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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
lmo.ns.cloudflare.comIn scope2026-11-14
lo.ns.cloudflare.comIn scope2026-11-14
lochlan.ns.cloudflare.comIn scope2026-11-14
logan.ns.cloudflare.comIn scope2026-11-14
www.logan.ns.cloudflare.comIn scope2026-11-14
lol.ns.cloudflare.comIn scope2026-11-14
lola.ns.cloudflare.comIn scope2026-11-14
lorna.ns.cloudflare.comIn scope2026-11-14
lornasss.ns.cloudflare.comIn scope2026-11-14
lou.ns.cloudflare.comIn scope2026-11-14
louis.ns.cloudflare.comIn scope2026-11-14
love.ns.cloudflare.comIn scope2026-11-14
lovisa.ns.cloudflare.comIn scope2026-11-14
luciana.ns.cloudflare.comIn scope2026-11-14
luciane.ns.cloudflare.comIn scope2026-11-14
lucy.ns.cloudflare.comIn scope2026-11-14
luke.ns.cloudflare.comIn scope2026-11-14
lune.ns.cloudflare.comIn scope2026-11-14
lynn.ns.cloudflare.comIn scope2026-11-14
macc.ns.cloudflare.comIn scope2026-11-14
maciej.ns.cloudflare.comIn scope2026-11-14
mack.ns.cloudflare.comIn scope2026-11-14
macy.ns.cloudflare.comIn scope2026-11-14
maeve.ns.cloudflare.comIn scope2026-11-14
magali.ns.cloudflare.comIn scope2026-11-14
magdalena.ns.cloudflare.comIn scope2026-11-14
magnolia.ns.cloudflare.comIn scope2026-11-14
mail.ns.cloudflare.commailIn scope2026-11-14
maisie.ns.cloudflare.comIn scope2026-11-14
major.ns.cloudflare.comIn scope2026-11-14
malavika.ns.cloudflare.comIn scope2026-11-14
malcolm.ns.cloudflare.comIn scope2026-11-14
maleah.ns.cloudflare.comIn scope2026-11-14
mallory.ns.cloudflare.comIn scope2026-11-14
many.ns.cloudflare.comIn scope2026-11-14
marek.ns.cloudflare.comIn scope2026-11-14
margaret.ns.cloudflare.comIn scope2026-11-14
marge.ns.cloudflare.comIn scope2026-11-14
margo.ns.cloudflare.comIn scope2026-11-14
margot.ns.cloudflare.comIn scope2026-11-14
maria.ns.cloudflare.comIn scope2026-11-14
mariah.ns.cloudflare.comIn scope2026-11-14
mario.ns.cloudflare.comIn scope2026-11-14
marissa.ns.cloudflare.comIn scope2026-11-14
marjory.ns.cloudflare.comIn scope2026-11-14
mark.ns.cloudflare.comIn scope2026-11-14
marlin.ns.cloudflare.comIn scope2026-11-14
marlowe.ns.cloudflare.comIn scope2026-11-14
marly.ns.cloudflare.comIn scope2026-11-14
martha.ns.cloudflare.comIn scope2026-11-14
martin.ns.cloudflare.comIn scope2026-11-14
marty.ns.cloudflare.comIn scope2026-11-14
marvin.ns.cloudflare.comIn scope2026-11-14
mary.ns.cloudflare.comIn scope2026-11-14
mat.ns.cloudflare.comIn scope2026-11-14
math.ns.cloudflare.comIn scope2026-11-14
matian.ns.cloudflare.comIn scope2026-11-14
matias.ns.cloudflare.comIn scope2026-11-14
matt.ns.cloudflare.comIn scope2026-11-14
matteo.ns.cloudflare.comIn scope2026-11-14
max.ns.cloudflare.comIn scope2026-11-14
adrian.ns.max.ns.cloudflare.comIn scope2026-11-14
maxim.ns.cloudflare.comIn scope2026-11-14
maxine.ns.cloudflare.comIn scope2026-11-14
may.ns.cloudflare.comIn scope2026-11-14
maya.ns.cloudflare.comIn scope2026-11-14
postmaster.maya.ns.cloudflare.comIn scope2026-11-14
www.maya.ns.cloudflare.comIn scope2026-11-14
mayk.ns.cloudflare.comIn scope2026-11-14
mcgrory.ns.cloudflare.comIn scope2026-11-14
mckenzie.ns.cloudflare.comIn scope2026-11-14
mckinley.ns.cloudflare.comIn scope2026-11-14
meadow.ns.cloudflare.comIn scope2026-11-14
meera.ns.cloudflare.comIn scope2026-11-14
meg.ns.cloudflare.comIn scope2026-11-14
megan.ns.cloudflare.comIn scope2026-11-14
meilani.ns.cloudflare.comIn scope2026-11-14
meiling.ns.cloudflare.comIn scope2026-11-14
melany.ns.cloudflare.comIn scope2026-11-14
melina.ns.cloudflare.comIn scope2026-11-14
melinda.ns.cloudflare.comIn scope2026-11-14
melissa.ns.cloudflare.comIn scope2026-11-14
melnicoff.ns.cloudflare.comIn scope2026-11-14
melody.ns.cloudflare.comIn scope2026-11-14
memphis.ns.cloudflare.comIn scope2026-11-14
merek.ns.cloudflare.comIn scope2026-11-14
merlin.ns.cloudflare.comIn scope2026-11-14
mi.ns.cloudflare.comIn scope2026-11-14
mia.ns.cloudflare.comIn scope2026-11-14
mica.ns.cloudflare.comIn scope2026-11-14
micah.ns.cloudflare.comIn scope2026-11-14
michael.ns.cloudflare.comIn scope2026-11-14
michelle.ns.cloudflare.comIn scope2026-11-14
en.ns.michelle.ns.cloudflare.comIn scope2026-11-14
miguel.ns.cloudflare.comIn scope2026-11-14
mike.ns.cloudflare.comIn scope2026-11-14
miki.ns.cloudflare.comIn scope2026-11-14
milan.ns.cloudflare.comIn scope2026-11-14
miles.ns.cloudflare.comIn scope2026-11-14
millie.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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