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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
target.ohttp.research.cloudflare.comIn scope2026-11-14
opaque.research.cloudflare.comIn scope2026-11-14
opaque-full.research.cloudflare.comIn scope2026-11-14
passcake.research.cloudflare.comIn scope2026-11-14
passcake-selfadmin.research.cloudflare.comIn scope2026-11-14
attester.pat.research.cloudflare.comIn scope2026-11-14
issuer.pat.research.cloudflare.comIn scope2026-11-14
origin.pat.research.cloudflare.comIn scope2026-11-14
pepe-debug.research.cloudflare.comIn scope2026-11-14
plexi-dev.research.cloudflare.comdevIn scope2026-11-14
plexi-staging.research.cloudflare.comstagingIn scope2026-11-14
ams.dev.plexi.research.cloudflare.comdevIn scope2026-11-14
pp-attester-google-account-dev.research.cloudflare.comdevIn scope2026-11-14
pp-attester-turnstile.research.cloudflare.comIn scope2026-11-14
pp-attester-turnstile-dev.research.cloudflare.comdevIn scope2026-11-14
pp-issuer-dev.research.cloudflare.comdevIn scope2026-11-14
pp-issuer-production.research.cloudflare.comIn scope2026-11-14
pp-issuer-public.research.cloudflare.comIn scope2026-11-14
pp-origin-dev.research.cloudflare.comdevIn scope2026-11-14
pp-origin-samsung-test.research.cloudflare.comtestIn scope2026-11-14
pp-pat.research.cloudflare.comIn scope2026-11-14
preview.research.cloudflare.comstagingIn scope2026-11-14
prio.research.cloudflare.comIn scope2026-11-14
collector.prio.research.cloudflare.comIn scope2026-11-14
helper.prio.research.cloudflare.comIn scope2026-11-14
leader.prio.research.cloudflare.comIn scope2026-11-14
privacypass-bakery.research.cloudflare.comIn scope2026-11-14
pst-issuer-dev.research.cloudflare.comdevIn scope2026-11-14
req-mtls.research.cloudflare.comIn scope2026-11-14
tls-flags.research.cloudflare.comIn scope2026-11-14
topaz.research.cloudflare.comIn scope2026-11-14
vidaf.research.cloudflare.comIn scope2026-11-14
website-worker.research.cloudflare.comIn scope2026-11-14
resty.cloudflare.comIn scope2026-11-14
190-92-76-232.revers90-93-243-35.cloudflare.comIn scope2026-11-14
190-92-7-33.rf-190-93-255-245.cloudflare.comIn scope2026-11-14
rix-tg-gw.cloudflare.comIn scope2026-11-14
rob.cloudflare.comIn scope2026-11-14
rose.cloudflare.comIn scope2026-11-14
roughtime.cloudflare.comIn scope2026-11-14
roxy.cloudflare.comIn scope2026-11-14
ns.roxy.cloudflare.comIn scope2026-11-14
rpki.cloudflare.comIn scope2026-11-14
enforce-first-as.rpki.cloudflare.comIn scope2026-11-14
invalid.rpki.cloudflare.comIn scope2026-11-14
r2.rpki.cloudflare.comIn scope2026-11-14
r2-staging.rpki.cloudflare.comstagingIn scope2026-11-14
valid.rpki.cloudflare.comIn scope2026-11-14
ru.cloudflare.comIn scope2026-11-14
ruthns.cloudflare.comIn scope2026-11-14
do.s.cloudflare.comIn scope2026-11-14
ma.s.cloudflare.comIn scope2026-11-14
ssl3.s69.cloudflare.comIn scope2026-11-14
s812.cloudflare.comIn scope2026-11-14
sales.cloudflare.comIn scope2026-11-14
sandbox.cloudflare.comtestIn scope2026-11-14
sandboxes.cloudflare.comIn scope2026-11-14
sara.cloudflare.comIn scope2026-11-14
satriaif1.cloudflare.comIn scope2026-11-14
scdnjs.cloudflare.comIn scope2026-11-14
sec.cloudflare.comIn scope2026-11-14
secfront.cloudflare.comIn scope2026-11-14
secondary.cloudflare.comIn scope2026-11-14
ns0001.secondary.cloudflare.comIn scope2026-11-14
ns0002.secondary.cloudflare.comIn scope2026-11-14
ns0003.secondary.cloudflare.comIn scope2026-11-14
ns0004.secondary.cloudflare.comIn scope2026-11-14
ns0005.secondary.cloudflare.comIn scope2026-11-14
ns0006.secondary.cloudflare.comIn scope2026-11-14
ns0007.secondary.cloudflare.comIn scope2026-11-14
ns0008.secondary.cloudflare.comIn scope2026-11-14
ns0009.secondary.cloudflare.comIn scope2026-11-14
ns0010.secondary.cloudflare.comIn scope2026-11-14
ns0011.secondary.cloudflare.comIn scope2026-11-14
ns0012.secondary.cloudflare.comIn scope2026-11-14
ns0013.secondary.cloudflare.comIn scope2026-11-14
ns0014.secondary.cloudflare.comIn scope2026-11-14
ns0015.secondary.cloudflare.comIn scope2026-11-14
ns0016.secondary.cloudflare.comIn scope2026-11-14
ns0017.secondary.cloudflare.comIn scope2026-11-14
ns0018.secondary.cloudflare.comIn scope2026-11-14
ns0019.secondary.cloudflare.comIn scope2026-11-14
ns0020.secondary.cloudflare.comIn scope2026-11-14
ns0021.secondary.cloudflare.comIn scope2026-11-14
ns0022.secondary.cloudflare.comIn scope2026-11-14
ns0023.secondary.cloudflare.comIn scope2026-11-14
ns0024.secondary.cloudflare.comIn scope2026-11-14
ns0025.secondary.cloudflare.comIn scope2026-11-14
ns0026.secondary.cloudflare.comIn scope2026-11-14
ns0027.secondary.cloudflare.comIn scope2026-11-14
ns0028.secondary.cloudflare.comIn scope2026-11-14
ns0029.secondary.cloudflare.comIn scope2026-11-14
ns0030.secondary.cloudflare.comIn scope2026-11-14
ns0031.secondary.cloudflare.comIn scope2026-11-14
ns0032.secondary.cloudflare.comIn scope2026-11-14
ns0033.secondary.cloudflare.comIn scope2026-11-14
ns0034.secondary.cloudflare.comIn scope2026-11-14
ns0035.secondary.cloudflare.comIn scope2026-11-14
ns0036.secondary.cloudflare.comIn scope2026-11-14
ns0037.secondary.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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