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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.radar.cloudflare.comapiIn scope2026-11-14
assets.radar.cloudflare.comIn scope2026-11-14
assets-staging.radar.cloudflare.comstagingIn scope2026-11-14
backoffice.radar.cloudflare.comadminIn scope2026-11-14
classic.radar.cloudflare.comlegacyIn scope2026-11-14
datasets.radar.cloudflare.comIn scope2026-11-14
ip-check-perf.radar.cloudflare.comtestIn scope2026-11-14
ipv4-check-perf.radar.cloudflare.comtestIn scope2026-11-14
ipv6-check-perf.radar.cloudflare.comtestIn scope2026-11-14
performance.radar.cloudflare.comIn scope2026-11-14
tools.radar.cloudflare.comIn scope2026-11-14
v2.radar.cloudflare.comIn scope2026-11-14
web-bot-auth-directory.radar.cloudflare.comauthIn scope2026-11-14
worker-openapi-example.radar.cloudflare.comapiIn scope2026-11-14
rdap.cloudflare.comIn scope2026-11-14
realtime.cloudflare.comIn scope2026-11-14
accounts.realtime.cloudflare.comIn scope2026-11-14
accounts-devel.realtime.cloudflare.comdevIn scope2026-11-14
accounts2.realtime.cloudflare.comIn scope2026-11-14
agents.realtime.cloudflare.comIn scope2026-11-14
ai.realtime.cloudflare.comIn scope2026-11-14
angular-examples.realtime.cloudflare.comIn scope2026-11-14
angular-samples.realtime.cloudflare.comIn scope2026-11-14
api.realtime.cloudflare.comapiIn scope2026-11-14
api-devel.realtime.cloudflare.comapi, devIn scope2026-11-14
api-devel-2.realtime.cloudflare.comapi, devIn scope2026-11-14
api-gw-devel.realtime.cloudflare.comapi, devIn scope2026-11-14
api-silos.realtime.cloudflare.comapiIn scope2026-11-14
api-silos-devel.realtime.cloudflare.comapi, devIn scope2026-11-14
api0.realtime.cloudflare.comapiIn scope2026-11-14
da-collector.realtime.cloudflare.comIn scope2026-11-14
dash.realtime.cloudflare.comIn scope2026-11-14
db-migrator.realtime.cloudflare.comdataIn scope2026-11-14
demo.realtime.cloudflare.comtestListed out of scope2026-11-14
demo-app-dyte-realtime-migration.realtime.cloudflare.comtestIn scope2026-11-14
demo-devel.realtime.cloudflare.comdev, testIn scope2026-11-14
demo-preprod.realtime.cloudflare.comstaging, testIn scope2026-11-14
devel.demo.realtime.cloudflare.comdev, testIn scope2026-11-14
dev.realtime.cloudflare.comdevIn scope2026-11-14
dev-devel.realtime.cloudflare.comdevIn scope2026-11-14
devel-demo.realtime.cloudflare.comdev, testIn scope2026-11-14
api0.devel.realtime.cloudflare.comapi, devIn scope2026-11-14
demo.devel.realtime.cloudflare.comdev, testIn scope2026-11-14
device-emulator.realtime.cloudflare.comIn scope2026-11-14
docs.realtime.cloudflare.comIn scope2026-11-14
examples.realtime.cloudflare.comListed out of scope2026-11-14
firebolt.realtime.cloudflare.comIn scope2026-11-14
html-examples.realtime.cloudflare.comIn scope2026-11-14
html-samples.realtime.cloudflare.comIn scope2026-11-14
icons.realtime.cloudflare.comIn scope2026-11-14
location.realtime.cloudflare.comIn scope2026-11-14
location-devel.realtime.cloudflare.comdevIn scope2026-11-14
media-hub.realtime.cloudflare.comIn scope2026-11-14
media-hub-devel.realtime.cloudflare.comdevIn scope2026-11-14
media-hub-preprod.realtime.cloudflare.comstagingIn scope2026-11-14
media-hub-production.realtime.cloudflare.comIn scope2026-11-14
metrics-gateway.realtime.cloudflare.commonitoringIn scope2026-11-14
migration-dashboard.realtime.cloudflare.comadminIn scope2026-11-14
docshare.plugins.realtime.cloudflare.comListed out of scope2026-11-14
files.plugins.realtime.cloudflare.comdataListed out of scope2026-11-14
rustpad.plugins.realtime.cloudflare.comListed out of scope2026-11-14
rustpad-backend.plugins.realtime.cloudflare.comListed out of scope2026-11-14
streamer.plugins.realtime.cloudflare.comListed out of scope2026-11-14
whiteboard.plugins.realtime.cloudflare.comListed out of scope2026-11-14
whiteboard-v2.plugins.realtime.cloudflare.comListed out of scope2026-11-14
agents.production.realtime.cloudflare.comIn scope2026-11-14
react-examples.realtime.cloudflare.comListed out of scope2026-11-14
react-samples.realtime.cloudflare.comIn scope2026-11-14
recording-worker-prod.realtime.cloudflare.comIn scope2026-11-14
recording-worker-staging.realtime.cloudflare.comstagingIn scope2026-11-14
rtk.realtime.cloudflare.comIn scope2026-11-14
rtk-assets.realtime.cloudflare.comIn scope2026-11-14
rtk-devel.realtime.cloudflare.comdevIn scope2026-11-14
rtk-preset.realtime.cloudflare.comIn scope2026-11-14
rtk-staging.realtime.cloudflare.comstagingIn scope2026-11-14
rtk-uploads.realtime.cloudflare.comdataIn scope2026-11-14
rtk-webhook-receiver.realtime.cloudflare.comIn scope2026-11-14
sdk-assets.realtime.cloudflare.comIn scope2026-11-14
socket.realtime.cloudflare.comIn scope2026-11-14
socket-devel.realtime.cloudflare.comdevIn scope2026-11-14
socket-edge.realtime.cloudflare.comIn scope2026-11-14
socket-edge-devel.realtime.cloudflare.comdevIn scope2026-11-14
socket-hub-workers.realtime.cloudflare.comIn scope2026-11-14
socket-preprod.realtime.cloudflare.comstagingIn scope2026-11-14
staging.realtime.cloudflare.comstagingIn scope2026-11-14
accounts.staging.realtime.cloudflare.comstagingIn scope2026-11-14
accounts-test.staging.realtime.cloudflare.comstaging, testIn scope2026-11-14
agents.staging.realtime.cloudflare.comstagingIn scope2026-11-14
ai.staging.realtime.cloudflare.comstagingIn scope2026-11-14
angular-examples.staging.realtime.cloudflare.comstagingIn scope2026-11-14
api.staging.realtime.cloudflare.comapi, stagingListed out of scope2026-11-14
api-silos.staging.realtime.cloudflare.comapi, stagingIn scope2026-11-14
api0.staging.realtime.cloudflare.comapi, stagingIn scope2026-11-14
da-collector.staging.realtime.cloudflare.comstagingIn scope2026-11-14
dash.staging.realtime.cloudflare.comstagingIn scope2026-11-14
db-migrator.staging.realtime.cloudflare.comdata, stagingIn scope2026-11-14
demo.staging.realtime.cloudflare.comstaging, testIn scope2026-11-14
dev.staging.realtime.cloudflare.comdev, stagingIn scope2026-11-14
examples.staging.realtime.cloudflare.comstagingIn scope2026-11-14
html-examples.staging.realtime.cloudflare.comstagingIn 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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