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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:cloudflareworkers.com
Scope
Name suggests
First seen
Text fileClear filters465 names
Subdomains of Cloudflare Public Bug Bounty
NameScopeFirst seen
coderunner.apply.cloudflareworkers.comNot in the scope2026-11-14
files.apply.cloudflareworkers.comdataNot in the scope2026-11-14
pairup.apply.cloudflareworkers.comNot in the scope2026-11-14
toolbox.apply.cloudflareworkers.comNot in the scope2026-11-14
toolbox-v2.apply.cloudflareworkers.comNot in the scope2026-11-14
toolbox-v2-staging.apply.cloudflareworkers.comstagingNot in the scope2026-11-14
tools.apply.cloudflareworkers.comNot in the scope2026-11-14
assurance.cloudflareworkers.comNot in the scope2026-11-14
avg-antivirus-free.cloudflareworkers.comNot in the scope2026-11-14
awwufii5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
b0bcf845591d5152132ac7a17617ef07.cloudflareworkers.comNot in the scope2026-11-14
b12e6014847f5491dd28279cfcb4f1c6.cloudflareworkers.comNot in the scope2026-11-14
b200f4264e0b5ef0ba2e4ab37f03fda5.cloudflareworkers.comNot in the scope2026-11-14
b21a37df11245253f85e34217510d5cc.cloudflareworkers.comNot in the scope2026-11-14
b21c901e5baada470343ebfccaa1f31e.cloudflareworkers.comNot in the scope2026-11-14
b3b5e8fad9f753f7be7182aeb6f894cf.cloudflareworkers.comNot in the scope2026-11-14
b613ac69df88bb535012618f1ded3ff1.cloudflareworkers.comNot in the scope2026-11-14
b6c62f0949e0d55ab956cd5c6553153c.cloudflareworkers.comNot in the scope2026-11-14
b6d2b1fcefaf20ec81ea5ad6eb830499.cloudflareworkers.comNot in the scope2026-11-14
b83ef03af93ad1c872f8204ff5d1ebe0.cloudflareworkers.comNot in the scope2026-11-14
b8befdd026317b238457fa1e8602311a.cloudflareworkers.comNot in the scope2026-11-14
b9ae8bbdd26b615c600d2bd5a2bf5c2a.cloudflareworkers.comNot in the scope2026-11-14
b9d80e2e136017c9715507dd986fa31a.cloudflareworkers.comNot in the scope2026-11-14
ba06270297111885c3e0db852a2d2d98.cloudflareworkers.comNot in the scope2026-11-14
ba1abe0eff303eb625d6f5e4844b0a87.cloudflareworkers.comNot in the scope2026-11-14
bd202d1cf2cc28c9ce9be603ab5e43ea.cloudflareworkers.comNot in the scope2026-11-14
be673bf6c50afea151139167fc2babd0.cloudflareworkers.comNot in the scope2026-11-14
bf5a87d995122fd5854d56235fa14aeb.cloudflareworkers.comNot in the scope2026-11-14
birruss5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
birruss5aa406cd0promo.cloudflareworkers.comNot in the scope2026-11-14
bmzzxxx407834.cloudflareworkers.comNot in the scope2026-11-14
c22e4e08bd7e98ab01b1e8a40e830a8d.cloudflareworkers.comNot in the scope2026-11-14
c567b154a260ac0b07358837b67a326b.cloudflareworkers.comNot in the scope2026-11-14
c79bd77bf5145449c557d2ecef15d5fb.cloudflareworkers.comNot in the scope2026-11-14
ca1afcd361813a67bba2a1bb04e58657.cloudflareworkers.comNot in the scope2026-11-14
cc0a7.cloudflareworkers.comNot in the scope2026-11-14
cc37b111462288141f21b94c94a0c765.cloudflareworkers.comNot in the scope2026-11-14
cc84a77a196eb882163bbc1bf85e0f33.cloudflareworkers.comNot in the scope2026-11-14
cef55d88ceca35202b94ddbf64a70e5c.cloudflareworkers.comNot in the scope2026-11-14
cffbb689cf892ada6f38c36ee873c96c.cloudflareworkers.comNot in the scope2026-11-14
coronataxpros.cloudflareworkers.comNot in the scope2026-11-14
d05590212e59cdadea4888eae2516e02.cloudflareworkers.comNot in the scope2026-11-14
d2f292edab1628d5ca24f4df9f2279c.cloudflareworkers.comNot in the scope2026-11-14
www.d2f292edab1628d5ca24f4df9f2279c.cloudflareworkers.comNot in the scope2026-11-14
d33b0b78631a55158d58c1c5271508f8.cloudflareworkers.comNot in the scope2026-11-14
d3e97ae5e1997e859c4bfbc43477a97e.cloudflareworkers.comNot in the scope2026-11-14
d85dd904e1de22d9999a84ed0c537351.cloudflareworkers.comNot in the scope2026-11-14
d8de4f6920d4f1a689f5789dd97624cf.cloudflareworkers.comNot in the scope2026-11-14
da82751cf504af85aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
www.da82751cf504af85aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
dc39351c734bea8dbd1b32d5080c2d91.cloudflareworkers.comNot in the scope2026-11-14
dde8.cloudflareworkers.comNot in the scope2026-11-14
de47f72cc74b0eeed9f92fb3575dd43e.cloudflareworkers.comNot in the scope2026-11-14
de6a680097461af3eadbe555739a7b5c.cloudflareworkers.comNot in the scope2026-11-14
dee1.cloudflareworkers.comNot in the scope2026-11-14
deeooll1408817851c5607d9.cloudflareworkers.comNot in the scope2026-11-14
deeooll3077613018c5607d9.cloudflareworkers.comNot in the scope2026-11-14
dff555757727891caf9ab.cloudflareworkers.comNot in the scope2026-11-14
dff5557589730888caf9ab.cloudflareworkers.comNot in the scope2026-11-14
dwwooyi2059110402494615.cloudflareworkers.comNot in the scope2026-11-14
dwwooyi432924274494615.cloudflareworkers.comNot in the scope2026-11-14
e0489196e1932985b65f557a73d68d9d.cloudflareworkers.comNot in the scope2026-11-14
e38330a7bddd054f8ff640b6569e820b.cloudflareworkers.comNot in the scope2026-11-14
e3ei8t9n3a7g4689ariuee32kei8k497745681dc.cloudflareworkers.comNot in the scope2026-11-14
e4f01fe997f003c1e93a17be2b0fe828.cloudflareworkers.comNot in the scope2026-11-14
e57dfdeb4e8c828e5c4c1e1e9e234076.cloudflareworkers.comNot in the scope2026-11-14
e6dc87de3a67d6b9ccfe5ce4a297ea6a.cloudflareworkers.comNot in the scope2026-11-14
e6f4531dfb8bdc8fc7f973830947113a.cloudflareworkers.comNot in the scope2026-11-14
e7aow8h44aats2225a2aa8f4qga7w47826b8f577.cloudflareworkers.comNot in the scope2026-11-14
e830a8d-0ddaaaw19651178005b8a01.cloudflareworkers.comNot in the scope2026-11-14
e8b70499bfa67a9a602c20edcf0f1d6f.cloudflareworkers.comNot in the scope2026-11-14
e9c1214832676c018f9cd72f432f699b.cloudflareworkers.comNot in the scope2026-11-14
eb49635099e5990dbc268169b7ef6735.cloudflareworkers.comNot in the scope2026-11-14
eb5413e45e073c3bc5bc067aea09b52e.cloudflareworkers.comNot in the scope2026-11-14
ebf6bee7249e2d9395ee40df4552d81b.cloudflareworkers.comNot in the scope2026-11-14
ecc769ca242b8ffd52afe82a2a01dead.cloudflareworkers.comNot in the scope2026-11-14
ed2df947e6baee9502b5d496daed4d13.cloudflareworkers.comNot in the scope2026-11-14
edge-chat-demo.cloudflareworkers.comtestNot in the scope2026-11-14
eedd22512541248932c4cc7.cloudflareworkers.comNot in the scope2026-11-14
eedd2258995155552c4cc7.cloudflareworkers.comNot in the scope2026-11-14
eef9.cloudflareworkers.comNot in the scope2026-11-14
ef55953ab86fb0a9f06377c7e73d8481.cloudflareworkers.comNot in the scope2026-11-14
ef710337547860f7d11ab1e639b2e723.cloudflareworkers.comNot in the scope2026-11-14
examples.cloudflareworkers.comNot in the scope2026-11-14
f30e404a7ea1a18d1571b2522464fc75.cloudflareworkers.comNot in the scope2026-11-14
f49eb72aade878f58bf8729c43f0492a.cloudflareworkers.comNot in the scope2026-11-14
f646f0826739db05ccfe75bcf6ae3c42.cloudflareworkers.comNot in the scope2026-11-14
f6ad49d378c3d2cc378d88f221b43013.cloudflareworkers.comNot in the scope2026-11-14
f6e47af314bd8303303623c4173ff459.cloudflareworkers.comNot in the scope2026-11-14
f7b9eb582ad66f2e3910b800aa992ae0.cloudflareworkers.comNot in the scope2026-11-14
f830ce9e3069810afab24c02aa935397.cloudflareworkers.comNot in the scope2026-11-14
f985876a009b7990650ec305863da08c.cloudflareworkers.comNot in the scope2026-11-14
f9ab.cloudflareworkers.comNot in the scope2026-11-14
fa5576c3bce4204f9d107f0ba12cde21.cloudflareworkers.comNot in the scope2026-11-14
fa73.cloudflareworkers.comNot in the scope2026-11-14
fad78d8b4f16d61d7d60db3030c976a4.cloudflareworkers.comNot in the scope2026-11-14
fb3ee57a97afbf06db43b7cb1c6c215f.cloudflareworkers.comNot in the scope2026-11-14
fcf643460cf0d807d238c8cd4a8ddc0c.cloudflareworkers.comNot in the scope2026-11-14
ffjjjii4622105671210c2b.cloudflareworkers.comNot in the scope2026-11-14
ffjjjii5758154601210c2b.cloudflareworkers.comNot in the 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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Updated