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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
calibratelab.cloudflareaccess.comNot in the scope2026-11-14
calm-unit-5235.cloudflareaccess.comNot in the scope2026-11-14
calotte.cloudflareaccess.comNot in the scope2026-11-14
camboim.cloudflareaccess.comNot in the scope2026-11-14
cambridgeaudio.cloudflareaccess.comNot in the scope2026-11-14
cambridgecloudflare.cloudflareaccess.comNot in the scope2026-11-14
camfilab.cloudflareaccess.comNot in the scope2026-11-14
canadia.cloudflareaccess.comNot in the scope2026-11-14
candidco.cloudflareaccess.comNot in the scope2026-11-14
cangesc.cloudflareaccess.comNot in the scope2026-11-14
canva.cloudflareaccess.comNot in the scope2026-11-14
canva-ds.cloudflareaccess.comNot in the scope2026-11-14
canva-sites.cloudflareaccess.comNot in the scope2026-11-14
cap-collectif.cloudflareaccess.comNot in the scope2026-11-14
carebit.cloudflareaccess.comNot in the scope2026-11-14
careers.cloudflareaccess.comNot in the scope2026-11-14
carhelper.cloudflareaccess.comNot in the scope2026-11-14
carmelosantana.cloudflareaccess.comNot in the scope2026-11-14
carnaval.cloudflareaccess.comNot in the scope2026-11-14
carousellgroup.cloudflareaccess.comNot in the scope2026-11-14
carrierglobal.cloudflareaccess.comNot in the scope2026-11-14
carrierglobal1.cloudflareaccess.comNot in the scope2026-11-14
cars24.cloudflareaccess.comNot in the scope2026-11-14
carsandbids.cloudflareaccess.comNot in the scope2026-11-14
carsireland.cloudflareaccess.comNot in the scope2026-11-14
carta.cloudflareaccess.comNot in the scope2026-11-14
casinobud.cloudflareaccess.comNot in the scope2026-11-14
casinocountdown.cloudflareaccess.comNot in the scope2026-11-14
casita-lacher.cloudflareaccess.comNot in the scope2026-11-14
casper.cloudflareaccess.comNot in the scope2026-11-14
caspix.cloudflareaccess.comNot in the scope2026-11-14
catena.cloudflareaccess.comNot in the scope2026-11-14
catena-02.cloudflareaccess.comNot in the scope2026-11-14
catena-05.cloudflareaccess.comNot in the scope2026-11-14
catena-latam.cloudflareaccess.comNot in the scope2026-11-14
causton.cloudflareaccess.comNot in the scope2026-11-14
cazoo.cloudflareaccess.comNot in the scope2026-11-14
cb.cloudflareaccess.comNot in the scope2026-11-14
cbca-staging.cloudflareaccess.comstagingNot in the scope2026-11-14
cbfwhitelist.cloudflareaccess.comNot in the scope2026-11-14
cbre.cloudflareaccess.comNot in the scope2026-11-14
cc-staging.cloudflareaccess.comstagingNot in the scope2026-11-14
ccap.cloudflareaccess.comNot in the scope2026-11-14
ccf.cloudflareaccess.comNot in the scope2026-11-14
ccmupdate.cloudflareaccess.comNot in the scope2026-11-14
cco.cloudflareaccess.comNot in the scope2026-11-14
ccollart.cloudflareaccess.comNot in the scope2026-11-14
cdgo.cloudflareaccess.comNot in the scope2026-11-14
cdmauscrm.cloudflareaccess.comNot in the scope2026-11-14
cdmukcrm.cloudflareaccess.comNot in the scope2026-11-14
cdn.cloudflareaccess.comNot in the scope2026-11-14
cdq-api.cloudflareaccess.comapiNot in the scope2026-11-14
cdr-link.cloudflareaccess.comNot in the scope2026-11-14
ce.cloudflareaccess.comNot in the scope2026-11-14
cebrian.cloudflareaccess.comNot in the scope2026-11-14
cede.cloudflareaccess.comNot in the scope2026-11-14
cedrainteractive.cloudflareaccess.comNot in the scope2026-11-14
cellsignalcfsso.cloudflareaccess.comNot in the scope2026-11-14
cellulantco.cloudflareaccess.comNot in the scope2026-11-14
centminmod.cloudflareaccess.comNot in the scope2026-11-14
centr-treninga.cloudflareaccess.comNot in the scope2026-11-14
centralwebsites.cloudflareaccess.comNot in the scope2026-11-14
centro-de-excelencia.cloudflareaccess.comNot in the scope2026-11-14
century.cloudflareaccess.comNot in the scope2026-11-14
cerberusdev.cloudflareaccess.comNot in the scope2026-11-14
cerebralstudio.cloudflareaccess.comNot in the scope2026-11-14
cerebre.cloudflareaccess.comNot in the scope2026-11-14
ceredigion.cloudflareaccess.comNot in the scope2026-11-14
cert.cloudflareaccess.comNot in the scope2026-11-14
certificate.cloudflareaccess.comNot in the scope2026-11-14
certinia.cloudflareaccess.comNot in the scope2026-11-14
cetremper.cloudflareaccess.comNot in the scope2026-11-14
cf-atlassian.cloudflareaccess.comNot in the scope2026-11-14
cf-authentication.cloudflareaccess.comNot in the scope2026-11-14
cf-eth.cloudflareaccess.comNot in the scope2026-11-14
cf1-zerotrust-wordpress.cloudflareaccess.comNot in the scope2026-11-14
cfdata.cloudflareaccess.comNot in the scope2026-11-14
cfone.cloudflareaccess.comNot in the scope2026-11-14
cfpboard.cloudflareaccess.comNot in the scope2026-11-14
cfsecure.cloudflareaccess.comNot in the scope2026-11-14
cfwho.cloudflareaccess.comNot in the scope2026-11-14
chabad.cloudflareaccess.comNot in the scope2026-11-14
chainchallenger.cloudflareaccess.comNot in the scope2026-11-14
chaleto.cloudflareaccess.comNot in the scope2026-11-14
challis.cloudflareaccess.comNot in the scope2026-11-14
chalmerssolarteam.cloudflareaccess.comNot in the scope2026-11-14
championk.cloudflareaccess.comNot in the scope2026-11-14
character.cloudflareaccess.comNot in the scope2026-11-14
charitydana.cloudflareaccess.comNot in the scope2026-11-14
charoenaart.cloudflareaccess.comNot in the scope2026-11-14
charteredaccountantsanz.cloudflareaccess.comNot in the scope2026-11-14
chasnews.cloudflareaccess.comNot in the scope2026-11-14
chatlio.cloudflareaccess.comNot in the scope2026-11-14
chb.cloudflareaccess.comNot in the scope2026-11-14
check.cloudflareaccess.comNot in the scope2026-11-14
checkjelinkje.cloudflareaccess.comNot in the scope2026-11-14
checkpoint.cloudflareaccess.comNot in the scope2026-11-14
cheetah.cloudflareaccess.comNot in the scope2026-11-14
cherokee.cloudflareaccess.comNot in the scope2026-11-14
ches.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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