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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
fllhkkk7ae94a8.cloudflareworkers.comNot in the scope2026-11-14
hddeooy5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
hgggiiq165892636258c1eb.cloudflareworkers.comNot in the scope2026-11-14
hgggiiq210271891858c1eb.cloudflareworkers.comNot in the scope2026-11-14
hhdjj225143163365d158c.cloudflareworkers.comNot in the scope2026-11-14
hhieeol5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
hhiie5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
hhiiiiq5c72113.cloudflareworkers.comNot in the scope2026-11-14
hhkkrrnd7e1062d.cloudflareworkers.comNot in the scope2026-11-14
ibbmzzx6054205479e3a09.cloudflareworkers.comNot in the scope2026-11-14
ibxzzxv5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
ieeuuss5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
ihhjrrn5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
ihjjrrnb222f5.cloudflareworkers.comNot in the scope2026-11-14
ihkrrd7e1062d.cloudflareworkers.comNot in the scope2026-11-14
iiiiirr5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
iiqqlll15850320763de017.cloudflareworkers.comNot in the scope2026-11-14
iiqqlll16599258393de017.cloudflareworkers.comNot in the scope2026-11-14
iiqqlll168298053de017.cloudflareworkers.comNot in the scope2026-11-14
iirrrb222f5.cloudflareworkers.comNot in the scope2026-11-14
iqt2369ce84b67.cloudflareworkers.comNot in the scope2026-11-14
irrul5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
j2266669bdee1.cloudflareworkers.comNot in the scope2026-11-14
j26677l11804105639e3a09.cloudflareworkers.comNot in the scope2026-11-14
j26677l15759179879e3a09.cloudflareworkers.comNot in the scope2026-11-14
j26677l31558159619e3a09.cloudflareworkers.comNot in the scope2026-11-14
jibbmmzf13ad8.cloudflareworkers.comNot in the scope2026-11-14
jjiibbm5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
jrnnmmc1438325395958b6e.cloudflareworkers.comNot in the scope2026-11-14
jy84235198b21f7873078899cf5b.cloudflareworkers.comNot in the scope2026-11-14
www.jy84235198b21f7873078899cf5b.cloudflareworkers.comNot in the scope2026-11-14
kefalos-uncovered.cloudflareworkers.comNot in the scope2026-11-14
kk99800ec012a.cloudflareworkers.comNot in the scope2026-11-14
kkrnccc13076181599e3a09.cloudflareworkers.comNot in the scope2026-11-14
kkrnccc15570151959e3a09.cloudflareworkers.comNot in the scope2026-11-14
kkrnccc28032303019e3a09.cloudflareworkers.comNot in the scope2026-11-14
lhhkkqq12556231209bdee1.cloudflareworkers.comNot in the scope2026-11-14
lhhkkqq343304169bdee1.cloudflareworkers.comNot in the scope2026-11-14
lkk33445aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
lkk94405aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
llhkrrnb222f5.cloudflareworkers.comNot in the scope2026-11-14
llkk9995aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
lsfibxz6d5e5e.cloudflareworkers.comNot in the scope2026-11-14
mcxxxbb43aff92.cloudflareworkers.comNot in the scope2026-11-14
mmccxxxce84b67.cloudflareworkers.comNot in the scope2026-11-14
mmvvbbv0ed35.cloudflareworkers.comNot in the scope2026-11-14
mvbvvrrecd322eb.cloudflareworkers.comNot in the scope2026-11-14
ooyifjr918018101b55e12.cloudflareworkers.comNot in the scope2026-11-14
qibbxxz1631320711494615.cloudflareworkers.comNot in the scope2026-11-14
qll223314585366844d3ad.cloudflareworkers.comNot in the scope2026-11-14
qt2233613242192947fdde8.cloudflareworkers.comNot in the scope2026-11-14
qt2233628992198827fdde8.cloudflareworkers.comNot in the scope2026-11-14
qt223365190130147fdde8.cloudflareworkers.comNot in the scope2026-11-14
rawhttp.cloudflareworkers.comNot in the scope2026-11-14
rnccccm2499945275c72113.cloudflareworkers.comNot in the scope2026-11-14
rnccccm2810446225c72113.cloudflareworkers.comNot in the scope2026-11-14
rnccccm3133639895c72113.cloudflareworkers.comNot in the scope2026-11-14
rnmmcmm4b9f81f4c1.cloudflareworkers.comNot in the scope2026-11-14
rrhssjj7fdde8.cloudflareworkers.comNot in the scope2026-11-14
ruulkk95aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
sjj46660d4560.cloudflareworkers.comNot in the scope2026-11-14
sskqiic1662146299bdee1.cloudflareworkers.comNot in the scope2026-11-14
sskqiic3091844499bdee1.cloudflareworkers.comNot in the scope2026-11-14
sskqiic4629300889bdee1.cloudflareworkers.comNot in the scope2026-11-14
swai9jte8eo7r4356mwaa2knsiu8w496164d66df.cloudflareworkers.comNot in the scope2026-11-14
tt228865aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
tutorial.cloudflareworkers.comNot in the scope2026-11-14
udddfff359786950d4560.cloudflareworkers.comNot in the scope2026-11-14
udddfff9153299370d4560.cloudflareworkers.comNot in the scope2026-11-14
uulllkk1626220747fdde8.cloudflareworkers.comNot in the scope2026-11-14
uulllkk30391226587fdde8.cloudflareworkers.comNot in the scope2026-11-14
uussf5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
vjjhf2d5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
vvmjeud34eef9.cloudflareworkers.comNot in the scope2026-11-14
wa9dcs1oa8e30455hae7vtw3ei4t364164d66df.cloudflareworkers.comNot in the scope2026-11-14
wildcard.cloudflareworkers.comNot in the scope2026-11-14
workers-runtime-playground.cloudflareworkers.comNot in the scope2026-11-14
www.cloudflareworkers.comNot in the scope2026-11-14
xbbiirrce84b67.cloudflareworkers.comNot in the scope2026-11-14
xbbvvrr5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xmvvvjj27707317164ebb53.cloudflareworkers.comNot in the scope2026-11-14
xsw101157hhiiii5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw102628869aai7fdde8.cloudflareworkers.comNot in the scope2026-11-14
xsw10477mmvvbbv0ed35.cloudflareworkers.comNot in the scope2026-11-14
xsw10481ieeuuss5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw1104725667hhbf15418c65.cloudflareworkers.comNot in the scope2026-11-14
xsw11198ieeuuss5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw11619jibbmmzf13ad8.cloudflareworkers.comNot in the scope2026-11-14
xsw116259hhddde5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw11814zxxxmmicea09e353.cloudflareworkers.comNot in the scope2026-11-14
xsw12345nnccccmd95c22.cloudflareworkers.comNot in the scope2026-11-14
xsw12585jibbmmzf13ad8.cloudflareworkers.comNot in the scope2026-11-14
xsw13044kqncmvbd95c22.cloudflareworkers.comNot in the scope2026-11-14
xsw13137mmmmmmx5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw13528ieeflllfcc706.cloudflareworkers.comNot in the scope2026-11-14
xsw13542lsfibxz6d5e5e.cloudflareworkers.comNot in the scope2026-11-14
xsw13593bbxxzzz6d5e5e.cloudflareworkers.comNot in the scope2026-11-14
xsw13628ieeflllfcc706.cloudflareworkers.comNot in the scope2026-11-14
xsw14274birruss5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw15556bbxxzzz6d5e5e.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