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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
zita.ns.cloudflare.comIn scope2026-11-14
zod.ns.cloudflare.comIn scope2026-11-14
zoe.ns.cloudflare.comIn scope2026-11-14
ns1.cloudflare.comIn scope2026-11-14
ns2.cloudflare.comIn scope2026-11-14
ns3.cloudflare.comIn scope2026-11-14
ns4.cloudflare.comIn scope2026-11-14
ns5.cloudflare.comIn scope2026-11-14
ns6.cloudflare.comIn scope2026-11-14
ns7.cloudflare.comIn scope2026-11-14
nile.nssssssss.cloudflare.comIn scope2026-11-14
nxnx.cloudflare.comIn scope2026-11-14
oai-gateway.cloudflare.comIn scope2026-11-14
staging.oai-gateway.cloudflare.comstagingIn scope2026-11-14
oblivious-http.cloudflare.comIn scope2026-11-14
berkeley-eecs.oblivious-http.cloudflare.comIn scope2026-11-14
gateway.oblivious-http.cloudflare.comIn scope2026-11-14
observability.cloudflare.comIn scope2026-11-14
observability-staging.cloudflare.comstagingIn scope2026-11-14
live-tail.observability-staging.cloudflare.comstagingIn scope2026-11-14
live-tail.observability.cloudflare.comIn scope2026-11-14
ocsp.cloudflare.comIn scope2026-11-14
ohttp-gateway.cloudflare.comIn scope2026-11-14
ohttp-issuer.cloudflare.comIn scope2026-11-14
ohttp-issuer-staging.cloudflare.comstagingIn scope2026-11-14
ohttp-relay.cloudflare.comIn scope2026-11-14
oidc.cloudflare.comauthIn scope2026-11-14
oidc-staging.cloudflare.comauth, stagingIn scope2026-11-14
one.cloudflare.comIn scope2026-11-14
help.one.cloudflare.comIn scope2026-11-14
cf-kittitascounty.org7-128-242.cloudflare.comIn scope2026-11-14
origin-pull.cloudflare.comIn scope2026-11-14
cf-ezlh.p245-48-127.cloudflare.comIn scope2026-11-14
pacos.cloudflare.comIn scope2026-11-14
pagejs.cloudflare.comIn scope2026-11-14
pages.cloudflare.comIn scope2026-11-14
staging.pages.cloudflare.comstagingIn scope2026-11-14
papcdnjs.cloudflare.comIn scope2026-11-14
partnerdemandcenter.cloudflare.comIn scope2026-11-14
partnerlocator.cloudflare.comIn scope2026-11-14
partnernews.cloudflare.comIn scope2026-11-14
wildcard.partnernews.cloudflare.comIn scope2026-11-14
partnerportal.cloudflare.comIn scope2026-11-14
partners.cloudflare.comIn scope2026-11-14
pricing-estimator.partners.cloudflare.comIn scope2026-11-14
www.staging.partners.cloudflare.comstagingIn scope2026-11-14
www.partners.cloudflare.comIn scope2026-11-14
partnertest.cloudflare.comIn scope2026-11-14
pat-issuer.cloudflare.comIn scope2026-11-14
croissant.pat-issuer.cloudflare.comIn scope2026-11-14
dap.pat-issuer.cloudflare.comIn scope2026-11-14
demo.pat-issuer.cloudflare.comtestIn scope2026-11-14
demo-dev.pat-issuer.cloudflare.comdev, testIn scope2026-11-14
demo-origin.pat-issuer.cloudflare.comtestIn scope2026-11-14
dev.pat-issuer.cloudflare.comdevIn scope2026-11-14
rate-limit-86400-demo-origin.pat-issuer.cloudflare.comtestIn scope2026-11-14
rate-limiting-3600.pat-issuer.cloudflare.comIn scope2026-11-14
rate-limiting-86400.pat-issuer.cloudflare.comIn scope2026-11-14
sat.pat-issuer.cloudflare.comIn scope2026-11-14
sat-dev.pat-issuer.cloudflare.comdevIn scope2026-11-14
ns.paul.cloudflare.comIn scope2026-11-14
payments.cloudflare.comIn scope2026-11-14
peering.cloudflare.comIn scope2026-11-14
peering-ix.cloudflare.comIn scope2026-11-14
phishfilet.cloudflare.comIn scope2026-11-14
phishnet.cloudflare.comIn scope2026-11-14
test.phishnet.cloudflare.comtestIn scope2026-11-14
pipelines.cloudflare.comIn scope2026-11-14
pipelines-staging.cloudflare.comstagingIn scope2026-11-14
admin.pipelines-staging.cloudflare.comadmin, stagingIn scope2026-11-14
o2o-ingress.pipelines-staging.cloudflare.comstagingIn scope2026-11-14
o2o-ingress-v2.pipelines-staging.cloudflare.comstagingIn scope2026-11-14
oauth.pipelines-staging.cloudflare.comauth, stagingIn scope2026-11-14
wildcard.pipelines-staging.cloudflare.comstagingIn scope2026-11-14
wildcard.pipelines.cloudflare.comIn scope2026-11-14
piter-ix.cloudflare.comIn scope2026-11-14
pkg.cloudflare.comIn scope2026-11-14
next.pkg.cloudflare.comIn scope2026-11-14
pl.cloudflare.comIn scope2026-11-14
de-cix.pmo.cloudflare.comIn scope2026-11-14
polygon.cloudflare.comIn scope2026-11-14
test.polygon.cloudflare.comtestIn scope2026-11-14
privacy-auditability.cloudflare.comIn scope2026-11-14
api.privacy-auditability.cloudflare.comapiIn scope2026-11-14
staging-api.privacy-auditability.cloudflare.comapi, stagingIn scope2026-11-14
privacy-gateway.cloudflare.comIn scope2026-11-14
aa.privacy-gateway.cloudflare.comIn scope2026-11-14
meta.hpke-keys.privacy-gateway.cloudflare.comIn scope2026-11-14
meta.privacy-gateway.cloudflare.comIn scope2026-11-14
meta-relay.privacy-gateway.cloudflare.comIn scope2026-11-14
oblivious-gateway.privacy-gateway.cloudflare.comIn scope2026-11-14
staging.oblivious-gateway.privacy-gateway.cloudflare.comstagingIn scope2026-11-14
relay-app.privacy-gateway.cloudflare.comIn scope2026-11-14
privacy-relay.cloudflare.comIn scope2026-11-14
privacypass.cloudflare.comIn scope2026-11-14
issuance.privacypass.cloudflare.comIn scope2026-11-14
pt.cloudflare.comIn scope2026-11-14
pt-br.cloudflare.comIn scope2026-11-14
r2-calculator.cloudflare.comIn scope2026-11-14
radar.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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