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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
kdrl-website-pages.cloudflareaccess.comNot in the scope2026-11-14
keem.cloudflareaccess.comNot in the scope2026-11-14
kellyon.cloudflareaccess.comNot in the scope2026-11-14
kelmar.cloudflareaccess.comNot in the scope2026-11-14
kenmaxwardev.cloudflareaccess.comNot in the scope2026-11-14
kennedy.cloudflareaccess.comNot in the scope2026-11-14
kennyatx.cloudflareaccess.comNot in the scope2026-11-14
kentrichards.cloudflareaccess.comNot in the scope2026-11-14
kenwong.cloudflareaccess.comNot in the scope2026-11-14
kenzietechn.cloudflareaccess.comNot in the scope2026-11-14
ker-portal.cloudflareaccess.comNot in the scope2026-11-14
keremarca.cloudflareaccess.comNot in the scope2026-11-14
kernelpanic-poland.cloudflareaccess.comNot in the scope2026-11-14
kero.cloudflareaccess.comNot in the scope2026-11-14
keshavgyawali.cloudflareaccess.comNot in the scope2026-11-14
keuze.cloudflareaccess.comNot in the scope2026-11-14
kevintoms.cloudflareaccess.comNot in the scope2026-11-14
kevsully.cloudflareaccess.comNot in the scope2026-11-14
keyflowab.cloudflareaccess.comNot in the scope2026-11-14
kfrdw.cloudflareaccess.comNot in the scope2026-11-14
kfsg.cloudflareaccess.comNot in the scope2026-11-14
khahn.cloudflareaccess.comNot in the scope2026-11-14
khoahocnews.cloudflareaccess.comNot in the scope2026-11-14
khteam.cloudflareaccess.comNot in the scope2026-11-14
kick.cloudflareaccess.comNot in the scope2026-11-14
kidde.cloudflareaccess.comNot in the scope2026-11-14
kiddsplex.cloudflareaccess.comNot in the scope2026-11-14
kidzadvizor.cloudflareaccess.comNot in the scope2026-11-14
kiksha.cloudflareaccess.comNot in the scope2026-11-14
kingswaysoft.cloudflareaccess.comNot in the scope2026-11-14
kingznet.cloudflareaccess.comNot in the scope2026-11-14
kiosion.cloudflareaccess.comNot in the scope2026-11-14
kipper.cloudflareaccess.comNot in the scope2026-11-14
kira.cloudflareaccess.comNot in the scope2026-11-14
kithubcentral.cloudflareaccess.comNot in the scope2026-11-14
kittys.cloudflareaccess.comNot in the scope2026-11-14
kiwi.cloudflareaccess.comNot in the scope2026-11-14
kjs.cloudflareaccess.comNot in the scope2026-11-14
kkk.cloudflareaccess.comNot in the scope2026-11-14
klanthost.cloudflareaccess.comNot in the scope2026-11-14
klaucode.cloudflareaccess.comNot in the scope2026-11-14
klavier.cloudflareaccess.comNot in the scope2026-11-14
klavierschulemin.cloudflareaccess.comNot in the scope2026-11-14
kloa.cloudflareaccess.comNot in the scope2026-11-14
kloudkit.cloudflareaccess.comNot in the scope2026-11-14
klppl.cloudflareaccess.comNot in the scope2026-11-14
klym.cloudflareaccess.comNot in the scope2026-11-14
kmddev.cloudflareaccess.comNot in the scope2026-11-14
kmvdigital.cloudflareaccess.comNot in the scope2026-11-14
knapish.cloudflareaccess.comNot in the scope2026-11-14
knot-test.cloudflareaccess.comtestNot in the scope2026-11-14
knowledgemanagement.cloudflareaccess.comNot in the scope2026-11-14
knowyourmoney.cloudflareaccess.comNot in the scope2026-11-14
knpa.cloudflareaccess.comNot in the scope2026-11-14
ko.cloudflareaccess.comNot in the scope2026-11-14
koalan.cloudflareaccess.comNot in the scope2026-11-14
kobi5.cloudflareaccess.comNot in the scope2026-11-14
koebersmaegler.cloudflareaccess.comNot in the scope2026-11-14
komodo-dev.cloudflareaccess.comdevNot in the scope2026-11-14
komplex3.cloudflareaccess.comNot in the scope2026-11-14
konstructive.cloudflareaccess.comNot in the scope2026-11-14
korben.cloudflareaccess.comNot in the scope2026-11-14
korcom.cloudflareaccess.comNot in the scope2026-11-14
korosys.cloudflareaccess.comNot in the scope2026-11-14
koumuu.cloudflareaccess.comNot in the scope2026-11-14
kourades.cloudflareaccess.comNot in the scope2026-11-14
kowalskie.cloudflareaccess.comNot in the scope2026-11-14
kpaph.cloudflareaccess.comNot in the scope2026-11-14
kpax.cloudflareaccess.comNot in the scope2026-11-14
kpheartspapa.cloudflareaccess.comNot in the scope2026-11-14
kr00lix.cloudflareaccess.comNot in the scope2026-11-14
kr40.cloudflareaccess.comNot in the scope2026-11-14
krbtgt.cloudflareaccess.comNot in the scope2026-11-14
kreativpower.cloudflareaccess.comNot in the scope2026-11-14
kreditbee.cloudflareaccess.comNot in the scope2026-11-14
krishna.cloudflareaccess.comNot in the scope2026-11-14
ks-inventory-api.cloudflareaccess.comapiNot in the scope2026-11-14
ks-invoice-api.cloudflareaccess.comapiNot in the scope2026-11-14
ks-limits-api.cloudflareaccess.comapiNot in the scope2026-11-14
ks-order-api.cloudflareaccess.comapiNot in the scope2026-11-14
ks-program-api.cloudflareaccess.comapiNot in the scope2026-11-14
ks-vendingtransactions-mq0.cloudflareaccess.comNot in the scope2026-11-14
ks-vendingtransactions-mq1.cloudflareaccess.comNot in the scope2026-11-14
ks-vendingtransactions-mq2.cloudflareaccess.comNot in the scope2026-11-14
ks-vendingtransactions-mq3.cloudflareaccess.comNot in the scope2026-11-14
ks-vendingtransactions-mq4.cloudflareaccess.comNot in the scope2026-11-14
ksa.cloudflareaccess.comNot in the scope2026-11-14
ksfamilynas.cloudflareaccess.comNot in the scope2026-11-14
kubernetes.cloudflareaccess.comtoolsNot in the scope2026-11-14
kuchler123.cloudflareaccess.comNot in the scope2026-11-14
kuczdock.cloudflareaccess.comNot in the scope2026-11-14
kudelski.cloudflareaccess.comNot in the scope2026-11-14
kudelskicfsso.cloudflareaccess.comNot in the scope2026-11-14
kudelskisecurity.cloudflareaccess.comNot in the scope2026-11-14
kunnapas.cloudflareaccess.comNot in the scope2026-11-14
kurumi.cloudflareaccess.comNot in the scope2026-11-14
kwizkwiz.cloudflareaccess.comNot in the scope2026-11-14
kwolters.cloudflareaccess.comNot in the scope2026-11-14
kyc.cloudflareaccess.comNot in the scope2026-11-14
kyklo.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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