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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:cloudflareaccess.com
Scope
Name suggests
First seen
Text fileClear filters4,882 names
Subdomains of Cloudflare Public Bug Bounty
NameScopeFirst seen
mailsdotso.cloudflareaccess.comNot in the scope2026-11-14
mailserver.cloudflareaccess.comNot in the scope2026-11-14
mailtrap.cloudflareaccess.comNot in the scope2026-11-14
maismei.cloudflareaccess.comNot in the scope2026-11-14
majarra.cloudflareaccess.comNot in the scope2026-11-14
makassb.cloudflareaccess.comNot in the scope2026-11-14
makeknown.cloudflareaccess.comNot in the scope2026-11-14
makerflare.cloudflareaccess.comNot in the scope2026-11-14
maleisiyin.cloudflareaccess.comNot in the scope2026-11-14
malinko.cloudflareaccess.comNot in the scope2026-11-14
malinovka.cloudflareaccess.comNot in the scope2026-11-14
malinowscy.cloudflareaccess.comNot in the scope2026-11-14
maljaars.cloudflareaccess.comNot in the scope2026-11-14
malt.cloudflareaccess.comNot in the scope2026-11-14
malwation.cloudflareaccess.comNot in the scope2026-11-14
mamanchien.cloudflareaccess.comNot in the scope2026-11-14
manafa.cloudflareaccess.comNot in the scope2026-11-14
manageaccount.cloudflareaccess.comNot in the scope2026-11-14
manomano.cloudflareaccess.comNot in the scope2026-11-14
manpow.cloudflareaccess.comNot in the scope2026-11-14
manth.cloudflareaccess.comNot in the scope2026-11-14
mantra-finance.cloudflareaccess.comNot in the scope2026-11-14
mapiful.cloudflareaccess.comNot in the scope2026-11-14
maplestest.cloudflareaccess.comNot in the scope2026-11-14
mapoll.cloudflareaccess.comNot in the scope2026-11-14
marahar.cloudflareaccess.comNot in the scope2026-11-14
marantalicom.cloudflareaccess.comNot in the scope2026-11-14
marchofdimes.cloudflareaccess.comNot in the scope2026-11-14
marco-selenati.cloudflareaccess.comNot in the scope2026-11-14
marcoaceti.cloudflareaccess.comNot in the scope2026-11-14
marfalkov.cloudflareaccess.comNot in the scope2026-11-14
mariadb.cloudflareaccess.comNot in the scope2026-11-14
marina-7vj-pages.cloudflareaccess.comNot in the scope2026-11-14
marist.cloudflareaccess.comNot in the scope2026-11-14
marketing-softys.cloudflareaccess.comNot in the scope2026-11-14
marketmind.cloudflareaccess.comNot in the scope2026-11-14
marketzoo.cloudflareaccess.comNot in the scope2026-11-14
marlin.cloudflareaccess.comNot in the scope2026-11-14
mars4-dev.cloudflareaccess.comdevNot in the scope2026-11-14
marsdenz.cloudflareaccess.comNot in the scope2026-11-14
martyn-testcom.cloudflareaccess.comNot in the scope2026-11-14
mashcape.cloudflareaccess.comNot in the scope2026-11-14
mashov.cloudflareaccess.comNot in the scope2026-11-14
massagetherapybc.cloudflareaccess.comNot in the scope2026-11-14
massaudubon.cloudflareaccess.comNot in the scope2026-11-14
massteam.cloudflareaccess.comNot in the scope2026-11-14
masterclass.cloudflareaccess.comNot in the scope2026-11-14
masterlife.cloudflareaccess.comNot in the scope2026-11-14
masterlifedev.cloudflareaccess.comNot in the scope2026-11-14
mastermedia.cloudflareaccess.comNot in the scope2026-11-14
masukkampus.cloudflareaccess.comNot in the scope2026-11-14
matchmaker.cloudflareaccess.comNot in the scope2026-11-14
mathieu-company.cloudflareaccess.comNot in the scope2026-11-14
matrix-exit.cloudflareaccess.comNot in the scope2026-11-14
matrixhomelab.cloudflareaccess.comNot in the scope2026-11-14
matrixpython.cloudflareaccess.comNot in the scope2026-11-14
matsci.cloudflareaccess.comNot in the scope2026-11-14
matthupy.cloudflareaccess.comNot in the scope2026-11-14
mattshomeserver.cloudflareaccess.comNot in the scope2026-11-14
mattsum.cloudflareaccess.comNot in the scope2026-11-14
mauth.cloudflareaccess.comNot in the scope2026-11-14
mavenagi.cloudflareaccess.comNot in the scope2026-11-14
mavyxsex.cloudflareaccess.comNot in the scope2026-11-14
maxartai.cloudflareaccess.comNot in the scope2026-11-14
maxautorental.cloudflareaccess.comNot in the scope2026-11-14
maxmind.cloudflareaccess.comNot in the scope2026-11-14
maxon.cloudflareaccess.comNot in the scope2026-11-14
mayday.cloudflareaccess.comNot in the scope2026-11-14
mayhsoe.cloudflareaccess.comNot in the scope2026-11-14
maysedergasse.cloudflareaccess.comNot in the scope2026-11-14
mc-market.cloudflareaccess.comNot in the scope2026-11-14
mcbar.cloudflareaccess.comNot in the scope2026-11-14
mcbcorgau.cloudflareaccess.comNot in the scope2026-11-14
mcbi-it-team.cloudflareaccess.comNot in the scope2026-11-14
mcconkie.cloudflareaccess.comNot in the scope2026-11-14
mcdclan.cloudflareaccess.comNot in the scope2026-11-14
mcdv.cloudflareaccess.comNot in the scope2026-11-14
mcgain.cloudflareaccess.comNot in the scope2026-11-14
mcjdmedia.cloudflareaccess.comNot in the scope2026-11-14
mclean.cloudflareaccess.comNot in the scope2026-11-14
mcr.cloudflareaccess.comNot in the scope2026-11-14
md13.cloudflareaccess.comNot in the scope2026-11-14
mda-malopolska.cloudflareaccess.comNot in the scope2026-11-14
mdec.cloudflareaccess.comNot in the scope2026-11-14
mdm.cloudflareaccess.comNot in the scope2026-11-14
mearman.cloudflareaccess.comNot in the scope2026-11-14
mebitek.cloudflareaccess.comNot in the scope2026-11-14
medal.cloudflareaccess.comNot in the scope2026-11-14
medbridge.cloudflareaccess.comNot in the scope2026-11-14
medelz.cloudflareaccess.comNot in the scope2026-11-14
medge.cloudflareaccess.comNot in the scope2026-11-14
media.cloudflareaccess.comNot in the scope2026-11-14
mediaanddance.cloudflareaccess.comNot in the scope2026-11-14
mediainteractiva.cloudflareaccess.comNot in the scope2026-11-14
mediapark.cloudflareaccess.comNot in the scope2026-11-14
mediaregisterinfo.cloudflareaccess.comNot in the scope2026-11-14
medienstuermer.cloudflareaccess.comNot in the scope2026-11-14
medium.cloudflareaccess.comNot in the scope2026-11-14
meduzacorp.cloudflareaccess.comNot in the scope2026-11-14
medxops.cloudflareaccess.comNot in the 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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