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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
previews.developers.cloudflare.comIn scope2026-11-14
psousa.developers.cloudflare.comIn scope2026-11-14
ranbel.developers.cloudflare.comIn scope2026-11-14
smartling.developers.cloudflare.comIn scope2026-11-14
staging.developers.cloudflare.comstagingIn scope2026-11-14
test.developers.cloudflare.comtestIn scope2026-11-14
www.developers.cloudflare.comIn scope2026-11-14
devices.cloudflare.comIn scope2026-11-14
bext.devices.cloudflare.comIn scope2026-11-14
staging.devices.cloudflare.comstagingIn scope2026-11-14
dex.cloudflare.comIn scope2026-11-14
admin.dex.cloudflare.comadminIn scope2026-11-14
edge-api.dex.cloudflare.comapiIn scope2026-11-14
staging.dex.cloudflare.comstagingIn scope2026-11-14
admin.staging.dex.cloudflare.comadmin, stagingIn scope2026-11-14
edge-api.staging.dex.cloudflare.comapi, stagingIn scope2026-11-14
timescale.dex.cloudflare.comIn scope2026-11-14
de-cix.dfw.cloudflare.comIn scope2026-11-14
diablo.cloudflare.comIn scope2026-11-14
cf-protected-cdn.diari-173-245-49-223.cloudflare.comIn scope2026-11-14
dict-compression.cloudflare.comIn scope2026-11-14
discord.cloudflare.comIn scope2026-11-14
admin.discord.cloudflare.comadminIn scope2026-11-14
escalations.discord.cloudflare.comIn scope2026-11-14
support-ai-feedback.discord.cloudflare.comIn scope2026-11-14
dnjs.cloudflare.comIn scope2026-11-14
dns.cloudflare.comIn scope2026-11-14
dns1.cloudflare.comIn scope2026-11-14
dns2.cloudflare.comIn scope2026-11-14
dns3.cloudflare.comIn scope2026-11-14
do.cloudflare.comIn scope2026-11-14
docker.cloudflare.comtoolsIn scope2026-11-14
docs.cloudflare.comIn scope2026-11-14
challenge.docs.cloudflare.comIn scope2026-11-14
feedback.docs.cloudflare.comIn scope2026-11-14
keyword-tracker.docs.cloudflare.comIn scope2026-11-14
domains.cloudflare.comIn scope2026-11-14
donscots.cloudflare.comIn scope2026-11-14
drand.cloudflare.comIn scope2026-11-14
mainnet1-api.drand.cloudflare.comapiIn scope2026-11-14
mainnet2-api.drand.cloudflare.comapiIn scope2026-11-14
testnet-api.drand.cloudflare.comapiIn scope2026-11-14
drop.cloudflare.comIn scope2026-11-14
lynn.ds.cloudflare.comIn scope2026-11-14
dtel-ix.cloudflare.comIn scope2026-11-14
dty2dun4zns.cloudflare.comIn scope2026-11-14
server.ed.cloudflare.comIn scope2026-11-14
editor.cloudflare.comIn scope2026-11-14
editor-staging.cloudflare.comstagingIn scope2026-11-14
scm.editor-staging.cloudflare.comgit, stagingIn scope2026-11-14
scm.editor.cloudflare.comgitIn scope2026-11-14
edna.cloudflare.comIn scope2026-11-14
el.cloudflare.comIn scope2026-11-14
cdn.em2.cloudflare.comIn scope2026-11-14
data.em2.cloudflare.comIn scope2026-11-14
r230.em2.cloudflare.comIn scope2026-11-14
r231.em2.cloudflare.comIn scope2026-11-14
r232.em2.cloudflare.comIn scope2026-11-14
r233.em2.cloudflare.comIn scope2026-11-14
email.cloudflare.comIn scope2026-11-14
emma.cloudflare.comIn scope2026-11-14
antale.front-4.enterprise.cloudflare.comIn scope2026-11-14
eqix-ema-ch.cloudflare.comIn scope2026-11-14
eqix-ema-da.cloudflare.comIn scope2026-11-14
eqix-ema-dc.cloudflare.comIn scope2026-11-14
eqix-ema-la.cloudflare.comIn scope2026-11-14
eqix-ema-sv.cloudflare.comIn scope2026-11-14
eqix-ix-sv8.cloudflare.comIn scope2026-11-14
eqix-sv5.cloudflare.comIn scope2026-11-14
equinix-helsinki.cloudflare.comIn scope2026-11-14
equinix-paris.cloudflare.comIn scope2026-11-14
es.cloudflare.comIn scope2026-11-14
ethereum.cloudflare.comIn scope2026-11-14
ingress.ethereum.cloudflare.comIn scope2026-11-14
staging.ethereum.cloudflare.comstagingIn scope2026-11-14
gw.staging.ethereum.cloudflare.comstagingIn scope2026-11-14
lb-test.staging.ethereum.cloudflare.comstaging, testIn scope2026-11-14
test.ethereum.cloudflare.comtestIn scope2026-11-14
test-ipfs.ethereum.cloudflare.comtestIn scope2026-11-14
evenstar.cloudflare.comIn scope2026-11-14
events.cloudflare.comIn scope2026-11-14
cf-protected-www.alt-tag.com.cdn.f-190-93-247-62.cloudflare.comIn scope2026-11-14
fcdnjs.cloudflare.comIn scope2026-11-14
fed.cloudflare.comIn scope2026-11-14
gateway.ai.fed.cloudflare.comIn scope2026-11-14
config.gateway.ai.fed.cloudflare.comIn scope2026-11-14
models.gateway.ai.fed.cloudflare.comIn scope2026-11-14
api.fed.cloudflare.comapiIn scope2026-11-14
edge-iapi-certs-prod.api.fed.cloudflare.comapiIn scope2026-11-14
challenges.fed.cloudflare.comIn scope2026-11-14
dash.fed.cloudflare.comIn scope2026-11-14
one.dash.fed.cloudflare.comIn scope2026-11-14
platform.dash.fed.cloudflare.comIn scope2026-11-14
devices.fed.cloudflare.comIn scope2026-11-14
bext.devices.fed.cloudflare.comIn scope2026-11-14
staging.devices.fed.cloudflare.comstagingIn scope2026-11-14
logs.fed.cloudflare.commonitoringIn scope2026-11-14
instant-logs.logs.fed.cloudflare.commonitoringIn scope2026-11-14
instant-logs-access.logs.fed.cloudflare.commonitoring, vpnIn scope2026-11-14
notifications.fed.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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