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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
grassrock.cloudflareaccess.comNot in the scope2026-11-14
grdiocese.cloudflareaccess.comNot in the scope2026-11-14
greatbody.cloudflareaccess.comNot in the scope2026-11-14
greatergood.cloudflareaccess.comNot in the scope2026-11-14
greenline.cloudflareaccess.comNot in the scope2026-11-14
greenmini.cloudflareaccess.comNot in the scope2026-11-14
greenstandards.cloudflareaccess.comNot in the scope2026-11-14
greenzero.cloudflareaccess.comNot in the scope2026-11-14
greetingsisland.cloudflareaccess.comNot in the scope2026-11-14
gregbrimble.cloudflareaccess.comNot in the scope2026-11-14
greydev.cloudflareaccess.comNot in the scope2026-11-14
greyphin.cloudflareaccess.comNot in the scope2026-11-14
grmdigital.cloudflareaccess.comNot in the scope2026-11-14
group360.cloudflareaccess.comNot in the scope2026-11-14
grupocloudspace.cloudflareaccess.comNot in the scope2026-11-14
grupoeon.cloudflareaccess.comNot in the scope2026-11-14
grupogigante.cloudflareaccess.comNot in the scope2026-11-14
gruposdemoda.cloudflareaccess.comNot in the scope2026-11-14
gruppoflorence.cloudflareaccess.comNot in the scope2026-11-14
gsoft.cloudflareaccess.comNot in the scope2026-11-14
gsp.cloudflareaccess.comNot in the scope2026-11-14
gtc-admin.cloudflareaccess.comadminNot in the scope2026-11-14
gtt-wp.cloudflareaccess.comNot in the scope2026-11-14
guardius.cloudflareaccess.comNot in the scope2026-11-14
gui.cloudflareaccess.comNot in the scope2026-11-14
guitartricks.cloudflareaccess.comNot in the scope2026-11-14
gulbsoft.cloudflareaccess.comNot in the scope2026-11-14
gundamserver.cloudflareaccess.comNot in the scope2026-11-14
guneysu.cloudflareaccess.comNot in the scope2026-11-14
guntranhoet.cloudflareaccess.comNot in the scope2026-11-14
gus.cloudflareaccess.comNot in the scope2026-11-14
guytu.cloudflareaccess.comNot in the scope2026-11-14
gvm5.cloudflareaccess.comNot in the scope2026-11-14
gvrenting.cloudflareaccess.comNot in the scope2026-11-14
gw.cloudflareaccess.comNot in the scope2026-11-14
gw-house.cloudflareaccess.comNot in the scope2026-11-14
gwplc-content.cloudflareaccess.comNot in the scope2026-11-14
gwplc-ecom.cloudflareaccess.comNot in the scope2026-11-14
gws.cloudflareaccess.comNot in the scope2026-11-14
gws-api-sandbox.cloudflareaccess.comapi, testNot in the scope2026-11-14
gws-dev.cloudflareaccess.comdevNot in the scope2026-11-14
gws-qa.cloudflareaccess.comtestNot in the scope2026-11-14
gws-rds-external-readonly-uat.cloudflareaccess.comtestNot in the scope2026-11-14
gws-uat.cloudflareaccess.comtestNot in the scope2026-11-14
gz8720.cloudflareaccess.comNot in the scope2026-11-14
h.cloudflareaccess.comNot in the scope2026-11-14
h4g.cloudflareaccess.comNot in the scope2026-11-14
habbix.cloudflareaccess.comNot in the scope2026-11-14
hackademic.cloudflareaccess.comNot in the scope2026-11-14
hacken.cloudflareaccess.comNot in the scope2026-11-14
hackershub.cloudflareaccess.comNot in the scope2026-11-14
hackforever.cloudflareaccess.comNot in the scope2026-11-14
hackthebox.cloudflareaccess.comNot in the scope2026-11-14
hackthehill.cloudflareaccess.comNot in the scope2026-11-14
hadamservices.cloudflareaccess.comNot in the scope2026-11-14
halanazi.cloudflareaccess.comNot in the scope2026-11-14
halhadus.cloudflareaccess.comNot in the scope2026-11-14
hallgren.cloudflareaccess.comNot in the scope2026-11-14
hamid.cloudflareaccess.comNot in the scope2026-11-14
hammermedia.cloudflareaccess.comNot in the scope2026-11-14
hamsterbyte.cloudflareaccess.comNot in the scope2026-11-14
hanabi-group.cloudflareaccess.comNot in the scope2026-11-14
hangikredi.cloudflareaccess.comNot in the scope2026-11-14
haocomcloud.cloudflareaccess.comNot in the scope2026-11-14
happn.cloudflareaccess.comNot in the scope2026-11-14
happycog.cloudflareaccess.comNot in the scope2026-11-14
happyshops.cloudflareaccess.comNot in the scope2026-11-14
harbortrade.cloudflareaccess.comNot in the scope2026-11-14
hardrock.cloudflareaccess.comNot in the scope2026-11-14
hargray.cloudflareaccess.comNot in the scope2026-11-14
harianaceh.cloudflareaccess.comNot in the scope2026-11-14
harisenin.cloudflareaccess.comNot in the scope2026-11-14
harley-davidson.cloudflareaccess.comNot in the scope2026-11-14
harshadineth.cloudflareaccess.comNot in the scope2026-11-14
hart.cloudflareaccess.comNot in the scope2026-11-14
hartmann.cloudflareaccess.comNot in the scope2026-11-14
hashkings.cloudflareaccess.comNot in the scope2026-11-14
hatatech.cloudflareaccess.comNot in the scope2026-11-14
hauerland.cloudflareaccess.comNot in the scope2026-11-14
hauptj.cloudflareaccess.comNot in the scope2026-11-14
haven1network.cloudflareaccess.comNot in the scope2026-11-14
hawaii.cloudflareaccess.comNot in the scope2026-11-14
hawkhost.cloudflareaccess.comNot in the scope2026-11-14
hawkservers.cloudflareaccess.comNot in the scope2026-11-14
haydn.cloudflareaccess.comNot in the scope2026-11-14
haylixtest.cloudflareaccess.comNot in the scope2026-11-14
haymanlaw.cloudflareaccess.comNot in the scope2026-11-14
haypp.cloudflareaccess.comNot in the scope2026-11-14
hbland.cloudflareaccess.comNot in the scope2026-11-14
hcad.cloudflareaccess.comNot in the scope2026-11-14
hdev.cloudflareaccess.comNot in the scope2026-11-14
healthbyro.cloudflareaccess.comNot in the scope2026-11-14
healthkart.cloudflareaccess.comNot in the scope2026-11-14
healthlink.cloudflareaccess.comNot in the scope2026-11-14
healthmeans.cloudflareaccess.comNot in the scope2026-11-14
healthyio.cloudflareaccess.comNot in the scope2026-11-14
heartgift.cloudflareaccess.comNot in the scope2026-11-14
heathmont.cloudflareaccess.comNot in the scope2026-11-14
hedservers.cloudflareaccess.comNot in the scope2026-11-14
hefamily.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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