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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
netnod-ix-ge-b-gbg-1500.cloudflare.comIn scope2026-11-14
netnod-ix-ge-b-gbg-4470.cloudflare.comIn scope2026-11-14
netnod-ix-ge-b-sth-1500.cloudflare.comIn scope2026-11-14
netnod-ix-ge-b-sth-4470.cloudflare.comIn scope2026-11-14
netnod-ix-hel-blue-9000.cloudflare.comIn scope2026-11-14
netnod-ix-hel-green-9000.cloudflare.comIn scope2026-11-14
tutorialesew.netsupport.cloudflare.comIn scope2026-11-14
next.cloudflare.comIn scope2026-11-14
niki.cloudflare.comIn scope2026-11-14
nina.cloudflare.comIn scope2026-11-14
ninjapanel.cloudflare.comIn scope2026-11-14
ninjapanel-bypass-cfaccess.cloudflare.comIn scope2026-11-14
nix4.cloudflare.comIn scope2026-11-14
nixsk1.cloudflare.comIn scope2026-11-14
nl.cloudflare.comIn scope2026-11-14
nl-server-loc.cloudflare.comIn scope2026-11-14
no.cloudflare.comIn scope2026-11-14
noah.cloudflare.comIn scope2026-11-14
node01aac242aa71e.cloudflare.comIn scope2026-11-14
node1188f.cloudflare.comIn scope2026-11-14
node13108712a5.cloudflare.comIn scope2026-11-14
node14554.cloudflare.comIn scope2026-11-14
node18564.cloudflare.comIn scope2026-11-14
node1b214.cloudflare.comIn scope2026-11-14
node21cfe.cloudflare.comIn scope2026-11-14
node2e818.cloudflare.comIn scope2026-11-14
node30c459.cloudflare.comIn scope2026-11-14
node34b33.cloudflare.comIn scope2026-11-14
node3a9fd.cloudflare.comIn scope2026-11-14
node3c3f2.cloudflare.comIn scope2026-11-14
node3e0bc.cloudflare.comIn scope2026-11-14
node403f1.cloudflare.comIn scope2026-11-14
node4562b.cloudflare.comIn scope2026-11-14
node45efc5ad2089725.cloudflare.comIn scope2026-11-14
node57422e184b5f.cloudflare.comIn scope2026-11-14
node574d1.cloudflare.comIn scope2026-11-14
node5e7be56.cloudflare.comIn scope2026-11-14
node653ef.cloudflare.comIn scope2026-11-14
node67331.cloudflare.comIn scope2026-11-14
node6b01b.cloudflare.comIn scope2026-11-14
node6d00d.cloudflare.comIn scope2026-11-14
node73429.cloudflare.comIn scope2026-11-14
node76-23de4562b.cloudflare.comIn scope2026-11-14
node78270b097.cloudflare.comIn scope2026-11-14
node79e08.cloudflare.comIn scope2026-11-14
node81b18e034b.cloudflare.comIn scope2026-11-14
node87eb2.cloudflare.comIn scope2026-11-14
node8953b6900e11f6b.cloudflare.comIn scope2026-11-14
node8b1cf6694af779.cloudflare.comIn scope2026-11-14
node8ca6e05d056.cloudflare.comIn scope2026-11-14
node904d3.cloudflare.comIn scope2026-11-14
node97872282ebc0.cloudflare.comIn scope2026-11-14
node991e5.cloudflare.comIn scope2026-11-14
nodea237da71584.cloudflare.comIn scope2026-11-14
nodea2665.cloudflare.comIn scope2026-11-14
nodea4d68.cloudflare.comIn scope2026-11-14
nodea91f2.cloudflare.comIn scope2026-11-14
nodea9248.cloudflare.comIn scope2026-11-14
nodeacc5a2564e.cloudflare.comIn scope2026-11-14
nodeae261.cloudflare.comIn scope2026-11-14
nodeaf499a463.cloudflare.comIn scope2026-11-14
nodebd297.cloudflare.comIn scope2026-11-14
nodebeec4.cloudflare.comIn scope2026-11-14
nodecc1497ed4f2d.cloudflare.comIn scope2026-11-14
nodee710d9f15534bd3.cloudflare.comIn scope2026-11-14
nodee8f49c9c.cloudflare.comIn scope2026-11-14
nodeed8f6.cloudflare.comIn scope2026-11-14
nodef4a9974c2350b01.cloudflare.comIn scope2026-11-14
nodef9b45c0.cloudflare.comIn scope2026-11-14
nodefb295fb1369df7.cloudflare.comIn scope2026-11-14
nodefcfb9.cloudflare.comIn scope2026-11-14
nodefdef3.cloudflare.comIn scope2026-11-14
nodeffc62.cloudflare.comIn scope2026-11-14
non-cdn.cloudflare.comIn scope2026-11-14
norman.cloudflare.comIn scope2026-11-14
notebooks.cloudflare.comIn scope2026-11-14
adventure.notebooks.cloudflare.comIn scope2026-11-14
api-proxy.notebooks.cloudflare.comapiIn scope2026-11-14
examples.notebooks.cloudflare.comIn scope2026-11-14
examples-api-proxy.notebooks.cloudflare.comapiIn scope2026-11-14
notifications.cloudflare.comIn scope2026-11-14
admin.notifications.cloudflare.comadminIn scope2026-11-14
api.notifications.cloudflare.comapiIn scope2026-11-14
api-staging.notifications.cloudflare.comapi, stagingIn scope2026-11-14
notify.cloudflare.comIn scope2026-11-14
cfps-email-worker.notify.cloudflare.comIn scope2026-11-14
cfps-email-worker-staging.notify.cloudflare.comstagingIn scope2026-11-14
email-assets.notify.cloudflare.comIn scope2026-11-14
email-assets-staging.notify.cloudflare.comstagingIn scope2026-11-14
ns.cloudflare.comIn scope2026-11-14
32.154.224.104.ns.cloudflare.comIn scope2026-11-14
111emma.ns.cloudflare.comIn scope2026-11-14
1amit.ns.cloudflare.comIn scope2026-11-14
1olga.ns.cloudflare.comIn scope2026-11-14
220-iris.ns.cloudflare.comIn scope2026-11-14
220-lynn.ns.cloudflare.comIn scope2026-11-14
220-nibs.ns.cloudflare.comIn scope2026-11-14
220-sara.ns.cloudflare.comIn scope2026-11-14
222kip.ns.cloudflare.comIn scope2026-11-14
aaden.ns.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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