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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
dns.barbara.cloudflare.comIn scope2026-11-14
ipv4.de-cix.bcn.cloudflare.comIn scope2026-11-14
cf-protected-www.be9-27-135-44.cloudflare.comIn scope2026-11-14
bilemezsinki.cloudflare.comIn scope2026-11-14
blog.cloudflare.comIn scope2026-11-14
blog-staging.cloudflare.comstagingIn scope2026-11-14
ai-search.blog.cloudflare.comIn scope2026-11-14
api.blog.cloudflare.comapiIn scope2026-11-14
assets.blog.cloudflare.comIn scope2026-11-14
ghost.blog.cloudflare.comIn scope2026-11-14
new.blog.cloudflare.comIn scope2026-11-14
refresh.blog.cloudflare.comIn scope2026-11-14
search.blog.cloudflare.comIn scope2026-11-14
staging.blog.cloudflare.comstagingIn scope2026-11-14
www.blog.cloudflare.comIn scope2026-11-14
blogs.cloudflare.comIn scope2026-11-14
bounce.cloudflare.comIn scope2026-11-14
box.cloudflare.comIn scope2026-11-14
cf-protected-storage.chato.blog.br50.cloudflare.comIn scope2026-11-14
browser.cloudflare.comIn scope2026-11-14
drew.bv.cloudflare.comIn scope2026-11-14
cf-190-93-250-83.c168.cloudflare.comIn scope2026-11-14
c173-245-53-154.cloudflare.comIn scope2026-11-14
c173-245-61-80.cloudflare.comIn scope2026-11-14
190-92-46-221.reverse.cable4-22.cloudflare.comIn scope2026-11-14
190-92-74-69.reverse.cableco93-247-64.cloudflare.comIn scope2026-11-14
cac.cloudflare.comIn scope2026-11-14
downloads.cac.cloudflare.comIn scope2026-11-14
maps.cac.cloudflare.comIn scope2026-11-14
staging.cac.cloudflare.comstagingIn scope2026-11-14
downloads.staging.cac.cloudflare.comstagingIn scope2026-11-14
maps.staging.cac.cloudflare.comstagingIn scope2026-11-14
ui-maps.staging.cac.cloudflare.comstagingIn scope2026-11-14
ui-maps.cac.cloudflare.comIn scope2026-11-14
ccdnjs.cloudflare.comIn scope2026-11-14
cdenjs.cloudflare.comIn scope2026-11-14
cdjns.cloudflare.comIn scope2026-11-14
cdjs.cloudflare.comIn scope2026-11-14
cdn.cloudflare.comIn scope2026-11-14
cdn-cgi.cloudflare.comIn scope2026-11-14
cdn-static.cloudflare.comIn scope2026-11-14
www.cursoswebsite.com.ar.cdn.cloudflare.comIn scope2026-11-14
942c.biz.cdn.cloudflare.comIn scope2026-11-14
www.babybirdbakery.biz.cdn.cloudflare.comIn scope2026-11-14
www.redefrete.com.br.cdn.cloudflare.comIn scope2026-11-14
www.acadciencias.org.br.cdn.cloudflare.comIn scope2026-11-14
quasix.club.cdn.cloudflare.comIn scope2026-11-14
16796373.cn.cdn.cloudflare.comIn scope2026-11-14
www.1p2lt.cn.cdn.cloudflare.comIn scope2026-11-14
31638027.cn.cdn.cloudflare.comIn scope2026-11-14
53443537.cn.cdn.cloudflare.comIn scope2026-11-14
6gi22.cn.cdn.cloudflare.comIn scope2026-11-14
www.c667.com.cn.cdn.cloudflare.comIn scope2026-11-14
d7rl1.com.cn.cdn.cloudflare.comIn scope2026-11-14
dv18.com.cn.cdn.cloudflare.comIn scope2026-11-14
www.matijin.com.cn.cdn.cloudflare.comIn scope2026-11-14
jko6.cn.cdn.cloudflare.comIn scope2026-11-14
www.maphm.cn.cdn.cloudflare.comIn scope2026-11-14
mllpk.cn.cdn.cloudflare.comIn scope2026-11-14
pza8l.cn.cdn.cloudflare.comIn scope2026-11-14
www.q8wvt.cn.cdn.cloudflare.comIn scope2026-11-14
xv9a2.cn.cdn.cloudflare.comIn scope2026-11-14
2hhh2.com.cdn.cloudflare.comIn scope2026-11-14
3166188.com.cdn.cloudflare.comIn scope2026-11-14
4690947.com.cdn.cloudflare.comIn scope2026-11-14
5868273.com.cdn.cloudflare.comIn scope2026-11-14
www.85739257.com.cdn.cloudflare.comIn scope2026-11-14
9066367.com.cdn.cloudflare.comIn scope2026-11-14
www.abitibibowater.com.cdn.cloudflare.comIn scope2026-11-14
www.alchemyofsex.com.cdn.cloudflare.comIn scope2026-11-14
www.attofgwinnett.com.cdn.cloudflare.comIn scope2026-11-14
www.billing.dawsonhosting.com.cdn.cloudflare.comIn scope2026-11-14
www.foodosage.com.cdn.cloudflare.comIn scope2026-11-14
cf-protected-www.hip2share.com.cdn.cloudflare.comIn scope2026-11-14
www.hydroteckofficial.com.cdn.cloudflare.comIn scope2026-11-14
j32j.com.cdn.cloudflare.comIn scope2026-11-14
media-deals.jumia.com.cdn.cloudflare.comIn scope2026-11-14
registry.jumia.com.cdn.cloudflare.comtoolsIn scope2026-11-14
k23w.com.cdn.cloudflare.comIn scope2026-11-14
www.matherandpitts.com.cdn.cloudflare.comIn scope2026-11-14
www.mitrapol.com.cdn.cloudflare.comIn scope2026-11-14
www.newsorator.com.cdn.cloudflare.comIn scope2026-11-14
www.niemtree.com.cdn.cloudflare.comIn scope2026-11-14
nmg11x5z.com.cdn.cloudflare.comIn scope2026-11-14
www.oncered.com.cdn.cloudflare.comIn scope2026-11-14
www.p7hn.com.cdn.cloudflare.comIn scope2026-11-14
www.pebbleonline.com.cdn.cloudflare.comIn scope2026-11-14
www.priscillastuckey.com.cdn.cloudflare.comIn scope2026-11-14
image.providesupport.com.cdn.cloudflare.comIn scope2026-11-14
www.qihangsy17.com.cdn.cloudflare.comIn scope2026-11-14
www.snowgearfactorytoyou.com.cdn.cloudflare.comIn scope2026-11-14
www.spotlightdancestudio.com.cdn.cloudflare.comIn scope2026-11-14
szdzwkj.com.cdn.cloudflare.comIn scope2026-11-14
www.tecnoexperteu.com.cdn.cloudflare.comIn scope2026-11-14
formation.wilfried-vadon.com.cdn.cloudflare.comIn scope2026-11-14
www.zuhacks.com.cdn.cloudflare.comIn scope2026-11-14
presents.peta.de.cdn.cloudflare.comIn scope2026-11-14
www.tennis-analyses.info.cdn.cloudflare.comIn scope2026-11-14
cf-protected-www.akkiapparicette.it.cdn.cloudflare.comIn scope2026-11-14
jontedev.co.ke.cdn.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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