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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
cp4.cloudflare.comIn scope2026-11-14
cp4-canary.cloudflare.comstagingIn scope2026-11-14
cp4-testing.cloudflare.comtestIn scope2026-11-14
cp5.cloudflare.comIn scope2026-11-14
cp6.cloudflare.comIn scope2026-11-14
cp7.cloudflare.comIn scope2026-11-14
cp8.cloudflare.comIn scope2026-11-14
cp8-staging.cloudflare.comstagingIn scope2026-11-14
cp9.cloudflare.comIn scope2026-11-14
staging.cp9.cloudflare.comstagingIn scope2026-11-14
cpanel-test.cloudflare.comadmin, testIn scope2026-11-14
crl.cloudflare.comIn scope2026-11-14
crypto.cloudflare.comIn scope2026-11-14
cs.cloudflare.comIn scope2026-11-14
csnlink.cloudflare.comIn scope2026-11-14
csp.cloudflare.comIn scope2026-11-14
csp-reporting.cloudflare.comIn scope2026-11-14
ct.cloudflare.comIn scope2026-11-14
nimbus2025-archive.ct.cloudflare.comlegacyIn scope2026-11-14
raio2025h2a.ct.cloudflare.comIn scope2026-11-14
raio2025h2b.ct.cloudflare.comIn scope2026-11-14
raio2026h1a.ct.cloudflare.comIn scope2026-11-14
raio2026h2a.ct.cloudflare.comIn scope2026-11-14
raio2027h1a.ct.cloudflare.comIn scope2026-11-14
raio2027h2a.ct.cloudflare.comIn scope2026-11-14
da.cloudflare.comIn scope2026-11-14
damon.cloudflare.comIn scope2026-11-14
dan.cloudflare.comIn scope2026-11-14
dap.cloudflare.comIn scope2026-11-14
crypto-accel.dap.cloudflare.comIn scope2026-11-14
helper.dap.cloudflare.comIn scope2026-11-14
helper0.dap.cloudflare.comIn scope2026-11-14
helper0-qa.dap.cloudflare.comtestIn scope2026-11-14
helper1.dap.cloudflare.comIn scope2026-11-14
staging.dap.cloudflare.comstagingIn scope2026-11-14
helper0.storage-proxy.dap.cloudflare.comIn scope2026-11-14
helper1.storage-proxy.dap.cloudflare.comIn scope2026-11-14
test.dap.cloudflare.comtestIn scope2026-11-14
crypto-accel.test.dap.cloudflare.comtestIn scope2026-11-14
daric.test.dap.cloudflare.comtestIn scope2026-11-14
daric-issuer.test.dap.cloudflare.comtestIn scope2026-11-14
do-stress.test.dap.cloudflare.comtestIn scope2026-11-14
helper.test.dap.cloudflare.comtestIn scope2026-11-14
helper-foo.test.dap.cloudflare.comtestIn scope2026-11-14
helper-storage.test.dap.cloudflare.comtestIn scope2026-11-14
helper.storage-proxy.test.dap.cloudflare.comtestIn scope2026-11-14
helper-0-3-19.storage-proxy.test.dap.cloudflare.comtestIn scope2026-11-14
helper0.storage-proxy.test.dap.cloudflare.comtestIn scope2026-11-14
helper1.storage-proxy.test.dap.cloudflare.comtestIn scope2026-11-14
dash.cloudflare.comIn scope2026-11-14
one.dash.cloudflare.comIn scope2026-11-14
canary.one.dash.cloudflare.comstagingIn scope2026-11-14
preview.one.dash.cloudflare.comstagingIn scope2026-11-14
sandbox.one.dash.cloudflare.comtestIn scope2026-11-14
ztx-webhooks.one.dash.cloudflare.comIn scope2026-11-14
payments.dash.cloudflare.comIn scope2026-11-14
platform.dash.cloudflare.comIn scope2026-11-14
builder.platform.dash.cloudflare.comIn scope2026-11-14
notifications.platform.dash.cloudflare.comIn scope2026-11-14
onboarding-guide.platform.dash.cloudflare.comIn scope2026-11-14
playground.platform.dash.cloudflare.comIn scope2026-11-14
profile.platform.dash.cloudflare.comIn scope2026-11-14
static.dash.cloudflare.comIn scope2026-11-14
fonts.static.dash.cloudflare.comIn scope2026-11-14
tr.dash.cloudflare.comIn scope2026-11-14
dashboard.cloudflare.comadminIn scope2026-11-14
davos.cloudflare.comIn scope2026-11-14
dcv.cloudflare.comIn scope2026-11-14
dcvcheck.cloudflare.comIn scope2026-11-14
dcvcheck-staging.cloudflare.comstagingIn scope2026-11-14
de.cloudflare.comIn scope2026-11-14
decdnjs.cloudflare.comIn scope2026-11-14
demeter.cloudflare.comIn scope2026-11-14
demos.cloudflare.comIn scope2026-11-14
cobol.demos.cloudflare.comIn scope2026-11-14
fortran.demos.cloudflare.comIn scope2026-11-14
handwritten-digit-classifier.fortran.demos.cloudflare.comIn scope2026-11-14
sieve.demos.cloudflare.comIn scope2026-11-14
developer.cloudflare.comIn scope2026-11-14
middlecache-housekeeping.developer.cloudflare.comIn scope2026-11-14
developers.cloudflare.comIn scope2026-11-14
abracchi.developers.cloudflare.comIn scope2026-11-14
ai.developers.cloudflare.comIn scope2026-11-14
ai-search.developers.cloudflare.comIn scope2026-11-14
alice.developers.cloudflare.comIn scope2026-11-14
api-documentation-site.developers.cloudflare.comapiIn scope2026-11-14
api-documentation-site-v2.developers.cloudflare.comapiIn scope2026-11-14
apidocs-search.developers.cloudflare.comIn scope2026-11-14
bot-api.developers.cloudflare.comapiIn scope2026-11-14
challenge.developers.cloudflare.comIn scope2026-11-14
test.com.developers.cloudflare.comtestIn scope2026-11-14
dpena.developers.cloudflare.comIn scope2026-11-14
feedback.developers.cloudflare.comIn scope2026-11-14
gh-code.developers.cloudflare.comIn scope2026-11-14
internal-previews.developers.cloudflare.cominternalIn scope2026-11-14
keyword-tracker.developers.cloudflare.comIn scope2026-11-14
kody-test.developers.cloudflare.comtestIn scope2026-11-14
marcio.developers.cloudflare.comIn scope2026-11-14
mcp.developers.cloudflare.comIn scope2026-11-14
old.developers.cloudflare.comlegacyIn 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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