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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
csinit.cloudflareaccess.comNot in the scope2026-11-14
csl345.cloudflareaccess.comNot in the scope2026-11-14
csmoney-prd.cloudflareaccess.comNot in the scope2026-11-14
csskin.cloudflareaccess.comNot in the scope2026-11-14
csup.cloudflareaccess.comNot in the scope2026-11-14
ctfdklash.cloudflareaccess.comNot in the scope2026-11-14
ctin.cloudflareaccess.comNot in the scope2026-11-14
ctm-democom.cloudflareaccess.comNot in the scope2026-11-14
cubebot.cloudflareaccess.comNot in the scope2026-11-14
cudo.cloudflareaccess.comNot in the scope2026-11-14
cuelinks.cloudflareaccess.comNot in the scope2026-11-14
culka.cloudflareaccess.comNot in the scope2026-11-14
cultavix.cloudflareaccess.comNot in the scope2026-11-14
cummmins.cloudflareaccess.comNot in the scope2026-11-14
cumulusfire.cloudflareaccess.comNot in the scope2026-11-14
cup.cloudflareaccess.comNot in the scope2026-11-14
curebase.cloudflareaccess.comNot in the scope2026-11-14
curiousaddys.cloudflareaccess.comNot in the scope2026-11-14
current.cloudflareaccess.comNot in the scope2026-11-14
customeraccess.cloudflareaccess.comNot in the scope2026-11-14
cutler.cloudflareaccess.comNot in the scope2026-11-14
cv-ydgs-pages.cloudflareaccess.comNot in the scope2026-11-14
cvazquez3419.cloudflareaccess.comNot in the scope2026-11-14
cveapi.cloudflareaccess.comNot in the scope2026-11-14
cviteam.cloudflareaccess.comNot in the scope2026-11-14
cwang.cloudflareaccess.comNot in the scope2026-11-14
cws-wcs-website-pages.cloudflareaccess.comNot in the scope2026-11-14
cwtch.cloudflareaccess.comNot in the scope2026-11-14
cxperts.cloudflareaccess.comNot in the scope2026-11-14
cyahi.cloudflareaccess.comNot in the scope2026-11-14
cyanotech.cloudflareaccess.comNot in the scope2026-11-14
cyb3rx.cloudflareaccess.comNot in the scope2026-11-14
cyber-peacock.cloudflareaccess.comNot in the scope2026-11-14
cyberacademy.cloudflareaccess.comNot in the scope2026-11-14
cyberarx.cloudflareaccess.comNot in the scope2026-11-14
cyberbullies.cloudflareaccess.comNot in the scope2026-11-14
cybergamp.cloudflareaccess.comNot in the scope2026-11-14
cyberresponse.cloudflareaccess.comNot in the scope2026-11-14
cyndx.cloudflareaccess.comNot in the scope2026-11-14
cystack.cloudflareaccess.comNot in the scope2026-11-14
cytiva.cloudflareaccess.comNot in the scope2026-11-14
d3h.cloudflareaccess.comNot in the scope2026-11-14
d3mon01.cloudflareaccess.comNot in the scope2026-11-14
d66.cloudflareaccess.comNot in the scope2026-11-14
dabiran.cloudflareaccess.comNot in the scope2026-11-14
dabztudio.cloudflareaccess.comNot in the scope2026-11-14
daclogin.cloudflareaccess.comNot in the scope2026-11-14
dadangnh.cloudflareaccess.comNot in the scope2026-11-14
dadosense.cloudflareaccess.comNot in the scope2026-11-14
daikonlogic.cloudflareaccess.comNot in the scope2026-11-14
dailydiary.cloudflareaccess.comNot in the scope2026-11-14
dalanfriedman.cloudflareaccess.comNot in the scope2026-11-14
dale.cloudflareaccess.comNot in the scope2026-11-14
dallin.cloudflareaccess.comNot in the scope2026-11-14
damianmole.cloudflareaccess.comNot in the scope2026-11-14
damigate.cloudflareaccess.comNot in the scope2026-11-14
dancefeed.cloudflareaccess.comNot in the scope2026-11-14
dani.cloudflareaccess.comNot in the scope2026-11-14
danieapp.cloudflareaccess.comNot in the scope2026-11-14
danomano.cloudflareaccess.comNot in the scope2026-11-14
danslinky.cloudflareaccess.comNot in the scope2026-11-14
danspetssarasota.cloudflareaccess.comNot in the scope2026-11-14
danzar.cloudflareaccess.comNot in the scope2026-11-14
darcysandy.cloudflareaccess.comNot in the scope2026-11-14
darespider.cloudflareaccess.comNot in the scope2026-11-14
dargmuesli.cloudflareaccess.comNot in the scope2026-11-14
dariusdsilva.cloudflareaccess.comNot in the scope2026-11-14
darmasutha.cloudflareaccess.comNot in the scope2026-11-14
dartmoon.cloudflareaccess.comNot in the scope2026-11-14
dartmouth.cloudflareaccess.comNot in the scope2026-11-14
dashebuscar.cloudflareaccess.comNot in the scope2026-11-14
dashfold.cloudflareaccess.comNot in the scope2026-11-14
dashjoy.cloudflareaccess.comNot in the scope2026-11-14
dashlane.cloudflareaccess.comNot in the scope2026-11-14
dat-ag-rongbuk.cloudflareaccess.comNot in the scope2026-11-14
databricks.cloudflareaccess.comNot in the scope2026-11-14
datag.cloudflareaccess.comNot in the scope2026-11-14
datamotto.cloudflareaccess.comNot in the scope2026-11-14
dataneversleeps.cloudflareaccess.comNot in the scope2026-11-14
dataopengardenrch.cloudflareaccess.comNot in the scope2026-11-14
datapta.cloudflareaccess.comNot in the scope2026-11-14
datasitecfsso.cloudflareaccess.comNot in the scope2026-11-14
datatech-systems.cloudflareaccess.comNot in the scope2026-11-14
datavp.cloudflareaccess.comNot in the scope2026-11-14
dataweavers.cloudflareaccess.comNot in the scope2026-11-14
datawrapper.cloudflareaccess.comNot in the scope2026-11-14
dave.cloudflareaccess.comNot in the scope2026-11-14
daviesgroup.cloudflareaccess.comNot in the scope2026-11-14
davruna.cloudflareaccess.comNot in the scope2026-11-14
daweiyingshi.cloudflareaccess.comNot in the scope2026-11-14
dawel.cloudflareaccess.comNot in the scope2026-11-14
day1x.cloudflareaccess.comNot in the scope2026-11-14
daylightpiano.cloudflareaccess.comNot in the scope2026-11-14
db.cloudflareaccess.comdataNot in the scope2026-11-14
dbrand.cloudflareaccess.comNot in the scope2026-11-14
dbxsi.cloudflareaccess.comNot in the scope2026-11-14
dc.cloudflareaccess.comNot in the scope2026-11-14
dc87net.cloudflareaccess.comNot in the scope2026-11-14
dcabram.cloudflareaccess.comNot in the scope2026-11-14
dcbar.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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