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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
xsw15909mmvvbbv0ed35.cloudflareworkers.comNot in the scope2026-11-14
xsw16105hhieeol5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw164798869aai7fdde8.cloudflareworkers.comNot in the scope2026-11-14
xsw17044vjjjjjj5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw1714425667hhbf15418c65.cloudflareworkers.comNot in the scope2026-11-14
xsw17375mcxxxbb43aff92.cloudflareworkers.comNot in the scope2026-11-14
xsw17813yiffjjj5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw1795bbxxzzz6d5e5e.cloudflareworkers.comNot in the scope2026-11-14
xsw1841hddeooy5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw18548birruss5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw188627hhiiii5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw1915cmmxbbv40a0f9.cloudflareworkers.comNot in the scope2026-11-14
xsw2057099hhiie5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw21381ibxzzxv5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw21732jjiibbm5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw2215ieuussfcea09e353.cloudflareworkers.comNot in the scope2026-11-14
xsw223348869aai7fdde8.cloudflareworkers.comNot in the scope2026-11-14
xsw2283499hhiie5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw2299025667hhbf15418c65.cloudflareworkers.comNot in the scope2026-11-14
xsw23103bmzzxxx407834.cloudflareworkers.comNot in the scope2026-11-14
xsw2371786irrul5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw24250ibxzzxv5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw24250ibxzzxv5aa406cd0-155e4d37887304d6db97902fb9cac8f4.cloudflareworkers.comNot in the scope2026-11-14
xsw2431146666llcea09e353.cloudflareworkers.comNot in the scope2026-11-14
xsw25096hdeeool0d4560.cloudflareworkers.comNot in the scope2026-11-14
xsw2525f447788e131469.cloudflareworkers.comNot in the scope2026-11-14
www.xsw2525f447788e131469.cloudflareworkers.comNot in the scope2026-11-14
xsw25834hdeeool0d4560.cloudflareworkers.comNot in the scope2026-11-14
xsw26539birruss5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw27262hddeooy5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw27535cmmxbbv40a0f9.cloudflareworkers.comNot in the scope2026-11-14
xsw27593birruss5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw28688lkk94405aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw29000iiiiirr5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw29094bmzzxxx407834.cloudflareworkers.comNot in the scope2026-11-14
xsw2943lkk94405aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw29794eeuussf5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw3033ieeflllfcc706.cloudflareworkers.comNot in the scope2026-11-14
xsw3119986irrul5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw321077hhiiii5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw3234546666llcea09e353.cloudflareworkers.comNot in the scope2026-11-14
xsw32589ibxzzxv5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw372886irrul5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw3908eeuussf5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw398lkk94405aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw4123hhieeol5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw4128225667hbe62f1.cloudflareworkers.comNot in the scope2026-11-14
xsw4719hhkkrrnd7e1062d.cloudflareworkers.comNot in the scope2026-11-14
xsw5024bbxxzzz6d5e5e.cloudflareworkers.comNot in the scope2026-11-14
xsw6370ieeuuss5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw6945kk99800ec012a.cloudflareworkers.comNot in the scope2026-11-14
xsw695yiffjjj5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
2c10818a010f2.xsw695yiffjjj5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw7051kk99800ec012a.cloudflareworkers.comNot in the scope2026-11-14
xsw7129bbxxzzz6d5e5e.cloudflareworkers.comNot in the scope2026-11-14
xsw8470hdeeool0d4560.cloudflareworkers.comNot in the scope2026-11-14
xsw9199zxxxmmicea09e353.cloudflareworkers.comNot in the scope2026-11-14
xsw9252yiffjjj5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xsw9342kqncmvbd95c22.cloudflareworkers.comNot in the scope2026-11-14
xsw9394lsfibxz6d5e5e.cloudflareworkers.comNot in the scope2026-11-14
xswrandomyiffjjj5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
xxvvmmj2028603467db5f.cloudflareworkers.comNot in the scope2026-11-14
xxvvmmj323732610867db5f.cloudflareworkers.comNot in the scope2026-11-14
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.cloudflareworkers.comNot in the scope2026-11-14
zxxvvmm744a1e.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