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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
al-ain.cloudflareaccess.comNot in the scope2026-11-14
alaa-be.cloudflareaccess.comNot in the scope2026-11-14
alavoine.cloudflareaccess.comNot in the scope2026-11-14
albemarle.cloudflareaccess.comNot in the scope2026-11-14
albertomarziali.cloudflareaccess.comNot in the scope2026-11-14
alcoholchange.cloudflareaccess.comNot in the scope2026-11-14
aldf.cloudflareaccess.comNot in the scope2026-11-14
aldrichhousehold.cloudflareaccess.comNot in the scope2026-11-14
alexcj96.cloudflareaccess.comNot in the scope2026-11-14
alexholland.cloudflareaccess.comNot in the scope2026-11-14
alexkri.cloudflareaccess.comNot in the scope2026-11-14
algoliacfsso.cloudflareaccess.comNot in the scope2026-11-14
alighato.cloudflareaccess.comNot in the scope2026-11-14
alkemi.cloudflareaccess.comNot in the scope2026-11-14
all3dp.cloudflareaccess.comNot in the scope2026-11-14
allanswers.cloudflareaccess.comNot in the scope2026-11-14
alliesgroup.cloudflareaccess.comNot in the scope2026-11-14
alloparadise.cloudflareaccess.comNot in the scope2026-11-14
alltet.cloudflareaccess.comNot in the scope2026-11-14
alltips.cloudflareaccess.comNot in the scope2026-11-14
alluradirect.cloudflareaccess.comNot in the scope2026-11-14
almagd.cloudflareaccess.comNot in the scope2026-11-14
almajal.cloudflareaccess.comNot in the scope2026-11-14
almarq.cloudflareaccess.comNot in the scope2026-11-14
almstqbl.cloudflareaccess.comNot in the scope2026-11-14
aloeride.cloudflareaccess.comNot in the scope2026-11-14
alonefield.cloudflareaccess.comNot in the scope2026-11-14
alonsobustamante.cloudflareaccess.comNot in the scope2026-11-14
alpha.cloudflareaccess.comstagingNot in the scope2026-11-14
alphacid.cloudflareaccess.comNot in the scope2026-11-14
alphait.cloudflareaccess.comNot in the scope2026-11-14
alphazeta.cloudflareaccess.comNot in the scope2026-11-14
alsturf.cloudflareaccess.comNot in the scope2026-11-14
alt-f4-team.cloudflareaccess.comNot in the scope2026-11-14
altacg.cloudflareaccess.comNot in the scope2026-11-14
altairserver.cloudflareaccess.comNot in the scope2026-11-14
altayer.cloudflareaccess.comNot in the scope2026-11-14
altmetric.cloudflareaccess.comNot in the scope2026-11-14
alvintai.cloudflareaccess.comNot in the scope2026-11-14
amaadershomoy.cloudflareaccess.comNot in the scope2026-11-14
amalance.cloudflareaccess.comNot in the scope2026-11-14
amanzi.cloudflareaccess.comNot in the scope2026-11-14
amarsinghjee.cloudflareaccess.comNot in the scope2026-11-14
amatezu.cloudflareaccess.comNot in the scope2026-11-14
amay.cloudflareaccess.comNot in the scope2026-11-14
amazsims.cloudflareaccess.comNot in the scope2026-11-14
ambagtsheer.cloudflareaccess.comNot in the scope2026-11-14
ambassador.cloudflareaccess.comNot in the scope2026-11-14
ambiel.cloudflareaccess.comNot in the scope2026-11-14
ambientiacfsso.cloudflareaccess.comNot in the scope2026-11-14
amcnetworksse.cloudflareaccess.comNot in the scope2026-11-14
amelco2.cloudflareaccess.comNot in the scope2026-11-14
amenitylab.cloudflareaccess.comNot in the scope2026-11-14
amightygirl.cloudflareaccess.comNot in the scope2026-11-14
amino.cloudflareaccess.comNot in the scope2026-11-14
aml-pk.cloudflareaccess.comNot in the scope2026-11-14
ammarcloudflare.cloudflareaccess.comNot in the scope2026-11-14
amobee.cloudflareaccess.comNot in the scope2026-11-14
amobeecfsso.cloudflareaccess.comNot in the scope2026-11-14
amplify-link.cloudflareaccess.comNot in the scope2026-11-14
amplisec.cloudflareaccess.comNot in the scope2026-11-14
ampmlabs.cloudflareaccess.comNot in the scope2026-11-14
ampsw.cloudflareaccess.comNot in the scope2026-11-14
amybanker.cloudflareaccess.comNot in the scope2026-11-14
andreigec.cloudflareaccess.comNot in the scope2026-11-14
andreistroescuweb.cloudflareaccess.comNot in the scope2026-11-14
andresaraujo.cloudflareaccess.comNot in the scope2026-11-14
andrewnet.cloudflareaccess.comNot in the scope2026-11-14
andrewskylabs.cloudflareaccess.comNot in the scope2026-11-14
angela-bruderer.cloudflareaccess.comNot in the scope2026-11-14
angelinv.cloudflareaccess.comNot in the scope2026-11-14
anisanews.cloudflareaccess.comNot in the scope2026-11-14
annapota.cloudflareaccess.comNot in the scope2026-11-14
anon-dot-com.cloudflareaccess.comNot in the scope2026-11-14
anot.cloudflareaccess.comNot in the scope2026-11-14
antalpha.cloudflareaccess.comNot in the scope2026-11-14
anthonymills.cloudflareaccess.comNot in the scope2026-11-14
antiraid.cloudflareaccess.comNot in the scope2026-11-14
anvi16.cloudflareaccess.comNot in the scope2026-11-14
anycoindirect.cloudflareaccess.comNot in the scope2026-11-14
anyline.cloudflareaccess.comNot in the scope2026-11-14
anziif.cloudflareaccess.comNot in the scope2026-11-14
ao.cloudflareaccess.comNot in the scope2026-11-14
aorn.cloudflareaccess.comNot in the scope2026-11-14
apacta.cloudflareaccess.comNot in the scope2026-11-14
apeman.cloudflareaccess.comNot in the scope2026-11-14
apexhosting.cloudflareaccess.comNot in the scope2026-11-14
aphx.cloudflareaccess.comNot in the scope2026-11-14
api.cloudflareaccess.comapiNot in the scope2026-11-14
apiatompurevpn.cloudflareaccess.comNot in the scope2026-11-14
apkfuel.cloudflareaccess.comNot in the scope2026-11-14
apne.cloudflareaccess.comNot in the scope2026-11-14
apollosuite.cloudflareaccess.comNot in the scope2026-11-14
apolotest.cloudflareaccess.comNot in the scope2026-11-14
apostahub.cloudflareaccess.comNot in the scope2026-11-14
app.cloudflareaccess.comNot in the scope2026-11-14
appbiotic.cloudflareaccess.comNot in the scope2026-11-14
appbox.cloudflareaccess.comNot in the scope2026-11-14
applieddigitalmedia.cloudflareaccess.comNot in the scope2026-11-14
appointmentguru.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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