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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
karl.ns.cloudflare.comIn scope2026-11-14
karsyn.ns.cloudflare.comIn scope2026-11-14
kate.ns.cloudflare.comIn scope2026-11-14
katelyn.ns.cloudflare.comIn scope2026-11-14
katja.ns.cloudflare.comIn scope2026-11-14
katy.ns.cloudflare.comIn scope2026-11-14
kay.ns.cloudflare.comIn scope2026-11-14
kayden.ns.cloudflare.comIn scope2026-11-14
kayleigh.ns.cloudflare.comIn scope2026-11-14
kc.ns.cloudflare.comIn scope2026-11-14
keanu.ns.cloudflare.comIn scope2026-11-14
keaton.ns.cloudflare.comIn scope2026-11-14
keenan.ns.cloudflare.comIn scope2026-11-14
kehlani.ns.cloudflare.comIn scope2026-11-14
keira.ns.cloudflare.comIn scope2026-11-14
kellen.ns.cloudflare.comIn scope2026-11-14
kelly.ns.cloudflare.comIn scope2026-11-14
ken.ns.cloudflare.comIn scope2026-11-14
kenia.ns.cloudflare.comIn scope2026-11-14
kenneth.ns.cloudflare.comIn scope2026-11-14
kevin.ns.cloudflare.comIn scope2026-11-14
key.ns.cloudflare.comIn scope2026-11-14
keyla.ns.cloudflare.comIn scope2026-11-14
khalid.ns.cloudflare.comIn scope2026-11-14
khloe.ns.cloudflare.comIn scope2026-11-14
ki.ns.cloudflare.comIn scope2026-11-14
kia.ns.cloudflare.comIn scope2026-11-14
kianchau.ns.cloudflare.comIn scope2026-11-14
kiki.ns.cloudflare.comIn scope2026-11-14
ns3.kiki.ns.cloudflare.comIn scope2026-11-14
kim.ns.cloudflare.comIn scope2026-11-14
kimora.ns.cloudflare.comIn scope2026-11-14
kinsley.ns.cloudflare.comIn scope2026-11-14
kip.ns.cloudflare.comIn scope2026-11-14
autodiscover.dairystatecheese.com.kip.ns.cloudflare.commailIn scope2026-11-14
kipp.ns.cloudflare.comIn scope2026-11-14
kira.ns.cloudflare.comIn scope2026-11-14
kirk.ns.cloudflare.comIn scope2026-11-14
kkanye.ns.cloudflare.comIn scope2026-11-14
koa.ns.cloudflare.comIn scope2026-11-14
kobe.ns.cloudflare.comIn scope2026-11-14
kolton.ns.cloudflare.comIn scope2026-11-14
konnor.ns.cloudflare.comIn scope2026-11-14
kristin.ns.cloudflare.comIn scope2026-11-14
kristina.ns.cloudflare.comIn scope2026-11-14
kurt.ns.cloudflare.comIn scope2026-11-14
kyle.ns.cloudflare.comIn scope2026-11-14
kyree.ns.cloudflare.comIn scope2026-11-14
kyrie.ns.cloudflare.comIn scope2026-11-14
lady.ns.cloudflare.comIn scope2026-11-14
laila.ns.cloudflare.comIn scope2026-11-14
laine.ns.cloudflare.comIn scope2026-11-14
lakas.ns.cloudflare.comIn scope2026-11-14
lamar.ns.cloudflare.comIn scope2026-11-14
lana.ns.cloudflare.comIn scope2026-11-14
langston.ns.cloudflare.comIn scope2026-11-14
lara.ns.cloudflare.comIn scope2026-11-14
lars.ns.cloudflare.comIn scope2026-11-14
laua.ns.cloudflare.comIn scope2026-11-14
laura.ns.cloudflare.comIn scope2026-11-14
lauryn.ns.cloudflare.comIn scope2026-11-14
laylah.ns.cloudflare.comIn scope2026-11-14
lazy.ns.cloudflare.comIn scope2026-11-14
le.ns.cloudflare.comIn scope2026-11-14
leah.ns.cloudflare.comIn scope2026-11-14
root.leah.ns.cloudflare.comIn scope2026-11-14
leanna.ns.cloudflare.comIn scope2026-11-14
lee.ns.cloudflare.comIn scope2026-11-14
ns2.lee.ns.cloudflare.comIn scope2026-11-14
leia.ns.cloudflare.comIn scope2026-11-14
leif.ns.cloudflare.comIn scope2026-11-14
leland.ns.cloudflare.comIn scope2026-11-14
lennon.ns.cloudflare.comIn scope2026-11-14
lennox.ns.cloudflare.comIn scope2026-11-14
leo.ns.cloudflare.comIn scope2026-11-14
leonard.ns.cloudflare.comIn scope2026-11-14
leonidas.ns.cloudflare.comIn scope2026-11-14
lewis.ns.cloudflare.comIn scope2026-11-14
lex.ns.cloudflare.comIn scope2026-11-14
lia.ns.cloudflare.comIn scope2026-11-14
lian.ns.cloudflare.comIn scope2026-11-14
liberty.ns.cloudflare.comIn scope2026-11-14
ligia.ns.cloudflare.comIn scope2026-11-14
lila.ns.cloudflare.comIn scope2026-11-14
lilith.ns.cloudflare.comIn scope2026-11-14
lily.ns.cloudflare.comIn scope2026-11-14
lilyana.ns.cloudflare.comIn scope2026-11-14
lim.ns.cloudflare.comIn scope2026-11-14
lina.ns.cloudflare.comIn scope2026-11-14
linda.ns.cloudflare.comIn scope2026-11-14
lindsey.ns.cloudflare.comIn scope2026-11-14
lisa.ns.cloudflare.comIn scope2026-11-14
liv.ns.cloudflare.comIn scope2026-11-14
liz.ns.cloudflare.comIn scope2026-11-14
llaura.ns.cloudflare.comIn scope2026-11-14
lleah.ns.cloudflare.comIn scope2026-11-14
lloyd.ns.cloudflare.comIn scope2026-11-14
cpanel.texsani.com.lloyd.ns.cloudflare.comadminIn scope2026-11-14
webmail.texsani.com.lloyd.ns.cloudflare.commailIn scope2026-11-14
www.texsani.com.lloyd.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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