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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
rose.ns.cloudflare.comIn scope2026-11-14
rosemary.ns.cloudflare.comIn scope2026-11-14
roxy.ns.cloudflare.comIn scope2026-11-14
ns1.reg.ruanna.ns.cloudflare.comIn scope2026-11-14
ruben.ns.cloudflare.comIn scope2026-11-14
ruby.ns.cloudflare.comIn scope2026-11-14
rudy.ns.cloudflare.comIn scope2026-11-14
rustam.ns.cloudflare.comIn scope2026-11-14
ruth.ns.cloudflare.comIn scope2026-11-14
ryan.ns.cloudflare.comIn scope2026-11-14
ryleigh.ns.cloudflare.comIn scope2026-11-14
saac.ns.cloudflare.comIn scope2026-11-14
saanvi.ns.cloudflare.comIn scope2026-11-14
sadra.ns.cloudflare.comIn scope2026-11-14
safia.ns.cloudflare.comIn scope2026-11-14
sage.ns.cloudflare.comIn scope2026-11-14
salvador.ns.cloudflare.comIn scope2026-11-14
sam.ns.cloudflare.comIn scope2026-11-14
mx2.sam.ns.cloudflare.comIn scope2026-11-14
samara.ns.cloudflare.comIn scope2026-11-14
sandra.ns.cloudflare.comIn scope2026-11-14
sandy.ns.cloudflare.comIn scope2026-11-14
santino.ns.cloudflare.comIn scope2026-11-14
sara.ns.cloudflare.comIn scope2026-11-14
sarah.ns.cloudflare.comIn scope2026-11-14
sasha.ns.cloudflare.comIn scope2026-11-14
savanna.ns.cloudflare.comIn scope2026-11-14
scott.ns.cloudflare.comIn scope2026-11-14
seamus.ns.cloudflare.comIn scope2026-11-14
sean.ns.cloudflare.comIn scope2026-11-14
ns4.sean.ns.cloudflare.comIn scope2026-11-14
selah.ns.cloudflare.comIn scope2026-11-14
serena.ns.cloudflare.comIn scope2026-11-14
serenity.ns.cloudflare.comIn scope2026-11-14
sergi.ns.cloudflare.comIn scope2026-11-14
server.ns.cloudflare.comIn scope2026-11-14
seth.ns.cloudflare.comIn scope2026-11-14
sevki.ns.cloudflare.comIn scope2026-11-14
shane.ns.cloudflare.comIn scope2026-11-14
sharon.ns.cloudflare.comIn scope2026-11-14
shaz.ns.cloudflare.comIn scope2026-11-14
shubhi.ns.cloudflare.comIn scope2026-11-14
sid.ns.cloudflare.comIn scope2026-11-14
sierra.ns.cloudflare.comIn scope2026-11-14
sima.ns.cloudflare.comIn scope2026-11-14
simon.ns.cloudflare.comIn scope2026-11-14
simone.ns.cloudflare.comIn scope2026-11-14
sip.ns.cloudflare.comIn scope2026-11-14
sitin.ns.cloudflare.comIn scope2026-11-14
skip.ns.cloudflare.comIn scope2026-11-14
sky.ns.cloudflare.comIn scope2026-11-14
sla.ns.cloudflare.comIn scope2026-11-14
sliv.ns.cloudflare.comIn scope2026-11-14
sloan.ns.cloudflare.comIn scope2026-11-14
slr.ns.cloudflare.comIn scope2026-11-14
sneh.ns.cloudflare.comIn scope2026-11-14
soa.ns.cloudflare.comIn scope2026-11-14
sofia.ns.cloudflare.comIn scope2026-11-14
sonia.ns.cloudflare.comIn scope2026-11-14
sonny.ns.cloudflare.comIn scope2026-11-14
sophia.ns.cloudflare.comIn scope2026-11-14
soso.ns.cloudflare.comIn scope2026-11-14
sreeni.ns.cloudflare.comIn scope2026-11-14
sri.ns.cloudflare.comIn scope2026-11-14
stan.ns.cloudflare.comIn scope2026-11-14
stanley.ns.cloudflare.comIn scope2026-11-14
stella.ns.cloudflare.comIn scope2026-11-14
stephane.ns.cloudflare.comIn scope2026-11-14
sterling.ns.cloudflare.comIn scope2026-11-14
steven.ns.cloudflare.comIn scope2026-11-14
stevie.ns.cloudflare.comIn scope2026-11-14
stuart.ns.cloudflare.comIn scope2026-11-14
ns1.keo.sualgin.ns.cloudflare.comIn scope2026-11-14
sue.ns.cloudflare.comIn scope2026-11-14
sullivan.ns.cloudflare.comIn scope2026-11-14
summer.ns.cloudflare.comIn scope2026-11-14
sun.ns.cloudflare.comIn scope2026-11-14
sunny.ns.cloudflare.comIn scope2026-11-14
sureena.ns.cloudflare.comIn scope2026-11-14
surina.ns.cloudflare.comIn scope2026-11-14
susan.ns.cloudflare.comIn scope2026-11-14
suzanne.ns.cloudflare.comIn scope2026-11-14
sydney.ns.cloudflare.comIn scope2026-11-14
syeef.ns.cloudflare.comIn scope2026-11-14
t.ns.cloudflare.comIn scope2026-11-14
tadeo.ns.cloudflare.comIn scope2026-11-14
tani.ns.cloudflare.comIn scope2026-11-14
tanner.ns.cloudflare.comIn scope2026-11-14
tara.ns.cloudflare.comIn scope2026-11-14
tate.ns.cloudflare.comIn scope2026-11-14
teagan.ns.cloudflare.comIn scope2026-11-14
tegan.ns.cloudflare.comIn scope2026-11-14
teresa.ns.cloudflare.comIn scope2026-11-14
terin.ns.cloudflare.comIn scope2026-11-14
terrie.ns.cloudflare.comIn scope2026-11-14
terry.ns.cloudflare.comIn scope2026-11-14
tess.ns.cloudflare.comIn scope2026-11-14
tessa.ns.cloudflare.comIn scope2026-11-14
thaddeus.ns.cloudflare.comIn scope2026-11-14
thea.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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