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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
dean.ns.cloudflare.comIn scope2026-11-14
deb.ns.cloudflare.comIn scope2026-11-14
debe.ns.cloudflare.comIn scope2026-11-14
deborah.ns.cloudflare.comIn scope2026-11-14
decker.ns.cloudflare.comIn scope2026-11-14
dee.ns.cloudflare.comIn scope2026-11-14
delilah.ns.cloudflare.comIn scope2026-11-14
dell.ns.cloudflare.comIn scope2026-11-14
root.dell.ns.cloudflare.comIn scope2026-11-14
demi.ns.cloudflare.comIn scope2026-11-14
denver.ns.cloudflare.comIn scope2026-11-14
derek.ns.cloudflare.comIn scope2026-11-14
desi.ns.cloudflare.comIn scope2026-11-14
desiree.ns.cloudflare.comIn scope2026-11-14
destiny.ns.cloudflare.comIn scope2026-11-14
devin.ns.cloudflare.comIn scope2026-11-14
dexter.ns.cloudflare.comIn scope2026-11-14
diana.ns.cloudflare.comIn scope2026-11-14
dibert.ns.cloudflare.comIn scope2026-11-14
dilbert.ns.cloudflare.comIn scope2026-11-14
dimitris.ns.cloudflare.comIn scope2026-11-14
dina.ns.cloudflare.comIn scope2026-11-14
dion.ns.cloudflare.comIn scope2026-11-14
ns2.dion.ns.cloudflare.comIn scope2026-11-14
diva.ns.cloudflare.comIn scope2026-11-14
dna.ns.cloudflare.comIn scope2026-11-14
do.ns.cloudflare.comIn scope2026-11-14
dolly.ns.cloudflare.comIn scope2026-11-14
dom.ns.cloudflare.comIn scope2026-11-14
donald.ns.cloudflare.comIn scope2026-11-14
ns2.donald.ns.cloudflare.comIn scope2026-11-14
donna.ns.cloudflare.comIn scope2026-11-14
donovan.ns.cloudflare.comIn scope2026-11-14
dora.ns.cloudflare.comIn scope2026-11-14
dorthy.ns.cloudflare.comIn scope2026-11-14
doug.ns.cloudflare.comIn scope2026-11-14
drake.ns.cloudflare.comIn scope2026-11-14
drawin.ns.cloudflare.comIn scope2026-11-14
drew.ns.cloudflare.comIn scope2026-11-14
mx0.drew.ns.cloudflare.comIn scope2026-11-14
ns1.drew.ns.cloudflare.comIn scope2026-11-14
duke.ns.cloudflare.comIn scope2026-11-14
root.duke.ns.cloudflare.comIn scope2026-11-14
dy.ns.cloudflare.comIn scope2026-11-14
dylan.ns.cloudflare.comIn scope2026-11-14
earl.ns.cloudflare.comIn scope2026-11-14
ed.ns.cloudflare.comIn scope2026-11-14
server.ed.ns.cloudflare.comIn scope2026-11-14
edified.ns.cloudflare.comIn scope2026-11-14
edna.ns.cloudflare.comIn scope2026-11-14
edward.ns.cloudflare.comIn scope2026-11-14
elaine.ns.cloudflare.comIn scope2026-11-14
eleanor.ns.cloudflare.comIn scope2026-11-14
elias.ns.cloudflare.comIn scope2026-11-14
elijah.ns.cloudflare.comIn scope2026-11-14
elinore.ns.cloudflare.comIn scope2026-11-14
elisa.ns.cloudflare.comIn scope2026-11-14
elisabeth.ns.cloudflare.comIn scope2026-11-14
ella.ns.cloudflare.comIn scope2026-11-14
elle.ns.cloudflare.comIn scope2026-11-14
elliot.ns.cloudflare.comIn scope2026-11-14
elliotn.ns.cloudflare.comIn scope2026-11-14
elliott.ns.cloudflare.comIn scope2026-11-14
elly.ns.cloudflare.comIn scope2026-11-14
elma.ns.cloudflare.comIn scope2026-11-14
elmazx.ns.cloudflare.comIn scope2026-11-14
elmo.ns.cloudflare.comIn scope2026-11-14
eloise.ns.cloudflare.comIn scope2026-11-14
elom.ns.cloudflare.comIn scope2026-11-14
elsa.ns.cloudflare.comIn scope2026-11-14
emely.ns.cloudflare.comIn scope2026-11-14
emerie.ns.cloudflare.comIn scope2026-11-14
emerson.ns.cloudflare.comIn scope2026-11-14
emily.ns.cloudflare.comIn scope2026-11-14
emma.ns.cloudflare.comIn scope2026-11-14
eoin.ns.cloudflare.comIn scope2026-11-14
era.ns.cloudflare.comIn scope2026-11-14
eric.ns.cloudflare.comIn scope2026-11-14
erica.ns.cloudflare.comIn scope2026-11-14
erin.ns.cloudflare.comIn scope2026-11-14
erkenbrand.ns.cloudflare.comIn scope2026-11-14
ernest.ns.cloudflare.comIn scope2026-11-14
erry.ns.cloudflare.comIn scope2026-11-14
essica.ns.cloudflare.comIn scope2026-11-14
ethan.ns.cloudflare.comIn scope2026-11-14
etienne.ns.cloudflare.comIn scope2026-11-14
etta.ns.cloudflare.comIn scope2026-11-14
eugene.ns.cloudflare.comIn scope2026-11-14
eva.ns.cloudflare.comIn scope2026-11-14
sh-dns01.eva.ns.cloudflare.comIn scope2026-11-14
evan.ns.cloudflare.comIn scope2026-11-14
evangeline.ns.cloudflare.comIn scope2026-11-14
eve.ns.cloudflare.comIn scope2026-11-14
evelyn.ns.cloudflare.comIn scope2026-11-14
everton.ns.cloudflare.comIn scope2026-11-14
ezra.ns.cloudflare.comIn scope2026-11-14
fatima.ns.cloudflare.comIn scope2026-11-14
fattouche.ns.cloudflare.comIn scope2026-11-14
fay.ns.cloudflare.comIn scope2026-11-14
fay1.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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