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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
cf-190-93-251-243.cloudflare.comIn scope2026-11-14
cf-190-93-251-244.cloudflare.comIn scope2026-11-14
cf-190-93-251-245.cloudflare.comIn scope2026-11-14
cf-190-93-251-246.cloudflare.comIn scope2026-11-14
cf-190-93-251-247.cloudflare.comIn scope2026-11-14
cf-190-93-251-248.cloudflare.comIn scope2026-11-14
cf-190-93-251-249.cloudflare.comIn scope2026-11-14
cf-190-93-251-25.cloudflare.comIn scope2026-11-14
cf-190-93-251-250.cloudflare.comIn scope2026-11-14
cf-190-93-251-251.cloudflare.comIn scope2026-11-14
cf-190-93-251-252.cloudflare.comIn scope2026-11-14
cf-190-93-251-253.cloudflare.comIn scope2026-11-14
cf-190-93-251-254.cloudflare.comIn scope2026-11-14
cf-190-93-251-26.cloudflare.comIn scope2026-11-14
cf-190-93-251-27.cloudflare.comIn scope2026-11-14
cf-190-93-251-28.cloudflare.comIn scope2026-11-14
cf-190-93-251-29.cloudflare.comIn scope2026-11-14
cf-190-93-251-30.cloudflare.comIn scope2026-11-14
cf-190-93-251-31.cloudflare.comIn scope2026-11-14
cf-190-93-251-32.cloudflare.comIn scope2026-11-14
cf-190-93-251-33.cloudflare.comIn scope2026-11-14
cf-190-93-251-34.cloudflare.comIn scope2026-11-14
cf-190-93-251-35.cloudflare.comIn scope2026-11-14
cf-190-93-251-36.cloudflare.comIn scope2026-11-14
cf-190-93-251-37.cloudflare.comIn scope2026-11-14
cf-190-93-251-38.cloudflare.comIn scope2026-11-14
cf-190-93-251-39.cloudflare.comIn scope2026-11-14
cf-190-93-251-4.cloudflare.comIn scope2026-11-14
cf-190-93-251-40.cloudflare.comIn scope2026-11-14
cf-190-93-251-41.cloudflare.comIn scope2026-11-14
cf-190-93-251-42.cloudflare.comIn scope2026-11-14
cf-190-93-251-43.cloudflare.comIn scope2026-11-14
cf-190-93-251-44.cloudflare.comIn scope2026-11-14
cf-190-93-251-45.cloudflare.comIn scope2026-11-14
cf-190-93-251-46.cloudflare.comIn scope2026-11-14
cf-190-93-251-47.cloudflare.comIn scope2026-11-14
cf-190-93-251-48.cloudflare.comIn scope2026-11-14
cf-190-93-251-49.cloudflare.comIn scope2026-11-14
cf-190-93-251-5.cloudflare.comIn scope2026-11-14
cf-190-93-251-50.cloudflare.comIn scope2026-11-14
cf-190-93-251-51.cloudflare.comIn scope2026-11-14
cf-190-93-251-52.cloudflare.comIn scope2026-11-14
cf-190-93-251-53.cloudflare.comIn scope2026-11-14
cf-190-93-251-54.cloudflare.comIn scope2026-11-14
cf-190-93-251-55.cloudflare.comIn scope2026-11-14
cf-190-93-251-56.cloudflare.comIn scope2026-11-14
cf-190-93-251-57.cloudflare.comIn scope2026-11-14
cf-190-93-251-58.cloudflare.comIn scope2026-11-14
cf-190-93-251-59.cloudflare.comIn scope2026-11-14
cf-190-93-251-6.cloudflare.comIn scope2026-11-14
cf-190-93-251-60.cloudflare.comIn scope2026-11-14
cf-190-93-251-61.cloudflare.comIn scope2026-11-14
cf-190-93-251-62.cloudflare.comIn scope2026-11-14
cf-190-93-251-63.cloudflare.comIn scope2026-11-14
cf-190-93-251-64.cloudflare.comIn scope2026-11-14
cf-190-93-251-65.cloudflare.comIn scope2026-11-14
cf-190-93-251-66.cloudflare.comIn scope2026-11-14
cf-190-93-251-67.cloudflare.comIn scope2026-11-14
cf-190-93-251-68.cloudflare.comIn scope2026-11-14
cf-190-93-251-69.cloudflare.comIn scope2026-11-14
cf-190-93-251-7.cloudflare.comIn scope2026-11-14
cf-190-93-251-70.cloudflare.comIn scope2026-11-14
cf-190-93-251-71.cloudflare.comIn scope2026-11-14
cf-190-93-251-72.cloudflare.comIn scope2026-11-14
cf-190-93-251-73.cloudflare.comIn scope2026-11-14
cf-190-93-251-74.cloudflare.comIn scope2026-11-14
cf-190-93-251-75.cloudflare.comIn scope2026-11-14
cf-190-93-251-76.cloudflare.comIn scope2026-11-14
cf-190-93-251-77.cloudflare.comIn scope2026-11-14
cf-190-93-251-78.cloudflare.comIn scope2026-11-14
cf-190-93-251-79.cloudflare.comIn scope2026-11-14
cf-190-93-251-8.cloudflare.comIn scope2026-11-14
cf-190-93-251-80.cloudflare.comIn scope2026-11-14
cf-190-93-251-81.cloudflare.comIn scope2026-11-14
cf-190-93-251-82.cloudflare.comIn scope2026-11-14
cf-190-93-251-83.cloudflare.comIn scope2026-11-14
cf-190-93-251-84.cloudflare.comIn scope2026-11-14
cf-190-93-251-85.cloudflare.comIn scope2026-11-14
cf-190-93-251-86.cloudflare.comIn scope2026-11-14
cf-190-93-251-87.cloudflare.comIn scope2026-11-14
cf-190-93-251-88.cloudflare.comIn scope2026-11-14
cf-190-93-251-89.cloudflare.comIn scope2026-11-14
cf-190-93-251-9.cloudflare.comIn scope2026-11-14
cf-190-93-251-90.cloudflare.comIn scope2026-11-14
cf-190-93-251-91.cloudflare.comIn scope2026-11-14
cf-190-93-251-92.cloudflare.comIn scope2026-11-14
cf-190-93-251-93.cloudflare.comIn scope2026-11-14
cf-190-93-251-94.cloudflare.comIn scope2026-11-14
cf-190-93-251-95.cloudflare.comIn scope2026-11-14
cf-190-93-251-96.cloudflare.comIn scope2026-11-14
cf-190-93-251-97.cloudflare.comIn scope2026-11-14
cf-190-93-251-98.cloudflare.comIn scope2026-11-14
cf-190-93-251-99.cloudflare.comIn scope2026-11-14
cf-190-93-252-10.cloudflare.comIn scope2026-11-14
cf-190-93-252-100.cloudflare.comIn scope2026-11-14
cf-190-93-252-101.cloudflare.comIn scope2026-11-14
cf-190-93-252-102.cloudflare.comIn scope2026-11-14
cf-190-93-252-103.cloudflare.comIn scope2026-11-14
cf-190-93-252-104.cloudflare.comIn scope2026-11-14
cf-190-93-252-105.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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