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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
forums.cloudflareaccess.comNot in the scope2026-11-14
forwardlevel.cloudflareaccess.comNot in the scope2026-11-14
forwardx.cloudflareaccess.comNot in the scope2026-11-14
fouland.cloudflareaccess.comNot in the scope2026-11-14
foundeo.cloudflareaccess.comNot in the scope2026-11-14
foundmyfitness.cloudflareaccess.comNot in the scope2026-11-14
fournuts.cloudflareaccess.comNot in the scope2026-11-14
foxstudioweb.cloudflareaccess.comNot in the scope2026-11-14
fphi.cloudflareaccess.comNot in the scope2026-11-14
fragrance.cloudflareaccess.comNot in the scope2026-11-14
franeker.cloudflareaccess.comNot in the scope2026-11-14
franklincovey.cloudflareaccess.comNot in the scope2026-11-14
franklincoveycfsso.cloudflareaccess.comNot in the scope2026-11-14
franklincoveycom.cloudflareaccess.comNot in the scope2026-11-14
frankwatching.cloudflareaccess.comNot in the scope2026-11-14
fransat.cloudflareaccess.comNot in the scope2026-11-14
fraudpreventionsystems.cloudflareaccess.comNot in the scope2026-11-14
freddyheppell.cloudflareaccess.comNot in the scope2026-11-14
fredqm.cloudflareaccess.comNot in the scope2026-11-14
free.cloudflareaccess.comNot in the scope2026-11-14
free2mail.cloudflareaccess.commailNot in the scope2026-11-14
freec.cloudflareaccess.comNot in the scope2026-11-14
freedomofpress.cloudflareaccess.comNot in the scope2026-11-14
freemalaysiatoday.cloudflareaccess.comNot in the scope2026-11-14
freenet-group.cloudflareaccess.comNot in the scope2026-11-14
freevap.cloudflareaccess.comNot in the scope2026-11-14
frenwall.cloudflareaccess.comNot in the scope2026-11-14
freshwatersystems.cloudflareaccess.comNot in the scope2026-11-14
fricke.cloudflareaccess.comNot in the scope2026-11-14
fridleif.cloudflareaccess.comNot in the scope2026-11-14
friendlyvoid.cloudflareaccess.comNot in the scope2026-11-14
friendschurch.cloudflareaccess.comNot in the scope2026-11-14
friendsofphp.cloudflareaccess.comNot in the scope2026-11-14
frleo.cloudflareaccess.comNot in the scope2026-11-14
froekjaer.cloudflareaccess.comNot in the scope2026-11-14
frogcanhelpyou.cloudflareaccess.comNot in the scope2026-11-14
frontend-team.cloudflareaccess.comNot in the scope2026-11-14
frontkom.cloudflareaccess.comNot in the scope2026-11-14
frontmarketing.cloudflareaccess.comNot in the scope2026-11-14
frota.cloudflareaccess.comNot in the scope2026-11-14
fsjworldwide.cloudflareaccess.comNot in the scope2026-11-14
fsocietygr.cloudflareaccess.comNot in the scope2026-11-14
fsu.cloudflareaccess.comNot in the scope2026-11-14
ft.cloudflareaccess.comNot in the scope2026-11-14
fth.cloudflareaccess.comNot in the scope2026-11-14
fucik.cloudflareaccess.comNot in the scope2026-11-14
fuehome.cloudflareaccess.comNot in the scope2026-11-14
fuemtu.cloudflareaccess.comNot in the scope2026-11-14
fuerst.cloudflareaccess.comNot in the scope2026-11-14
fuiz.cloudflareaccess.comNot in the scope2026-11-14
fullfilmizletsem.cloudflareaccess.comNot in the scope2026-11-14
fully-inc.cloudflareaccess.comNot in the scope2026-11-14
fundingsocieties.cloudflareaccess.comNot in the scope2026-11-14
fundsmith.cloudflareaccess.comNot in the scope2026-11-14
fureynet.cloudflareaccess.comNot in the scope2026-11-14
furman.cloudflareaccess.comNot in the scope2026-11-14
furnishedfinder.cloudflareaccess.comNot in the scope2026-11-14
furshows.cloudflareaccess.comNot in the scope2026-11-14
furtherlearningacademy.cloudflareaccess.comNot in the scope2026-11-14
furtherlearninggroup.cloudflareaccess.comNot in the scope2026-11-14
fusionanalytics.cloudflareaccess.comNot in the scope2026-11-14
fusionspan.cloudflareaccess.comNot in the scope2026-11-14
fusurus.cloudflareaccess.comNot in the scope2026-11-14
futebolcard.cloudflareaccess.comNot in the scope2026-11-14
futurae.cloudflareaccess.comNot in the scope2026-11-14
futurebound.cloudflareaccess.comNot in the scope2026-11-14
futureweidta.cloudflareaccess.comNot in the scope2026-11-14
fw.cloudflareaccess.comNot in the scope2026-11-14
fxcorporate.cloudflareaccess.comNot in the scope2026-11-14
fym.cloudflareaccess.comNot in the scope2026-11-14
g2media.cloudflareaccess.comNot in the scope2026-11-14
ga.cloudflareaccess.comNot in the scope2026-11-14
gabcom.cloudflareaccess.comNot in the scope2026-11-14
gabites.cloudflareaccess.comNot in the scope2026-11-14
gac-rds-external-readonly.cloudflareaccess.comNot in the scope2026-11-14
gac-rds-external-readonly-preprod.cloudflareaccess.comstagingNot in the scope2026-11-14
gagarin.cloudflareaccess.comNot in the scope2026-11-14
galen.cloudflareaccess.comNot in the scope2026-11-14
galexia.cloudflareaccess.comNot in the scope2026-11-14
gameblog.cloudflareaccess.comNot in the scope2026-11-14
gameboost.cloudflareaccess.comNot in the scope2026-11-14
gamegymcz.cloudflareaccess.comNot in the scope2026-11-14
gameserverkings.cloudflareaccess.comNot in the scope2026-11-14
gaming-provider.cloudflareaccess.comNot in the scope2026-11-14
gangscope.cloudflareaccess.comNot in the scope2026-11-14
gangwolf.cloudflareaccess.comNot in the scope2026-11-14
ganttpro.cloudflareaccess.comNot in the scope2026-11-14
garanthomas.cloudflareaccess.comNot in the scope2026-11-14
garryhost.cloudflareaccess.comNot in the scope2026-11-14
gase7.cloudflareaccess.comNot in the scope2026-11-14
gatego.cloudflareaccess.comNot in the scope2026-11-14
gatemaster.cloudflareaccess.comNot in the scope2026-11-14
gatewayaccess.cloudflareaccess.comNot in the scope2026-11-14
gatewayblend.cloudflareaccess.comNot in the scope2026-11-14
gatewayy.cloudflareaccess.comNot in the scope2026-11-14
gatsoft.cloudflareaccess.comNot in the scope2026-11-14
gavzey.cloudflareaccess.comNot in the scope2026-11-14
gbostoen.cloudflareaccess.comNot in the scope2026-11-14
gc0d3.cloudflareaccess.comNot in the scope2026-11-14
gccgovsg.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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