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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
chesscom.cloudflareaccess.comNot in the scope2026-11-14
chew.cloudflareaccess.comNot in the scope2026-11-14
chilango.cloudflareaccess.comNot in the scope2026-11-14
chillisign.cloudflareaccess.comNot in the scope2026-11-14
chillmill.cloudflareaccess.comNot in the scope2026-11-14
chino-cafe.cloudflareaccess.comNot in the scope2026-11-14
chiprentals.cloudflareaccess.comNot in the scope2026-11-14
chips.cloudflareaccess.comNot in the scope2026-11-14
chipserver.cloudflareaccess.comNot in the scope2026-11-14
chiuhome.cloudflareaccess.comNot in the scope2026-11-14
chocobrain.cloudflareaccess.comNot in the scope2026-11-14
choiceerp.cloudflareaccess.comNot in the scope2026-11-14
choicevotingco.cloudflareaccess.comNot in the scope2026-11-14
choistats.cloudflareaccess.comNot in the scope2026-11-14
chook.cloudflareaccess.comNot in the scope2026-11-14
chozenco.cloudflareaccess.comNot in the scope2026-11-14
chq.cloudflareaccess.comNot in the scope2026-11-14
chris994.cloudflareaccess.comNot in the scope2026-11-14
chrisdhal.cloudflareaccess.comNot in the scope2026-11-14
chrobinsoncfsso.cloudflareaccess.comNot in the scope2026-11-14
chronobank-auth.cloudflareaccess.comauthNot in the scope2026-11-14
chrstg.cloudflareaccess.comNot in the scope2026-11-14
chuchutrains.cloudflareaccess.comNot in the scope2026-11-14
chunkeat.cloudflareaccess.comNot in the scope2026-11-14
churchstudio.cloudflareaccess.comNot in the scope2026-11-14
cibercuba.cloudflareaccess.comNot in the scope2026-11-14
cicku.cloudflareaccess.comNot in the scope2026-11-14
cim-api.cloudflareaccess.comapiNot in the scope2026-11-14
cim-api-dev.cloudflareaccess.comapi, devNot in the scope2026-11-14
cim-api-qa.cloudflareaccess.comapi, testNot in the scope2026-11-14
cim-api-uat.cloudflareaccess.comapi, testNot in the scope2026-11-14
cim-data-quality-qa.cloudflareaccess.comtestNot in the scope2026-11-14
cim-dev.cloudflareaccess.comdevNot in the scope2026-11-14
cim-geo-dev.cloudflareaccess.comdevNot in the scope2026-11-14
cinesa.cloudflareaccess.comNot in the scope2026-11-14
circalighting.cloudflareaccess.comNot in the scope2026-11-14
circuloplusph.cloudflareaccess.comNot in the scope2026-11-14
cirruscreative.cloudflareaccess.comNot in the scope2026-11-14
citpro.cloudflareaccess.comNot in the scope2026-11-14
citrix.cloudflareaccess.comvpnNot in the scope2026-11-14
citrus.cloudflareaccess.comNot in the scope2026-11-14
cityoflasvegas.cloudflareaccess.comNot in the scope2026-11-14
civi.cloudflareaccess.comNot in the scope2026-11-14
cjcircle.cloudflareaccess.comNot in the scope2026-11-14
cjones.cloudflareaccess.comNot in the scope2026-11-14
cjponyparts.cloudflareaccess.comNot in the scope2026-11-14
cjscdkeys.cloudflareaccess.comNot in the scope2026-11-14
ck.cloudflareaccess.comNot in the scope2026-11-14
clarkflix.cloudflareaccess.comNot in the scope2026-11-14
classer.cloudflareaccess.comNot in the scope2026-11-14
classmethod.cloudflareaccess.comNot in the scope2026-11-14
classy.cloudflareaccess.comNot in the scope2026-11-14
cldaccwebcraft.cloudflareaccess.comNot in the scope2026-11-14
clean-cooling.cloudflareaccess.comNot in the scope2026-11-14
cleanrider.cloudflareaccess.comNot in the scope2026-11-14
clearlydev.cloudflareaccess.comNot in the scope2026-11-14
clearlyip.cloudflareaccess.comNot in the scope2026-11-14
clematc.cloudflareaccess.comNot in the scope2026-11-14
clevertap.cloudflareaccess.comNot in the scope2026-11-14
click.cloudflareaccess.comNot in the scope2026-11-14
click2mail.cloudflareaccess.commailNot in the scope2026-11-14
clients.cloudflareaccess.comNot in the scope2026-11-14
clinicaltrialmedia.cloudflareaccess.comNot in the scope2026-11-14
cloaked.cloudflareaccess.comNot in the scope2026-11-14
cloud.cloudflareaccess.comNot in the scope2026-11-14
cloud-underground.cloudflareaccess.comNot in the scope2026-11-14
cloudandculture.cloudflareaccess.comNot in the scope2026-11-14
cloudauth.cloudflareaccess.comNot in the scope2026-11-14
cloudengineering.cloudflareaccess.comNot in the scope2026-11-14
cloudflare-security.cloudflareaccess.comNot in the scope2026-11-14
cloudflareapitest.cloudflareaccess.comNot in the scope2026-11-14
cloudflareauth.cloudflareaccess.comNot in the scope2026-11-14
cloudflared7.cloudflareaccess.comNot in the scope2026-11-14
cloudflaremelaleuca.cloudflareaccess.comNot in the scope2026-11-14
cloudflaretv.cloudflareaccess.comNot in the scope2026-11-14
cloudico.cloudflareaccess.comNot in the scope2026-11-14
cloudjiasu.cloudflareaccess.comNot in the scope2026-11-14
cloudlaw.cloudflareaccess.comNot in the scope2026-11-14
cloudnative-love.cloudflareaccess.comNot in the scope2026-11-14
cloudsecure.cloudflareaccess.comNot in the scope2026-11-14
clovyr.cloudflareaccess.comNot in the scope2026-11-14
clubcar.cloudflareaccess.comNot in the scope2026-11-14
clubpremier.cloudflareaccess.comNot in the scope2026-11-14
cluster.cloudflareaccess.comNot in the scope2026-11-14
cms-iqos.cloudflareaccess.comadminNot in the scope2026-11-14
cms-test.cloudflareaccess.comadmin, testNot in the scope2026-11-14
cname.cloudflareaccess.comNot in the scope2026-11-14
cncorp.cloudflareaccess.comNot in the scope2026-11-14
cnilocates.cloudflareaccess.comNot in the scope2026-11-14
coalition.cloudflareaccess.comNot in the scope2026-11-14
coastentertainment.cloudflareaccess.comNot in the scope2026-11-14
coc.cloudflareaccess.comNot in the scope2026-11-14
cocotweaks.cloudflareaccess.comNot in the scope2026-11-14
codaelectronics.cloudflareaccess.comNot in the scope2026-11-14
code.cloudflareaccess.comNot in the scope2026-11-14
codeblock.cloudflareaccess.comNot in the scope2026-11-14
codebucket-sso.cloudflareaccess.comauthNot in the scope2026-11-14
codedamn.cloudflareaccess.comNot in the scope2026-11-14
codeshop.cloudflareaccess.comNot in the scope2026-11-14
codestage1201.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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