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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
celeste.ns.cloudflare.comIn scope2026-11-14
celine.ns.cloudflare.comIn scope2026-11-14
celyn.ns.cloudflare.comIn scope2026-11-14
cesar.ns.cloudflare.comIn scope2026-11-14
chad.ns.cloudflare.comIn scope2026-11-14
ns1.chad.ns.cloudflare.comIn scope2026-11-14
chan.ns.cloudflare.comIn scope2026-11-14
chance.ns.cloudflare.comIn scope2026-11-14
charles.ns.cloudflare.comIn scope2026-11-14
chase.ns.cloudflare.comIn scope2026-11-14
chelsea.ns.cloudflare.comIn scope2026-11-14
cheryl.ns.cloudflare.comIn scope2026-11-14
vps.cheryl.ns.cloudflare.comIn scope2026-11-14
chin.ns.cloudflare.comIn scope2026-11-14
chip.ns.cloudflare.comIn scope2026-11-14
vps.chip.ns.cloudflare.comIn scope2026-11-14
chloe.ns.cloudflare.comIn scope2026-11-14
139.180.156.140.chloe.ns.cloudflare.comIn scope2026-11-14
ns1.chloe.ns.cloudflare.comIn scope2026-11-14
chris.ns.cloudflare.comIn scope2026-11-14
christian.ns.cloudflare.comIn scope2026-11-14
christina.ns.cloudflare.comIn scope2026-11-14
chuck.ns.cloudflare.comIn scope2026-11-14
clara.ns.cloudflare.comIn scope2026-11-14
clarissa.ns.cloudflare.comIn scope2026-11-14
clark.ns.cloudflare.comIn scope2026-11-14
clay.ns.cloudflare.comIn scope2026-11-14
clayton.ns.cloudflare.comIn scope2026-11-14
cleo.ns.cloudflare.comIn scope2026-11-14
clint.ns.cloudflare.comIn scope2026-11-14
cloe.ns.cloudflare.comIn scope2026-11-14
clyde.ns.cloudflare.comIn scope2026-11-14
coby.ns.cloudflare.comIn scope2026-11-14
coco.ns.cloudflare.comIn scope2026-11-14
hostmaster.coco.ns.cloudflare.comIn scope2026-11-14
cody.ns.cloudflare.comIn scope2026-11-14
coen.ns.cloudflare.comIn scope2026-11-14
cole.ns.cloudflare.comIn scope2026-11-14
coleman.ns.cloudflare.comIn scope2026-11-14
colette.ns.cloudflare.comIn scope2026-11-14
colin.ns.cloudflare.comIn scope2026-11-14
collins.ns.cloudflare.comIn scope2026-11-14
ns1.a2hosting.com.ns.cloudflare.comIn scope2026-11-14
ns1.mydomain.combecky.ns.cloudflare.comIn scope2026-11-14
comcortney.ns.cloudflare.comIn scope2026-11-14
b.dnspod.comdan.ns.cloudflare.comIn scope2026-11-14
ns2.mydomain.comgabe.ns.cloudflare.comIn scope2026-11-14
ns2.a2hosting.comlisa.ns.cloudflare.comIn scope2026-11-14
ns2.dynu.comnina.ns.cloudflare.comIn scope2026-11-14
connie.ns.cloudflare.comIn scope2026-11-14
conrad.ns.cloudflare.comIn scope2026-11-14
cora.ns.cloudflare.comIn scope2026-11-14
coraline.ns.cloudflare.comIn scope2026-11-14
corey.ns.cloudflare.comIn scope2026-11-14
corobin.ns.cloudflare.comIn scope2026-11-14
cortney.ns.cloudflare.comIn scope2026-11-14
cory.ns.cloudflare.comIn scope2026-11-14
cosmin.ns.cloudflare.comIn scope2026-11-14
courtney.ns.cloudflare.comIn scope2026-11-14
craig.ns.cloudflare.comIn scope2026-11-14
cris.ns.cloudflare.comIn scope2026-11-14
cruz.ns.cloudflare.comIn scope2026-11-14
crystal.ns.cloudflare.comIn scope2026-11-14
cullen.ns.cloudflare.comIn scope2026-11-14
cuntaydin.ns.cloudflare.comIn scope2026-11-14
curt.ns.cloudflare.comIn scope2026-11-14
da.ns.cloudflare.comIn scope2026-11-14
dahlia.ns.cloudflare.comIn scope2026-11-14
daisy.ns.cloudflare.comIn scope2026-11-14
dakota.ns.cloudflare.comIn scope2026-11-14
dalary.ns.cloudflare.comIn scope2026-11-14
dale.ns.cloudflare.comIn scope2026-11-14
dalia.ns.cloudflare.comIn scope2026-11-14
damian.ns.cloudflare.comIn scope2026-11-14
damien.ns.cloudflare.comIn scope2026-11-14
damiete.ns.cloudflare.comIn scope2026-11-14
damon.ns.cloudflare.comIn scope2026-11-14
dan.ns.cloudflare.comIn scope2026-11-14
root.dan.ns.cloudflare.comIn scope2026-11-14
dana.ns.cloudflare.comIn scope2026-11-14
dane.ns.cloudflare.comIn scope2026-11-14
danica.ns.cloudflare.comIn scope2026-11-14
daniella.ns.cloudflare.comIn scope2026-11-14
dans.ns.cloudflare.comIn scope2026-11-14
dante.ns.cloudflare.comIn scope2026-11-14
daphne.ns.cloudflare.comIn scope2026-11-14
dara.ns.cloudflare.comIn scope2026-11-14
darl.ns.cloudflare.comIn scope2026-11-14
katiaesteban.info.darl.ns.cloudflare.comIn scope2026-11-14
darwin.ns.cloudflare.comIn scope2026-11-14
dav.ns.cloudflare.comIn scope2026-11-14
dave.ns.cloudflare.comIn scope2026-11-14
david.ns.cloudflare.comIn scope2026-11-14
davina.ns.cloudflare.comIn scope2026-11-14
davis.ns.cloudflare.comIn scope2026-11-14
dawn.ns.cloudflare.comIn scope2026-11-14
mx1.dawn.ns.cloudflare.comIn scope2026-11-14
dax.ns.cloudflare.comIn scope2026-11-14
dayana.ns.cloudflare.comIn scope2026-11-14
dddi.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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