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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
location.staging.realtime.cloudflare.comstagingIn scope2026-11-14
location-legacy.staging.realtime.cloudflare.comlegacy, stagingIn scope2026-11-14
media-hub.staging.realtime.cloudflare.comstagingIn scope2026-11-14
milap-poc-flarevault.staging.realtime.cloudflare.comstagingIn scope2026-11-14
milap-secrets-poc.staging.realtime.cloudflare.comstagingIn scope2026-11-14
react-examples.staging.realtime.cloudflare.comstagingIn scope2026-11-14
rtk.staging.realtime.cloudflare.comstagingIn scope2026-11-14
sessions-cf.staging.realtime.cloudflare.comstagingIn scope2026-11-14
socket-edge.staging.realtime.cloudflare.comstagingIn scope2026-11-14
socket-edge-v2.staging.realtime.cloudflare.comstagingIn scope2026-11-14
socket-hub-workers.staging.realtime.cloudflare.comstagingIn scope2026-11-14
webhook-dispatch.staging.realtime.cloudflare.comstagingIn scope2026-11-14
test.realtime.cloudflare.comtestListed out of scope2026-11-14
test-devel.realtime.cloudflare.comdev, testIn scope2026-11-14
webhook-dispatch.realtime.cloudflare.comIn scope2026-11-14
webhook-dispatch-devel.realtime.cloudflare.comdevIn scope2026-11-14
webhook-dispatch-prod.realtime.cloudflare.comIn scope2026-11-14
region.cloudflare.comIn scope2026-11-14
api.region.cloudflare.comNewapiIn scope2026-11-15
ingress.region.cloudflare.comNewIn scope2026-11-15
staging.region.cloudflare.comstagingIn scope2026-11-14
api.staging.region.cloudflare.comapi, stagingIn scope2026-11-14
05e2f63bd7f2ed7db1a88bbd0f8577a8.api.staging.region.cloudflare.comapi, stagingIn scope2026-11-14
6034e8d8d7d54d53a5e8fb5d93f21285.api.staging.region.cloudflare.comapi, stagingIn scope2026-11-14
6b1dcfa6e46b2a440f2a0660ae1a7b76.api.staging.region.cloudflare.comapi, stagingIn scope2026-11-14
8826eeeb4843efca82a4b4cb08a5d263.api.staging.region.cloudflare.comapi, stagingIn scope2026-11-14
9bff19a6e828d2a2ef5a8c94b3b12fc6.api.staging.region.cloudflare.comapi, stagingIn scope2026-11-14
cp-probe-fb1.api.staging.region.cloudflare.comapi, stagingIn scope2026-11-14
cp-probe-http.api.staging.region.cloudflare.comapi, stagingIn scope2026-11-14
cp-probe-nudge.api.staging.region.cloudflare.comapi, stagingIn scope2026-11-14
cp-probe-txt.api.staging.region.cloudflare.comapi, stagingIn scope2026-11-14
cp-probe-txt-le.api.staging.region.cloudflare.comapi, stagingIn scope2026-11-14
cp-probe-wc2.api.staging.region.cloudflare.comapi, stagingIn scope2026-11-14
cp-probe-wc3.api.staging.region.cloudflare.comapi, stagingIn scope2026-11-14
ingress.staging.region.cloudflare.comstagingIn scope2026-11-14
registrar.cloudflare.comIn scope2026-11-14
admin.registrar.cloudflare.comadminIn scope2026-11-14
admin-staging.registrar.cloudflare.comadmin, stagingIn scope2026-11-14
cor.registrar.cloudflare.comIn scope2026-11-14
cor-staging.registrar.cloudflare.comstagingIn scope2026-11-14
default-page.registrar.cloudflare.comIn scope2026-11-14
domaincontact.registrar.cloudflare.comIn scope2026-11-14
domaincontact-staging.registrar.cloudflare.comstagingIn scope2026-11-14
foa.registrar.cloudflare.comIn scope2026-11-14
foa-staging.registrar.cloudflare.comstagingIn scope2026-11-14
landing.registrar.cloudflare.comIn scope2026-11-14
landing-staging.registrar.cloudflare.comstagingIn scope2026-11-14
parking.registrar.cloudflare.comIn scope2026-11-14
parking-staging.registrar.cloudflare.comstagingIn scope2026-11-14
pricing.registrar.cloudflare.comIn scope2026-11-14
pricing-staging.registrar.cloudflare.comstagingIn scope2026-11-14
api.pricing.registrar.cloudflare.comapiIn scope2026-11-14
api-staging.pricing.registrar.cloudflare.comapi, stagingIn scope2026-11-14
rdap.registrar.cloudflare.comIn scope2026-11-14
rdap-staging.registrar.cloudflare.comstagingIn scope2026-11-14
search.registrar.cloudflare.comIn scope2026-11-14
search-staging.registrar.cloudflare.comstagingIn scope2026-11-14
search-staging-sanity.registrar.cloudflare.comstagingIn scope2026-11-14
ws.search.registrar.cloudflare.comIn scope2026-11-14
ws-staging.search.registrar.cloudflare.comstagingIn scope2026-11-14
ws-staging-sanity.search.registrar.cloudflare.comstagingIn scope2026-11-14
trampoline.registrar.cloudflare.comIn scope2026-11-14
trampoline-staging.registrar.cloudflare.comstagingIn scope2026-11-14
registry.cloudflare.comtoolsIn scope2026-11-14
staging.registry.cloudflare.comstaging, toolsIn scope2026-11-14
report-uri.cloudflare.comIn scope2026-11-14
research.cloudflare.comIn scope2026-11-14
access-trail.research.cloudflare.comvpnIn scope2026-11-14
act-issuer.research.cloudflare.comIn scope2026-11-14
act-origin.research.cloudflare.comIn scope2026-11-14
cefan-scratchpad.research.cloudflare.comIn scope2026-11-14
challenger.research.cloudflare.comIn scope2026-11-14
conferences.research.cloudflare.comIn scope2026-11-14
cv2-log-provider.research.cloudflare.comIn scope2026-11-14
cv2-logprovider.research.cloudflare.comIn scope2026-11-14
cv2-witness.research.cloudflare.comIn scope2026-11-14
dap-demo.research.cloudflare.comtestIn scope2026-11-14
datasets.research.cloudflare.comIn scope2026-11-14
demo-pat.research.cloudflare.comtestIn scope2026-11-14
demo-pp-attester.research.cloudflare.comtestIn scope2026-11-14
discord-attester.research.cloudflare.comIn scope2026-11-14
discord-bot.research.cloudflare.comIn scope2026-11-14
discord-mock-oauth.research.cloudflare.comauthIn scope2026-11-14
files.research.cloudflare.comdataIn scope2026-11-14
ge-trans-for-meer.research.cloudflare.comIn scope2026-11-14
goldilocks-ent.research.cloudflare.comIn scope2026-11-14
goldilocks-free.research.cloudflare.comIn scope2026-11-14
goldilocks-pro.research.cloudflare.comIn scope2026-11-14
http-message-signatures-example.research.cloudflare.comIn scope2026-11-14
js-challenger.research.cloudflare.comIn scope2026-11-14
managed-challenger.research.cloudflare.comIn scope2026-11-14
mole.research.cloudflare.comIn scope2026-11-14
mole-anchor-nocheck.research.cloudflare.comIn scope2026-11-14
mole-anchor-sso.research.cloudflare.comauthIn scope2026-11-14
mole-anchor-turnstile.research.cloudflare.comIn scope2026-11-14
mole-moderator.research.cloudflare.comIn scope2026-11-14
no-challenger.research.cloudflare.comIn scope2026-11-14
objects.research.cloudflare.comIn scope2026-11-14
ohttp-debug.research.cloudflare.comIn scope2026-11-14
relay.ohttp.research.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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