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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:cloudflareaccess.com
Scope
Name suggests
First seen
Text fileClear filters4,882 names
Subdomains of Cloudflare Public Bug Bounty
NameScopeFirst seen
farfetch.cloudflareaccess.comNot in the scope2026-11-14
farmaciasroma.cloudflareaccess.comNot in the scope2026-11-14
farzahn.cloudflareaccess.comNot in the scope2026-11-14
fashionunited.cloudflareaccess.comNot in the scope2026-11-14
fastcccam.cloudflareaccess.comNot in the scope2026-11-14
faycloudfao91jsss9j08ga.cloudflareaccess.comNot in the scope2026-11-14
fazzio.cloudflareaccess.comNot in the scope2026-11-14
fb.cloudflareaccess.comNot in the scope2026-11-14
fbfiber.cloudflareaccess.comNot in the scope2026-11-14
fbmb.cloudflareaccess.comNot in the scope2026-11-14
featurepeek.cloudflareaccess.comNot in the scope2026-11-14
fed.cloudflareaccess.comNot in the scope2026-11-14
access-scout.fed.cloudflareaccess.comvpnNot in the scope2026-11-14
federationbroker.cloudflareaccess.comNot in the scope2026-11-14
feenstra.cloudflareaccess.comNot in the scope2026-11-14
feldi.cloudflareaccess.comNot in the scope2026-11-14
fello1.cloudflareaccess.comNot in the scope2026-11-14
feniksfilm.cloudflareaccess.comNot in the scope2026-11-14
ffmehring.cloudflareaccess.comNot in the scope2026-11-14
fhsinc.cloudflareaccess.comNot in the scope2026-11-14
fif.cloudflareaccess.comNot in the scope2026-11-14
fifthstreetdigital.cloudflareaccess.comNot in the scope2026-11-14
figma.cloudflareaccess.comNot in the scope2026-11-14
figma1.cloudflareaccess.comNot in the scope2026-11-14
filiosoft.cloudflareaccess.comNot in the scope2026-11-14
fillmorephx.cloudflareaccess.comNot in the scope2026-11-14
financescout24.cloudflareaccess.comNot in the scope2026-11-14
finanzfluss.cloudflareaccess.comNot in the scope2026-11-14
finarywealth.cloudflareaccess.comNot in the scope2026-11-14
fincent.cloudflareaccess.comNot in the scope2026-11-14
finch.cloudflareaccess.comNot in the scope2026-11-14
finejeweleryshopgoldandsilver.cloudflareaccess.comNot in the scope2026-11-14
finn-app.cloudflareaccess.comNot in the scope2026-11-14
finpoints-passport.cloudflareaccess.comNot in the scope2026-11-14
firebird.cloudflareaccess.comNot in the scope2026-11-14
fireengland.cloudflareaccess.comNot in the scope2026-11-14
firewallcenters.cloudflareaccess.comNot in the scope2026-11-14
firewatch2.cloudflareaccess.comNot in the scope2026-11-14
firmmedia.cloudflareaccess.comNot in the scope2026-11-14
firstclasswatches.cloudflareaccess.comNot in the scope2026-11-14
fischerslab.cloudflareaccess.comNot in the scope2026-11-14
fishonfire.cloudflareaccess.comNot in the scope2026-11-14
fishy.cloudflareaccess.comNot in the scope2026-11-14
fitanalytics.cloudflareaccess.comNot in the scope2026-11-14
fitch-network-auth.cloudflareaccess.comauthNot in the scope2026-11-14
fitnet.cloudflareaccess.comNot in the scope2026-11-14
fitogram.cloudflareaccess.comNot in the scope2026-11-14
fixion.cloudflareaccess.comNot in the scope2026-11-14
fiyo.cloudflareaccess.comNot in the scope2026-11-14
fj.cloudflareaccess.comNot in the scope2026-11-14
fkit.cloudflareaccess.comNot in the scope2026-11-14
flare.cloudflareaccess.comNot in the scope2026-11-14
flawtrack.cloudflareaccess.comNot in the scope2026-11-14
fleggaard.cloudflareaccess.comNot in the scope2026-11-14
fleurop.cloudflareaccess.comNot in the scope2026-11-14
flexigroup.cloudflareaccess.comNot in the scope2026-11-14
flexoffers.cloudflareaccess.comNot in the scope2026-11-14
flexsimweb.cloudflareaccess.comNot in the scope2026-11-14
flippa.cloudflareaccess.comNot in the scope2026-11-14
flkrs.cloudflareaccess.comNot in the scope2026-11-14
flobamedia.cloudflareaccess.comNot in the scope2026-11-14
flohealth.cloudflareaccess.comNot in the scope2026-11-14
floraqueen.cloudflareaccess.comNot in the scope2026-11-14
flowtheroom.cloudflareaccess.comNot in the scope2026-11-14
flsdtunnel.cloudflareaccess.comNot in the scope2026-11-14
fluentcity.cloudflareaccess.comNot in the scope2026-11-14
fluidnet.cloudflareaccess.comNot in the scope2026-11-14
flutter-uki-dev.cloudflareaccess.comdevNot in the scope2026-11-14
fluvi.cloudflareaccess.comNot in the scope2026-11-14
fluxserver.cloudflareaccess.comNot in the scope2026-11-14
flyaria.cloudflareaccess.comNot in the scope2026-11-14
flyingbeds.cloudflareaccess.comNot in the scope2026-11-14
flyingjetmonkey.cloudflareaccess.comNot in the scope2026-11-14
flynewshepard.cloudflareaccess.comNot in the scope2026-11-14
flyswoop.cloudflareaccess.comNot in the scope2026-11-14
flyt.cloudflareaccess.comNot in the scope2026-11-14
flyvictor.cloudflareaccess.comNot in the scope2026-11-14
flywire.cloudflareaccess.comNot in the scope2026-11-14
flywirelol.cloudflareaccess.comNot in the scope2026-11-14
fmw.cloudflareaccess.comNot in the scope2026-11-14
fn.cloudflareaccess.comNot in the scope2026-11-14
fna.cloudflareaccess.comNot in the scope2026-11-14
fnzweb.cloudflareaccess.comNot in the scope2026-11-14
focusgroup.cloudflareaccess.comNot in the scope2026-11-14
focusur.cloudflareaccess.comNot in the scope2026-11-14
fogaonet.cloudflareaccess.comNot in the scope2026-11-14
fold.cloudflareaccess.comNot in the scope2026-11-14
folio3.cloudflareaccess.comNot in the scope2026-11-14
fontanelles.cloudflareaccess.comNot in the scope2026-11-14
foodpanda.cloudflareaccess.comNot in the scope2026-11-14
foodstandard.cloudflareaccess.comNot in the scope2026-11-14
foolio.cloudflareaccess.comNot in the scope2026-11-14
foolish.cloudflareaccess.comNot in the scope2026-11-14
fore.cloudflareaccess.comNot in the scope2026-11-14
forensic-analytics-ai.cloudflareaccess.comNot in the scope2026-11-14
forevrgames.cloudflareaccess.comNot in the scope2026-11-14
forium.cloudflareaccess.comNot in the scope2026-11-14
formaldehydetech.cloudflareaccess.comNot in the scope2026-11-14
formspree.cloudflareaccess.comNot in the scope2026-11-14
forum.cloudflareaccess.comNot in the 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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