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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
ina.ns.cloudflare.comIn scope2026-11-14
inda.ns.cloudflare.comIn scope2026-11-14
indie.ns.cloudflare.comIn scope2026-11-14
ines.ns.cloudflare.comIn scope2026-11-14
ingrid.ns.cloudflare.comIn scope2026-11-14
irena.ns.cloudflare.comIn scope2026-11-14
iris.ns.cloudflare.comIn scope2026-11-14
irma.ns.cloudflare.comIn scope2026-11-14
isaac.ns.cloudflare.comIn scope2026-11-14
hostmaster.isaac.ns.cloudflare.comIn scope2026-11-14
isabel.ns.cloudflare.comIn scope2026-11-14
ishaan.ns.cloudflare.comIn scope2026-11-14
isla.ns.cloudflare.comIn scope2026-11-14
ita.ns.cloudflare.comIn scope2026-11-14
itin.ns.cloudflare.comIn scope2026-11-14
itzel.ns.cloudflare.comIn scope2026-11-14
iva.ns.cloudflare.comIn scope2026-11-14
ivan.ns.cloudflare.comIn scope2026-11-14
ivy.ns.cloudflare.comIn scope2026-11-14
ugalaxia.com.ivy.ns.cloudflare.comIn scope2026-11-14
www.ivy.ns.cloudflare.comIn scope2026-11-14
izabella.ns.cloudflare.comIn scope2026-11-14
jack.ns.cloudflare.comIn scope2026-11-14
jacob.ns.cloudflare.comIn scope2026-11-14
jacqueline.ns.cloudflare.comIn scope2026-11-14
jade.ns.cloudflare.comIn scope2026-11-14
jaime.ns.cloudflare.comIn scope2026-11-14
jaimie.ns.cloudflare.comIn scope2026-11-14
jake.ns.cloudflare.comIn scope2026-11-14
root.jake.ns.cloudflare.comIn scope2026-11-14
jakub.ns.cloudflare.comIn scope2026-11-14
jalan.ns.cloudflare.comIn scope2026-11-14
james.ns.cloudflare.comIn scope2026-11-14
jade.ns.james.ns.cloudflare.comIn scope2026-11-14
jamie.ns.cloudflare.comIn scope2026-11-14
jamy.ns.cloudflare.comIn scope2026-11-14
janet.ns.cloudflare.comIn scope2026-11-14
dns1.janet.ns.cloudflare.comIn scope2026-11-14
jarred.ns.cloudflare.comIn scope2026-11-14
jask.ns.cloudflare.comIn scope2026-11-14
jasmin.ns.cloudflare.comIn scope2026-11-14
jasmine.ns.cloudflare.comIn scope2026-11-14
jason.ns.cloudflare.comIn scope2026-11-14
jasper.ns.cloudflare.comIn scope2026-11-14
javier.ns.cloudflare.comIn scope2026-11-14
javon.ns.cloudflare.comIn scope2026-11-14
jaxson.ns.cloudflare.comIn scope2026-11-14
jay.ns.cloudflare.comIn scope2026-11-14
jaziel.ns.cloudflare.comIn scope2026-11-14
jean.ns.cloudflare.comIn scope2026-11-14
jeff.ns.cloudflare.comIn scope2026-11-14
jen.ns.cloudflare.comIn scope2026-11-14
jenet.ns.cloudflare.comIn scope2026-11-14
jeremy.ns.cloudflare.comIn scope2026-11-14
jeremyl.ns.cloudflare.comIn scope2026-11-14
jermaine.ns.cloudflare.comIn scope2026-11-14
jerome.ns.cloudflare.comIn scope2026-11-14
jerry.ns.cloudflare.comIn scope2026-11-14
jessica.ns.cloudflare.comIn scope2026-11-14
ns1.jessica.ns.cloudflare.comIn scope2026-11-14
jewel.ns.cloudflare.comIn scope2026-11-14
jihoon.ns.cloudflare.comIn scope2026-11-14
jil.ns.cloudflare.comIn scope2026-11-14
jill.ns.cloudflare.comIn scope2026-11-14
root.jill.ns.cloudflare.comIn scope2026-11-14
jillian.ns.cloudflare.comIn scope2026-11-14
jim.ns.cloudflare.comIn scope2026-11-14
jimmy.ns.cloudflare.comIn scope2026-11-14
jo.ns.cloudflare.comIn scope2026-11-14
joan.ns.cloudflare.comIn scope2026-11-14
joaquin.ns.cloudflare.comIn scope2026-11-14
jobs.ns.cloudflare.comIn scope2026-11-14
jocelyn.ns.cloudflare.comIn scope2026-11-14
joe.ns.cloudflare.comIn scope2026-11-14
joel.ns.cloudflare.comIn scope2026-11-14
john.ns.cloudflare.comIn scope2026-11-14
johnathan.ns.cloudflare.comIn scope2026-11-14
johnny.ns.cloudflare.comIn scope2026-11-14
jonah.ns.cloudflare.comIn scope2026-11-14
jose.ns.cloudflare.comIn scope2026-11-14
joselyn.ns.cloudflare.comIn scope2026-11-14
josephine.ns.cloudflare.comIn scope2026-11-14
josh.ns.cloudflare.comIn scope2026-11-14
journey.ns.cloudflare.comIn scope2026-11-14
joyce.ns.cloudflare.comIn scope2026-11-14
jule.ns.cloudflare.comIn scope2026-11-14
julian.ns.cloudflare.comIn scope2026-11-14
julio.ns.cloudflare.comIn scope2026-11-14
julissa.ns.cloudflare.comIn scope2026-11-14
junade.ns.cloudflare.comIn scope2026-11-14
june.ns.cloudflare.comIn scope2026-11-14
justin.ns.cloudflare.comIn scope2026-11-14
kai.ns.cloudflare.comIn scope2026-11-14
kaiser.ns.cloudflare.comIn scope2026-11-14
kallie.ns.cloudflare.comIn scope2026-11-14
kami.ns.cloudflare.comIn scope2026-11-14
kanye.ns.cloudflare.comIn scope2026-11-14
kara.ns.cloudflare.comIn scope2026-11-14
kareem.ns.cloudflare.comIn scope2026-11-14
karina.ns.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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