173.ip.cloudflare.comIn scope2026-11-14
ipfs.cloudflare.comIn scope2026-11-14
gateway.ipfs.cloudflare.comIn scope2026-11-14
indexer.ipfs.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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