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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
arvind.ns.cloudflare.comIn scope2026-11-14
arya.ns.cloudflare.comIn scope2026-11-14
aryanna.ns.cloudflare.comIn scope2026-11-14
asa.ns.cloudflare.comIn scope2026-11-14
ns1.asa.ns.cloudflare.comIn scope2026-11-14
root.ns1.asa.ns.cloudflare.comIn scope2026-11-14
ashley.ns.cloudflare.comIn scope2026-11-14
ashton.ns.cloudflare.comIn scope2026-11-14
ason.ns.cloudflare.comIn scope2026-11-14
aspen.ns.cloudflare.comIn scope2026-11-14
athena.ns.cloudflare.comIn scope2026-11-14
aubrey.ns.cloudflare.comIn scope2026-11-14
audrey.ns.cloudflare.comIn scope2026-11-14
augustus.ns.cloudflare.comIn scope2026-11-14
aurora.ns.cloudflare.comIn scope2026-11-14
austin.ns.cloudflare.comIn scope2026-11-14
autumn.ns.cloudflare.comIn scope2026-11-14
ave.ns.cloudflare.comIn scope2026-11-14
ay.ns.cloudflare.comIn scope2026-11-14
aydincunt.ns.cloudflare.comIn scope2026-11-14
ayla.ns.cloudflare.comIn scope2026-11-14
bailey.ns.cloudflare.comIn scope2026-11-14
banned.ns.cloudflare.comIn scope2026-11-14
banned2.ns.cloudflare.comIn scope2026-11-14
baran.ns.cloudflare.comIn scope2026-11-14
barbara.ns.cloudflare.comIn scope2026-11-14
bart.ns.cloudflare.comIn scope2026-11-14
www.bart.ns.cloudflare.comIn scope2026-11-14
bayan.ns.cloudflare.comIn scope2026-11-14
beau.ns.cloudflare.comIn scope2026-11-14
becky.ns.cloudflare.comIn scope2026-11-14
bella.ns.cloudflare.comIn scope2026-11-14
ben.ns.cloudflare.comIn scope2026-11-14
benedict.ns.cloudflare.comIn scope2026-11-14
beth.ns.cloudflare.comIn scope2026-11-14
dns2.beth.ns.cloudflare.comIn scope2026-11-14
bethany.ns.cloudflare.comIn scope2026-11-14
betty.ns.cloudflare.comIn scope2026-11-14
bill.ns.cloudflare.comIn scope2026-11-14
bingo.ns.cloudflare.comIn scope2026-11-14
bio.ns.cloudflare.comIn scope2026-11-14
bjorn.ns.cloudflare.comIn scope2026-11-14
blair.ns.cloudflare.comIn scope2026-11-14
blakely.ns.cloudflare.comIn scope2026-11-14
blecky.ns.cloudflare.comIn scope2026-11-14
blocked-dom.ns.cloudflare.comIn scope2026-11-14
blocked-lorna.ns.cloudflare.comIn scope2026-11-14
bob.ns.cloudflare.comIn scope2026-11-14
bonnie.ns.cloudflare.comIn scope2026-11-14
postmaster.bonnie.ns.cloudflare.comIn scope2026-11-14
bowen.ns.cloudflare.comIn scope2026-11-14
boyd.ns.cloudflare.comIn scope2026-11-14
brad.ns.cloudflare.comIn scope2026-11-14
braden.ns.cloudflare.comIn scope2026-11-14
bradley.ns.cloudflare.comIn scope2026-11-14
brady.ns.cloudflare.comIn scope2026-11-14
braelyn.ns.cloudflare.comIn scope2026-11-14
brenda.ns.cloudflare.comIn scope2026-11-14
brenna.ns.cloudflare.comIn scope2026-11-14
brett.ns.cloudflare.comIn scope2026-11-14
sdns-61.com.brett.ns.cloudflare.comIn scope2026-11-14
brian.ns.cloudflare.comIn scope2026-11-14
brianna.ns.cloudflare.comIn scope2026-11-14
ns1.brianna.ns.cloudflare.comIn scope2026-11-14
bristol.ns.cloudflare.comIn scope2026-11-14
brit.ns.cloudflare.comIn scope2026-11-14
brodie.ns.cloudflare.comIn scope2026-11-14
broke.ns.cloudflare.comIn scope2026-11-14
broken.ns.cloudflare.comIn scope2026-11-14
bruce.ns.cloudflare.comIn scope2026-11-14
brucezx.ns.cloudflare.comIn scope2026-11-14
brueinen.ns.cloudflare.comIn scope2026-11-14
bryce.ns.cloudflare.comIn scope2026-11-14
brynne.ns.cloudflare.comIn scope2026-11-14
bucck.ns.cloudflare.comIn scope2026-11-14
buck.ns.cloudflare.comIn scope2026-11-14
bucks.ns.cloudflare.comIn scope2026-11-14
burt.ns.cloudflare.comIn scope2026-11-14
postmaster.burt.ns.cloudflare.comIn scope2026-11-14
byron.ns.cloudflare.comIn scope2026-11-14
cameron.ns.cloudflare.comIn scope2026-11-14
camille.ns.cloudflare.comIn scope2026-11-14
camilo.ns.cloudflare.comIn scope2026-11-14
candy.ns.cloudflare.comIn scope2026-11-14
carioca.ns.cloudflare.comIn scope2026-11-14
carl.ns.cloudflare.comIn scope2026-11-14
hostmaster.carl.ns.cloudflare.comIn scope2026-11-14
carla.ns.cloudflare.comIn scope2026-11-14
carlane.ns.cloudflare.comIn scope2026-11-14
carlos.ns.cloudflare.comIn scope2026-11-14
carmelo.ns.cloudflare.comIn scope2026-11-14
carol.ns.cloudflare.comIn scope2026-11-14
server.carol.ns.cloudflare.comIn scope2026-11-14
carrera.ns.cloudflare.comIn scope2026-11-14
carter.ns.cloudflare.comIn scope2026-11-14
cartman.ns.cloudflare.comIn scope2026-11-14
casey.ns.cloudflare.comIn scope2026-11-14
cash.ns.cloudflare.comIn scope2026-11-14
cass.ns.cloudflare.comIn scope2026-11-14
cecelia.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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