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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
hegbr.cloudflareaccess.comNot in the scope2026-11-14
helcim.cloudflareaccess.comNot in the scope2026-11-14
helinea.cloudflareaccess.comNot in the scope2026-11-14
helloiamoliver.cloudflareaccess.comNot in the scope2026-11-14
hellosoda-facility.cloudflareaccess.comNot in the scope2026-11-14
help.cloudflareaccess.comNot in the scope2026-11-14
hemnet.cloudflareaccess.comNot in the scope2026-11-14
hemofiliaorg.cloudflareaccess.comNot in the scope2026-11-14
hemros.cloudflareaccess.comNot in the scope2026-11-14
henriquesanchez.cloudflareaccess.comNot in the scope2026-11-14
hepherius.cloudflareaccess.comNot in the scope2026-11-14
heritage.cloudflareaccess.comNot in the scope2026-11-14
heritageaction.cloudflareaccess.comNot in the scope2026-11-14
heritagetype.cloudflareaccess.comNot in the scope2026-11-14
heroic.cloudflareaccess.comNot in the scope2026-11-14
herrontech.cloudflareaccess.comNot in the scope2026-11-14
hexandcube.cloudflareaccess.comNot in the scope2026-11-14
hexbr.cloudflareaccess.comNot in the scope2026-11-14
hexide.cloudflareaccess.comNot in the scope2026-11-14
heyben.cloudflareaccess.comNot in the scope2026-11-14
heygoody.cloudflareaccess.comNot in the scope2026-11-14
hgn.cloudflareaccess.comNot in the scope2026-11-14
hhavoc.cloudflareaccess.comNot in the scope2026-11-14
hifocus.cloudflareaccess.comNot in the scope2026-11-14
hillarysolterbeckteam.cloudflareaccess.comNot in the scope2026-11-14
hillrpg.cloudflareaccess.comNot in the scope2026-11-14
hillsongcfsso.cloudflareaccess.comNot in the scope2026-11-14
himalaya.cloudflareaccess.comNot in the scope2026-11-14
historyplay.cloudflareaccess.comNot in the scope2026-11-14
hisusamis.cloudflareaccess.comNot in the scope2026-11-14
hizoo.cloudflareaccess.comNot in the scope2026-11-14
hjartarson.cloudflareaccess.comNot in the scope2026-11-14
hkplotiobullion.cloudflareaccess.comNot in the scope2026-11-14
hln.cloudflareaccess.comNot in the scope2026-11-14
hlog.cloudflareaccess.comNot in the scope2026-11-14
hmtp.cloudflareaccess.comNot in the scope2026-11-14
hnycmb.cloudflareaccess.comNot in the scope2026-11-14
hoa-express-dev.cloudflareaccess.comdevNot in the scope2026-11-14
hobbyist3d.cloudflareaccess.comNot in the scope2026-11-14
hoddereducation.cloudflareaccess.comNot in the scope2026-11-14
hodi.cloudflareaccess.comNot in the scope2026-11-14
hoekbrwr.cloudflareaccess.comNot in the scope2026-11-14
holdenfamilyfarm.cloudflareaccess.comNot in the scope2026-11-14
holycross.cloudflareaccess.comNot in the scope2026-11-14
homburg.cloudflareaccess.comNot in the scope2026-11-14
home.cloudflareaccess.comNot in the scope2026-11-14
homeit-system.cloudflareaccess.comNot in the scope2026-11-14
homelabwiki.cloudflareaccess.comNot in the scope2026-11-14
hometogo.cloudflareaccess.comNot in the scope2026-11-14
hongoblogs.cloudflareaccess.comNot in the scope2026-11-14
honynews.cloudflareaccess.comNot in the scope2026-11-14
honzik.cloudflareaccess.comNot in the scope2026-11-14
hoogantink.cloudflareaccess.comNot in the scope2026-11-14
hornecyber.cloudflareaccess.comNot in the scope2026-11-14
hornellp.cloudflareaccess.comNot in the scope2026-11-14
hospedaliacom.cloudflareaccess.comNot in the scope2026-11-14
hospitalcare.cloudflareaccess.comNot in the scope2026-11-14
host.cloudflareaccess.comNot in the scope2026-11-14
hostetler.cloudflareaccess.comNot in the scope2026-11-14
hosthavoc.cloudflareaccess.comNot in the scope2026-11-14
hostmaster.cloudflareaccess.comNot in the scope2026-11-14
hotelcz.cloudflareaccess.comNot in the scope2026-11-14
hotupa.cloudflareaccess.comNot in the scope2026-11-14
houdininftbeta-pages.cloudflareaccess.comNot in the scope2026-11-14
houseplans.cloudflareaccess.comNot in the scope2026-11-14
hovuu.cloudflareaccess.comNot in the scope2026-11-14
hoyboys.cloudflareaccess.comNot in the scope2026-11-14
hpstock.cloudflareaccess.comNot in the scope2026-11-14
hsipswich.cloudflareaccess.comNot in the scope2026-11-14
hsproductions.cloudflareaccess.comNot in the scope2026-11-14
ht-services.cloudflareaccess.comNot in the scope2026-11-14
htcit.cloudflareaccess.comNot in the scope2026-11-14
httpbin.cloudflareaccess.comNot in the scope2026-11-14
huaray.cloudflareaccess.comNot in the scope2026-11-14
hubelia.cloudflareaccess.comNot in the scope2026-11-14
hubspotcentral.cloudflareaccess.comNot in the scope2026-11-14
hubteam-com.cloudflareaccess.comNot in the scope2026-11-14
hugoapp.cloudflareaccess.comNot in the scope2026-11-14
hulluniunion.cloudflareaccess.comNot in the scope2026-11-14
humanear.cloudflareaccess.comNot in the scope2026-11-14
humankode.cloudflareaccess.comNot in the scope2026-11-14
hungrydk.cloudflareaccess.comNot in the scope2026-11-14
hunter.cloudflareaccess.comNot in the scope2026-11-14
huntingboar.cloudflareaccess.comNot in the scope2026-11-14
hurricane-nl.cloudflareaccess.comNot in the scope2026-11-14
hyperair.cloudflareaccess.comNot in the scope2026-11-14
hyperativa.cloudflareaccess.comNot in the scope2026-11-14
hyperativacfsso.cloudflareaccess.comNot in the scope2026-11-14
hyperbolic.cloudflareaccess.comNot in the scope2026-11-14
hyperdrug.cloudflareaccess.comNot in the scope2026-11-14
hyphae.cloudflareaccess.comNot in the scope2026-11-14
hypixel.cloudflareaccess.comNot in the scope2026-11-14
hytale.cloudflareaccess.comNot in the scope2026-11-14
iaa.cloudflareaccess.comNot in the scope2026-11-14
iael.cloudflareaccess.comNot in the scope2026-11-14
iam.cloudflareaccess.comauthNot in the scope2026-11-14
iarii.cloudflareaccess.comNot in the scope2026-11-14
iasme.cloudflareaccess.comNot in the scope2026-11-14
ibenews.cloudflareaccess.comNot in the scope2026-11-14
ibsgroup.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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