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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
Scope
Name suggests
First seen
Text file24,298 names
Subdomains of Cloudflare Public Bug Bounty
NameScopeFirst seen
cf-204-93-173-8.cloudflare.comIn scope2026-11-14
cf-204-93-173-9.cloudflare.comIn scope2026-11-14
cf-204-93-177-106.cloudflare.comIn scope2026-11-14
cf-204-93-177-107.cloudflare.comIn scope2026-11-14
cf-204-93-177-112.cloudflare.comIn scope2026-11-14
cf-204-93-177-113.cloudflare.comIn scope2026-11-14
cf-204-93-177-17.cloudflare.comIn scope2026-11-14
cf-204-93-240-11.cloudflare.comIn scope2026-11-14
cf-204-93-240-12.cloudflare.comIn scope2026-11-14
cf-204-93-240-16.cloudflare.comIn scope2026-11-14
cf-204-93-240-20.cloudflare.comIn scope2026-11-14
cf-204-93-240-23.cloudflare.comIn scope2026-11-14
cf-204-93-240-26.cloudflare.comIn scope2026-11-14
cf-254-225.cloudflare.comIn scope2026-11-14
cf-be-fe-people245-61-23.cloudflare.comIn scope2026-11-14
cf-chauf-domel.cloudflare.comIn scope2026-11-14
cf-mija-173-245-53-195.cloudflare.comIn scope2026-11-14
cf-oste-173-245-48-18.cloudflare.comIn scope2026-11-14
cf-pro.cloudflare.comIn scope2026-11-14
cf-prof-199-27-128-216.cloudflare.comIn scope2026-11-14
cf-prot3-245-160.cloudflare.comIn scope2026-11-14
cf-prote-173-245-62-97.cloudflare.comIn scope2026-11-14
cf-prote0-93-250-35.cloudflare.comIn scope2026-11-14
cf-protect190-93-251-123.cloudflare.comIn scope2026-11-14
cf-protecte.cloudflare.comIn scope2026-11-14
cf-protected.cloudflare.comIn scope2026-11-14
cf-protected-assfeb-245-49-71.cloudflare.comIn scope2026-11-14
cf-protected-m.cloudflare.comIn scope2026-11-14
cf-protected-mailcf-199-27-135-163.cloudflare.comIn scope2026-11-14
cf-protected-www236.cloudflare.comIn scope2026-11-14
cf-protected-www3-249-203.cloudflare.comIn scope2026-11-14
cfdnscheck.cloudflare.comIn scope2026-11-14
challenges.cloudflare.comIn scope2026-11-14
challenges-staging.cloudflare.comstagingIn scope2026-11-14
brunhild.challenges.cloudflare.comIn scope2026-11-14
dnstest.challenges.cloudflare.comIn scope2026-11-14
alg13.dnstest.challenges.cloudflare.comIn scope2026-11-14
mldsa44.dnstest.challenges.cloudflare.comIn scope2026-11-14
hagen.challenges.cloudflare.comIn scope2026-11-14
ninjapanel.china.cloudflare.comIn scope2026-11-14
cicouldcn2.cloudflare.comIn scope2026-11-14
circles.cloudflare.comIn scope2026-11-14
citi-production-support.cloudflare.comIn scope2026-11-14
cf-protected-www.aqarmakka.com.cdn.cl22.cloudflare.comIn scope2026-11-14
clcouldcn2.cloudflare.comIn scope2026-11-14
cli-resty.cloudflare.comIn scope2026-11-14
cf-190-93-246-245.clo190-93-242-211.cloudflare.comIn scope2026-11-14
cf-173-245-56-249.clo55-171.cloudflare.comIn scope2026-11-14
cloe.cloudflare.comIn scope2026-11-14
cf-protected-cdn.primejb.com.cdn.clou-205.cloudflare.comIn scope2026-11-14
cf-protected-www.artisticprosthetics.com.cdn.clou-93-255-84.cloudflare.comIn scope2026-11-14
cf-protected-facilities.freba.com.cdn.clou199.cloudflare.comIn scope2026-11-14
ssl759877.cloud49.cloudflare.comIn scope2026-11-14
ssl316371.cloud8.cloudflare.comIn scope2026-11-14
cf-190-93-248-173.cloudf35.cloudflare.comIn scope2026-11-14
cf-protected-www.aalpha.in.cdn.cloudfl-148.cloudflare.comIn scope2026-11-14
cf-protected-www.ampac-academy.com.cdn.cloudfl9.cloudflare.comIn scope2026-11-14
cf-protected-www.airworthinessreview.com.au.cdn.cloudflar90-93-248-104.cloudflare.comIn scope2026-11-14
ssl320125.cloudflare2182.cloudflare.comIn scope2026-11-14
ssl745272.cloudflaresl7012.cloudflare.comIn scope2026-11-14
ssl760818.cloudflaressl.cloudflare.comIn scope2026-11-14
ssl898691.cloudflaressl86045.cloudflare.comIn scope2026-11-14
ssl746465.cloudfsl5526.cloudflare.comIn scope2026-11-14
cn.cloudflare.comIn scope2026-11-14
cnd.cloudflare.comIn scope2026-11-14
cndjs.cloudflare.comIn scope2026-11-14
cf-make.co173-245-60-164.cloudflare.comIn scope2026-11-14
cf-protected.chainreactioncycls.co22-57.cloudflare.comIn scope2026-11-14
cf-migration-dollartree.prod.bazaarvoice.co3-248-49.cloudflare.comIn scope2026-11-14
baringsinvestors.com.cloudflare.comIn scope2026-11-14
cf-ni.com51-44.cloudflare.comIn scope2026-11-14
www.bookexpoamerica.comcdnjs.cloudflare.comIn scope2026-11-14
ianheverett.comcdnjs.cloudflare.comIn scope2026-11-14
appcenter.intuit.comcdnjs.cloudflare.comIn scope2026-11-14
livebrandnew.comcdnjs.cloudflare.comIn scope2026-11-14
nfljapan.comcdnjs.cloudflare.comIn scope2026-11-14
petitebiz.comcdnjs.cloudflare.comIn scope2026-11-14
www.tangeroutletcanada.comcdnjs.cloudflare.comIn scope2026-11-14
jp.ufc.comcdnjs.cloudflare.comIn scope2026-11-14
community.cloudflare.comListed out of scope2026-11-14
staging.community.cloudflare.comstagingIn scope2026-11-14
suspectsinc.comwww.cloudflare.comIn scope2026-11-14
cf-ev002-204.encs.concor173-245-56-215.cloudflare.comIn scope2026-11-14
containers.cloudflare.comIn scope2026-11-14
ssh.containers.cloudflare.comIn scope2026-11-14
content.cloudflare.comIn scope2026-11-14
core-backbone.cloudflare.comIn scope2026-11-14
cortney.cloudflare.comIn scope2026-11-14
ssl314825.cloudflaressl.cossl1.cloudflare.comIn scope2026-11-14
cp.cloudflare.comIn scope2026-11-14
cp-demo.cloudflare.comtestIn scope2026-11-14
cp-testing.cloudflare.comtestIn scope2026-11-14
cp10.cloudflare.comIn scope2026-11-14
cp11.cloudflare.comIn scope2026-11-14
cp12.cloudflare.comIn scope2026-11-14
staging.cp12.cloudflare.comstagingIn scope2026-11-14
cp13.cloudflare.comIn scope2026-11-14
cp2.cloudflare.comIn scope2026-11-14
cp3.cloudflare.comIn scope2026-11-14
staging.cp3.cloudflare.comstagingIn 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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