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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:cloudflare.com
Scope
Name suggests
First seen
Text fileClear filters18,951 names
Subdomains of Cloudflare Public Bug Bounty
NameScopeFirst seen
staging.search.ai.cloudflare.comstagingIn scope2026-11-14
websearch.ai.cloudflare.comIn scope2026-11-14
binding-smoke.websearch.ai.cloudflare.comIn scope2026-11-14
aig.cloudflare.comIn scope2026-11-14
examples.aig.cloudflare.comIn scope2026-11-14
examples-staging.aig.cloudflare.comstagingIn scope2026-11-14
aim.cloudflare.comIn scope2026-11-14
1.aim.cloudflare.comIn scope2026-11-14
10.aim.cloudflare.comIn scope2026-11-14
2.aim.cloudflare.comIn scope2026-11-14
3.aim.cloudflare.comIn scope2026-11-14
4.aim.cloudflare.comIn scope2026-11-14
5.aim.cloudflare.comIn scope2026-11-14
6.aim.cloudflare.comIn scope2026-11-14
7.aim.cloudflare.comIn scope2026-11-14
8.aim.cloudflare.comIn scope2026-11-14
9.aim.cloudflare.comIn scope2026-11-14
c1.aim.cloudflare.comIn scope2026-11-14
c10.aim.cloudflare.comIn scope2026-11-14
c2.aim.cloudflare.comIn scope2026-11-14
c3.aim.cloudflare.comIn scope2026-11-14
c4.aim.cloudflare.comIn scope2026-11-14
c5.aim.cloudflare.comIn scope2026-11-14
c6.aim.cloudflare.comIn scope2026-11-14
c7.aim.cloudflare.comIn scope2026-11-14
c8.aim.cloudflare.comIn scope2026-11-14
c9.aim.cloudflare.comIn scope2026-11-14
ajax.cloudflare.comIn scope2026-11-14
www.ajax.cloudflare.comIn scope2026-11-14
akd-auditor.cloudflare.comIn scope2026-11-14
dev.akd-auditor.cloudflare.comdevIn scope2026-11-14
staging.akd-auditor.cloudflare.comstagingIn scope2026-11-14
cf-protected-www.aledacreatf-190-93-253-240.cloudflare.comIn scope2026-11-14
cf-protected-www.amommysperspectiv7-211.cloudflare.comIn scope2026-11-14
amp.cloudflare.comIn scope2026-11-14
amp-indiatimes-com.amp.cloudflare.comIn scope2026-11-14
amp-reddit-com.amp.cloudflare.comIn scope2026-11-14
amp-timeinc-net.amp.cloudflare.comIn scope2026-11-14
amp-tmz-com.amp.cloudflare.comIn scope2026-11-14
amp-usatoday-com.amp.cloudflare.comIn scope2026-11-14
example.com.amp.cloudflare.comIn scope2026-11-14
discovery.amp.cloudflare.comIn scope2026-11-14
es.amp.cloudflare.comIn scope2026-11-14
eventarte.es.amp.cloudflare.comIn scope2026-11-14
esc-escortbayan997-com.amp.cloudflare.comIn scope2026-11-14
example-com.amp.cloudflare.comIn scope2026-11-14
fn-lc.amp.cloudflare.comIn scope2026-11-14
klinzo-com.amp.cloudflare.comIn scope2026-11-14
m-tokopedia-com.amp.cloudflare.comIn scope2026-11-14
metro-co-uk.amp.cloudflare.comIn scope2026-11-14
style-rbc-ru.amp.cloudflare.comIn scope2026-11-14
thoughtcatalog-com.amp.cloudflare.comIn scope2026-11-14
us.amp.cloudflare.comIn scope2026-11-14
wildcard.amp.cloudflare.comIn scope2026-11-14
www.amp.cloudflare.comIn scope2026-11-14
www-majnooncomputer-net.amp.cloudflare.comIn scope2026-11-14
www-mirror-co-uk.amp.cloudflare.comIn scope2026-11-14
www-rvcj-com.amp.cloudflare.comIn scope2026-11-14
www-thaifrau-de.amp.cloudflare.comIn scope2026-11-14
www-theregister-co-uk.amp.cloudflare.comIn scope2026-11-14
www-tokopedia-com.amp.cloudflare.comIn scope2026-11-14
www-vice-com.amp.cloudflare.comIn scope2026-11-14
www-weygandt-de.amp.cloudflare.comIn scope2026-11-14
wywabmnie-pl.amp.cloudflare.comIn scope2026-11-14
your-domain.amp.cloudflare.comIn scope2026-11-14
cf-protected-www.angelush41-223-74.cloudflare.comIn scope2026-11-14
anti-virus.cloudflare.comIn scope2026-11-14
api.cloudflare.comapiIn scope2026-11-14
api-origin.cloudflare.comapiIn scope2026-11-14
au.api.cloudflare.comapiIn scope2026-11-14
docs.api.cloudflare.comapiIn scope2026-11-14
entrypoint-worker.api.cloudflare.comapiIn scope2026-11-14
gateway-entrypoint.api.cloudflare.comapiIn scope2026-11-14
canary.gateway.api.cloudflare.comapi, stagingIn scope2026-11-14
edge-production.gateway.api.cloudflare.comapiIn scope2026-11-14
production.gateway.api.cloudflare.comapiIn scope2026-11-14
apni1x-dcn.cloudflare.comIn scope2026-11-14
apollo.cloudflare.comIn scope2026-11-14
app.cloudflare.comIn scope2026-11-14
app-relay.cloudflare.comIn scope2026-11-14
appdev.cloudflare.comIn scope2026-11-14
apple-carry-relay.cloudflare.comIn scope2026-11-14
staging.apple-carry-relay.cloudflare.comstagingIn scope2026-11-14
apple-relay.cloudflare.comIn scope2026-11-14
staging.apple-relay.cloudflare.comstagingIn scope2026-11-14
ar.cloudflare.comIn scope2026-11-14
ipv4.de-cix.ham.de.as13335.cloudflare.comIn scope2026-11-14
ipv4.seecix.ath.gr.as13335.cloudflare.comIn scope2026-11-14
ipv4.de-cix.dfw.us.as13335.cloudflare.comIn scope2026-11-14
affiliate.ecomeasy.asiacdnjs.cloudflare.comIn scope2026-11-14
cf-protected-www.astrologycf-190-93-251-61.cloudflare.comIn scope2026-11-14
athena.cloudflare.comIn scope2026-11-14
auth.cloudflare.comauthIn scope2026-11-14
aws-flow-logs.cloudflare.commonitoringIn scope2026-11-14
aws-flow-logs-federal.cloudflare.commonitoringIn scope2026-11-14
vpc.staging.aws-flow-logs-federal.cloudflare.commonitoring, stagingIn scope2026-11-14
vpc.aws-flow-logs-federal.cloudflare.commonitoringIn scope2026-11-14
cf-protected-www.chato.blog.b.cloudflare.comIn scope2026-11-14
cf-protected-www.bagwellscf-190-93-252-199.cloudflare.comIn scope2026-11-14
barbara.cloudflare.comIn 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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