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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
appsbd.cloudflareaccess.comNot in the scope2026-11-14
appsndisgov.cloudflareaccess.comNot in the scope2026-11-14
appstate.cloudflareaccess.comNot in the scope2026-11-14
apractice.cloudflareaccess.comNot in the scope2026-11-14
aptum.cloudflareaccess.comNot in the scope2026-11-14
aquest.cloudflareaccess.comNot in the scope2026-11-14
ar3s.cloudflareaccess.comNot in the scope2026-11-14
aratives.cloudflareaccess.comNot in the scope2026-11-14
archipelo.cloudflareaccess.comNot in the scope2026-11-14
archipro.cloudflareaccess.comNot in the scope2026-11-14
archwaycards.cloudflareaccess.comNot in the scope2026-11-14
arcrun.cloudflareaccess.comNot in the scope2026-11-14
area730.cloudflareaccess.comNot in the scope2026-11-14
arena-web-pages.cloudflareaccess.comNot in the scope2026-11-14
arenalayer.cloudflareaccess.comNot in the scope2026-11-14
aresmgmt.cloudflareaccess.comNot in the scope2026-11-14
argenova.cloudflareaccess.comNot in the scope2026-11-14
arimo.cloudflareaccess.comNot in the scope2026-11-14
arkton.cloudflareaccess.comNot in the scope2026-11-14
arkvatar.cloudflareaccess.comNot in the scope2026-11-14
armadilloone.cloudflareaccess.comNot in the scope2026-11-14
armoredmask.cloudflareaccess.comNot in the scope2026-11-14
armour.cloudflareaccess.comNot in the scope2026-11-14
armsinnovations.cloudflareaccess.comNot in the scope2026-11-14
arongroups.cloudflareaccess.comNot in the scope2026-11-14
aronica.cloudflareaccess.comNot in the scope2026-11-14
arrival.cloudflareaccess.comNot in the scope2026-11-14
arrowdesign.cloudflareaccess.comNot in the scope2026-11-14
arteriors.cloudflareaccess.comNot in the scope2026-11-14
artical.cloudflareaccess.comNot in the scope2026-11-14
artificialdimensions.cloudflareaccess.comNot in the scope2026-11-14
artlossregister.cloudflareaccess.comNot in the scope2026-11-14
artmoi.cloudflareaccess.comNot in the scope2026-11-14
artnet.cloudflareaccess.comNot in the scope2026-11-14
artnet-dev.cloudflareaccess.comdevNot in the scope2026-11-14
artstation.cloudflareaccess.comNot in the scope2026-11-14
arya57.cloudflareaccess.comNot in the scope2026-11-14
as-shofa.cloudflareaccess.comNot in the scope2026-11-14
asadzulfahri.cloudflareaccess.comNot in the scope2026-11-14
asagi.cloudflareaccess.comNot in the scope2026-11-14
ascap.cloudflareaccess.comNot in the scope2026-11-14
ascender.cloudflareaccess.comNot in the scope2026-11-14
asdfghjkl.cloudflareaccess.comNot in the scope2026-11-14
ashwinr.cloudflareaccess.comNot in the scope2026-11-14
asianpinay.cloudflareaccess.comNot in the scope2026-11-14
asiansfly.cloudflareaccess.comNot in the scope2026-11-14
ask-joe.cloudflareaccess.comNot in the scope2026-11-14
askit.cloudflareaccess.comNot in the scope2026-11-14
aslogin.cloudflareaccess.comNot in the scope2026-11-14
asodermark.cloudflareaccess.comNot in the scope2026-11-14
asolutionco.cloudflareaccess.comNot in the scope2026-11-14
aspshop.cloudflareaccess.comNot in the scope2026-11-14
assetadvantage.cloudflareaccess.comNot in the scope2026-11-14
assets.cloudflareaccess.comNot in the scope2026-11-14
astralalliance.cloudflareaccess.comNot in the scope2026-11-14
astro-server.cloudflareaccess.comNot in the scope2026-11-14
astryl.cloudflareaccess.comNot in the scope2026-11-14
asvla.cloudflareaccess.comNot in the scope2026-11-14
asxe.cloudflareaccess.comNot in the scope2026-11-14
aternos.cloudflareaccess.comNot in the scope2026-11-14
ath.cloudflareaccess.comNot in the scope2026-11-14
athenacom.cloudflareaccess.comNot in the scope2026-11-14
athensadmin.cloudflareaccess.comNot in the scope2026-11-14
athosnas.cloudflareaccess.comNot in the scope2026-11-14
atl-software.cloudflareaccess.comNot in the scope2026-11-14
atlanticx.cloudflareaccess.comNot in the scope2026-11-14
atmags.cloudflareaccess.comNot in the scope2026-11-14
atmospheregames.cloudflareaccess.comNot in the scope2026-11-14
atomlearning.cloudflareaccess.comNot in the scope2026-11-14
atotees.cloudflareaccess.comNot in the scope2026-11-14
atrumvesica.cloudflareaccess.comNot in the scope2026-11-14
attlas.cloudflareaccess.comNot in the scope2026-11-14
atto.cloudflareaccess.comNot in the scope2026-11-14
atumsystems.cloudflareaccess.comNot in the scope2026-11-14
aucoffre.cloudflareaccess.comNot in the scope2026-11-14
auctionaftersale.cloudflareaccess.comNot in the scope2026-11-14
auddeyhaki.cloudflareaccess.comNot in the scope2026-11-14
audioonline.cloudflareaccess.comNot in the scope2026-11-14
audiopeak.cloudflareaccess.comNot in the scope2026-11-14
auditorium.cloudflareaccess.comNot in the scope2026-11-14
auffligen.cloudflareaccess.comNot in the scope2026-11-14
aufinity.cloudflareaccess.comNot in the scope2026-11-14
augustclayton.cloudflareaccess.comNot in the scope2026-11-14
aurumdaum.cloudflareaccess.comNot in the scope2026-11-14
austincherry.cloudflareaccess.comNot in the scope2026-11-14
austinfam.cloudflareaccess.comNot in the scope2026-11-14
australianfrequentflyer.cloudflareaccess.comNot in the scope2026-11-14
auta42.cloudflareaccess.comNot in the scope2026-11-14
auth.cloudflareaccess.comauthNot in the scope2026-11-14
authapi.cloudflareaccess.comNot in the scope2026-11-14
authentication.cloudflareaccess.comNot in the scope2026-11-14
authlogin.cloudflareaccess.comNot in the scope2026-11-14
authme.cloudflareaccess.comNot in the scope2026-11-14
authorization.cloudflareaccess.comNot in the scope2026-11-14
authorize-ms.cloudflareaccess.comNot in the scope2026-11-14
authorizedpersonnel.cloudflareaccess.comNot in the scope2026-11-14
autoaha.cloudflareaccess.comNot in the scope2026-11-14
autoconfig.cloudflareaccess.comNot in the scope2026-11-14
autodiscover.cloudflareaccess.commailNot in the scope2026-11-14
automionz.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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