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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
theo.ns.cloudflare.comIn scope2026-11-14
thomas.ns.cloudflare.comIn scope2026-11-14
tia.ns.cloudflare.comIn scope2026-11-14
tiffany.ns.cloudflare.comIn scope2026-11-14
tim.ns.cloudflare.comIn scope2026-11-14
tin.ns.cloudflare.comIn scope2026-11-14
tina.ns.cloudflare.comIn scope2026-11-14
tion.ns.cloudflare.comIn scope2026-11-14
titan.ns.cloudflare.comIn scope2026-11-14
toby.ns.cloudflare.comIn scope2026-11-14
todd.ns.cloudflare.comIn scope2026-11-14
tody.ns.cloudflare.comIn scope2026-11-14
tom.ns.cloudflare.comIn scope2026-11-14
tomas.ns.cloudflare.comIn scope2026-11-14
tony.ns.cloudflare.comIn scope2026-11-14
dns2.tony.ns.cloudflare.comIn scope2026-11-14
tori.ns.cloudflare.comIn scope2026-11-14
tosana.ns.cloudflare.comIn scope2026-11-14
tr.ns.cloudflare.comIn scope2026-11-14
trace.ns.cloudflare.comIn scope2026-11-14
treasure.ns.cloudflare.comIn scope2026-11-14
trevor.ns.cloudflare.comIn scope2026-11-14
trey.ns.cloudflare.comIn scope2026-11-14
tricia.ns.cloudflare.comIn scope2026-11-14
troy.ns.cloudflare.comIn scope2026-11-14
ue.ns.cloudflare.comIn scope2026-11-14
ugh.ns.cloudflare.comIn scope2026-11-14
ulla.ns.cloudflare.comIn scope2026-11-14
ullis.ns.cloudflare.comIn scope2026-11-14
uma.ns.cloudflare.comIn scope2026-11-14
uriah.ns.cloudflare.comIn scope2026-11-14
ursula.ns.cloudflare.comIn scope2026-11-14
val.ns.cloudflare.comIn scope2026-11-14
valentin.ns.cloudflare.comIn scope2026-11-14
van.ns.cloudflare.comIn scope2026-11-14
vasilii.ns.cloudflare.comIn scope2026-11-14
veda.ns.cloudflare.comIn scope2026-11-14
venkat.ns.cloudflare.comIn scope2026-11-14
venus.ns.cloudflare.comIn scope2026-11-14
venus1.ns.cloudflare.comIn scope2026-11-14
vera.ns.cloudflare.comIn scope2026-11-14
vern.ns.cloudflare.comIn scope2026-11-14
veronica.ns.cloudflare.comIn scope2026-11-14
vicente.ns.cloudflare.comIn scope2026-11-14
vick.ns.cloudflare.comIn scope2026-11-14
vicky.ns.cloudflare.comIn scope2026-11-14
vida.ns.cloudflare.comIn scope2026-11-14
viddy.ns.cloudflare.comIn scope2026-11-14
vin.ns.cloudflare.comIn scope2026-11-14
violet.ns.cloudflare.comIn scope2026-11-14
virginia.ns.cloudflare.comIn scope2026-11-14
vita.ns.cloudflare.comIn scope2026-11-14
vivienne.ns.cloudflare.comIn scope2026-11-14
dns2.hnvietnam.vnns1.hnvietnam.vnlynn.ns.cloudflare.comIn scope2026-11-14
ns1.webgiare.info.vnns5.vthost.vnray.ns.cloudflare.comIn scope2026-11-14
ns2.webgiare.info.vnns6.vthost.vnrihana.ns.cloudflare.comIn scope2026-11-14
dns1.hnvietnam.vnns2.hnvietnam.vntori.ns.cloudflare.comIn scope2026-11-14
vtani.ns.cloudflare.comIn scope2026-11-14
vv.ns.cloudflare.comIn scope2026-11-14
wait.ns.cloudflare.comIn scope2026-11-14
walk.ns.cloudflare.comIn scope2026-11-14
wally.ns.cloudflare.comIn scope2026-11-14
walt.ns.cloudflare.comIn scope2026-11-14
wanda.ns.cloudflare.comIn scope2026-11-14
watson.ns.cloudflare.comIn scope2026-11-14
wells.ns.cloudflare.comIn scope2026-11-14
wen.ns.cloudflare.comIn scope2026-11-14
wesley.ns.cloudflare.comIn scope2026-11-14
west.ns.cloudflare.comIn scope2026-11-14
weston.ns.cloudflare.comIn scope2026-11-14
will.ns.cloudflare.comIn scope2026-11-14
william.ns.cloudflare.comIn scope2026-11-14
wilson.ns.cloudflare.comIn scope2026-11-14
woz.ns.cloudflare.comIn scope2026-11-14
wren.ns.cloudflare.comIn scope2026-11-14
wwwlogan.ns.cloudflare.comIn scope2026-11-14
xeu.ns.cloudflare.comIn scope2026-11-14
ximena.ns.cloudflare.comIn scope2026-11-14
xn--ica-8cdk0f.ns.cloudflare.comIn scope2026-11-14
yadiel.ns.cloudflare.comIn scope2026-11-14
yahir.ns.cloudflare.comIn scope2026-11-14
yevgen.ns.cloudflare.comIn scope2026-11-14
yew.ns.cloudflare.comIn scope2026-11-14
yichun.ns.cloudflare.comIn scope2026-11-14
yisroel.ns.cloudflare.comIn scope2026-11-14
ynda.ns.cloudflare.comIn scope2026-11-14
ynn.ns.cloudflare.comIn scope2026-11-14
yolanda.ns.cloudflare.comIn scope2026-11-14
yoxall.ns.cloudflare.comIn scope2026-11-14
zac.ns.cloudflare.comIn scope2026-11-14
zahir.ns.cloudflare.comIn scope2026-11-14
zainab.ns.cloudflare.comIn scope2026-11-14
zara.ns.cloudflare.comIn scope2026-11-14
ns2.zara.ns.cloudflare.comIn scope2026-11-14
zara2.ns.cloudflare.comIn scope2026-11-14
zariyah.ns.cloudflare.comIn scope2026-11-14
zelda.ns.cloudflare.comIn scope2026-11-14
zenda.ns.cloudflare.comIn scope2026-11-14
zeus.ns.cloudflare.comIn scope2026-11-14
ziggy.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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