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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
aarav.ns.cloudflare.comIn scope2026-11-14
aaron.ns.cloudflare.comIn scope2026-11-14
abby.ns.cloudflare.comIn scope2026-11-14
abdullah.ns.cloudflare.comIn scope2026-11-14
abel.ns.cloudflare.comIn scope2026-11-14
abigail.ns.cloudflare.comIn scope2026-11-14
abuja.ns.cloudflare.comIn scope2026-11-14
ace.ns.cloudflare.comIn scope2026-11-14
achiel.ns.cloudflare.comIn scope2026-11-14
ada.ns.cloudflare.comIn scope2026-11-14
adaline.ns.cloudflare.comIn scope2026-11-14
adam.ns.cloudflare.comIn scope2026-11-14
addilyn.ns.cloudflare.comIn scope2026-11-14
addyson.ns.cloudflare.comIn scope2026-11-14
adel.ns.cloudflare.comIn scope2026-11-14
adelaide.ns.cloudflare.comIn scope2026-11-14
adele.ns.cloudflare.comIn scope2026-11-14
adi.ns.cloudflare.comIn scope2026-11-14
adrian.ns.cloudflare.comIn scope2026-11-14
agustin.ns.cloudflare.comIn scope2026-11-14
aida.ns.cloudflare.comIn scope2026-11-14
aiden.ns.cloudflare.comIn scope2026-11-14
ainsley.ns.cloudflare.comIn scope2026-11-14
ns1.ainsley.ns.cloudflare.comIn scope2026-11-14
aisha.ns.cloudflare.comIn scope2026-11-14
aitana.ns.cloudflare.comIn scope2026-11-14
ajay.ns.cloudflare.comIn scope2026-11-14
alaia.ns.cloudflare.comIn scope2026-11-14
alan.ns.cloudflare.comIn scope2026-11-14
alaric.ns.cloudflare.comIn scope2026-11-14
albert.ns.cloudflare.comIn scope2026-11-14
alberto.ns.cloudflare.comIn scope2026-11-14
aldo.ns.cloudflare.comIn scope2026-11-14
ale.ns.cloudflare.comIn scope2026-11-14
alec.ns.cloudflare.comIn scope2026-11-14
aleena.ns.cloudflare.comIn scope2026-11-14
alex.ns.cloudflare.comIn scope2026-11-14
alexa.ns.cloudflare.comIn scope2026-11-14
alexandra.ns.cloudflare.comIn scope2026-11-14
alexia.ns.cloudflare.comIn scope2026-11-14
alexis.ns.cloudflare.comIn scope2026-11-14
alfred.ns.cloudflare.comIn scope2026-11-14
algin.ns.cloudflare.comIn scope2026-11-14
ali.ns.cloudflare.comIn scope2026-11-14
alice.ns.cloudflare.comIn scope2026-11-14
alina.ns.cloudflare.comIn scope2026-11-14
ns1.alina.ns.cloudflare.comIn scope2026-11-14
aliza.ns.cloudflare.comIn scope2026-11-14
alla.ns.cloudflare.comIn scope2026-11-14
amalia.ns.cloudflare.comIn scope2026-11-14
amanda.ns.cloudflare.comIn scope2026-11-14
amber.ns.cloudflare.comIn scope2026-11-14
amir.ns.cloudflare.comIn scope2026-11-14
amit.ns.cloudflare.comIn scope2026-11-14
ammy.ns.cloudflare.comIn scope2026-11-14
amos.ns.cloudflare.comIn scope2026-11-14
amy.ns.cloudflare.comIn scope2026-11-14
anahi.ns.cloudflare.comIn scope2026-11-14
anastasia.ns.cloudflare.comIn scope2026-11-14
anderson.ns.cloudflare.comIn scope2026-11-14
andronicus.ns.cloudflare.comIn scope2026-11-14
andy.ns.cloudflare.comIn scope2026-11-14
dns1.andy.ns.cloudflare.comIn scope2026-11-14
angela.ns.cloudflare.comIn scope2026-11-14
ns1.angela.ns.cloudflare.comIn scope2026-11-14
angelina.ns.cloudflare.comIn scope2026-11-14
anirban.ns.cloudflare.comIn scope2026-11-14
80-78-246-159.anirban.ns.cloudflare.comIn scope2026-11-14
anita.ns.cloudflare.comIn scope2026-11-14
ann.ns.cloudflare.comIn scope2026-11-14
anna.ns.cloudflare.comIn scope2026-11-14
hostmaster.anna.ns.cloudflare.comIn scope2026-11-14
annabel.ns.cloudflare.comIn scope2026-11-14
annalise.ns.cloudflare.comIn scope2026-11-14
annna.ns.cloudflare.comIn scope2026-11-14
anton.ns.cloudflare.comIn scope2026-11-14
anucass.ns.cloudflare.comIn scope2026-11-14
anuj.ns.cloudflare.comIn scope2026-11-14
apollo.ns.cloudflare.comIn scope2026-11-14
apoollo.ns.cloudflare.comIn scope2026-11-14
appolo.ns.cloudflare.comIn scope2026-11-14
april.ns.cloudflare.comIn scope2026-11-14
ara.ns.cloudflare.comIn scope2026-11-14
aragorn.ns.cloudflare.comIn scope2026-11-14
arch.ns.cloudflare.comIn scope2026-11-14
archer.ns.cloudflare.comIn scope2026-11-14
arely.ns.cloudflare.comIn scope2026-11-14
aria.ns.cloudflare.comIn scope2026-11-14
ariadne.ns.cloudflare.comIn scope2026-11-14
ariana.ns.cloudflare.comIn scope2026-11-14
ariel.ns.cloudflare.comIn scope2026-11-14
ariella.ns.cloudflare.comIn scope2026-11-14
armando.ns.cloudflare.comIn scope2026-11-14
armfazh.ns.cloudflare.comIn scope2026-11-14
arnold.ns.cloudflare.comIn scope2026-11-14
aron.ns.cloudflare.comIn scope2026-11-14
art.ns.cloudflare.comIn scope2026-11-14
art1.ns.cloudflare.comIn scope2026-11-14
arturo.ns.cloudflare.comIn scope2026-11-14
arushi.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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