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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
24,296
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() function#1478633Injection and Smuggling2022-05-16$6,000116
Cloudflare CASB Confused Deputy Problem#1952124No weakness recorded2023-06-07$3,30097
Using special IPv4-mapped IPv6 addresses to bypass local IP ban#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 Forwarding#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 it#3211031Cross-site Scripting2025-09-30$55075
Yet Another CASB Integration Takeover of Active Integrations#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 AccessTempAuth#3423950Cross-site Scripting2026-04-14–63
AI Playground XSS to steal user-chat messages and access to connected MCP Server#3424998Cross-site Scripting2026-02-26–62
Bypass R2 payment screen#2170559Authentication2023-11-10$35057

Subdomains24,296

Root
Scope
Name suggests
First seen
Text file24,296 names
Subdomains of Cloudflare Public Bug Bounty
NameScopeFirst seen
magic-number-219.cdn.cloudflare.comIn scope2026-11-14
magic-number-22.cdn.cloudflare.comIn scope2026-11-14
magic-number-220.cdn.cloudflare.comIn scope2026-11-14
magic-number-222.cdn.cloudflare.comIn scope2026-11-14
magic-number-223.cdn.cloudflare.comIn scope2026-11-14
magic-number-224.cdn.cloudflare.comIn scope2026-11-14
magic-number-225.cdn.cloudflare.comIn scope2026-11-14
magic-number-226.cdn.cloudflare.comIn scope2026-11-14
magic-number-227.cdn.cloudflare.comIn scope2026-11-14
magic-number-229.cdn.cloudflare.comIn scope2026-11-14
magic-number-23.cdn.cloudflare.comIn scope2026-11-14
magic-number-230.cdn.cloudflare.comIn scope2026-11-14
magic-number-231.cdn.cloudflare.comIn scope2026-11-14
magic-number-233.cdn.cloudflare.comIn scope2026-11-14
magic-number-234.cdn.cloudflare.comIn scope2026-11-14
magic-number-235.cdn.cloudflare.comIn scope2026-11-14
magic-number-236.cdn.cloudflare.comIn scope2026-11-14
magic-number-237.cdn.cloudflare.comIn scope2026-11-14
magic-number-238.cdn.cloudflare.comIn scope2026-11-14
magic-number-241.cdn.cloudflare.comIn scope2026-11-14
magic-number-242.cdn.cloudflare.comIn scope2026-11-14
magic-number-243.cdn.cloudflare.comIn scope2026-11-14
magic-number-244.cdn.cloudflare.comIn scope2026-11-14
magic-number-247.cdn.cloudflare.comIn scope2026-11-14
magic-number-248.cdn.cloudflare.comIn scope2026-11-14
magic-number-250.cdn.cloudflare.comIn scope2026-11-14
magic-number-251.cdn.cloudflare.comIn scope2026-11-14
magic-number-252.cdn.cloudflare.comIn scope2026-11-14
magic-number-253.cdn.cloudflare.comIn scope2026-11-14
magic-number-26.cdn.cloudflare.comIn scope2026-11-14
magic-number-27.cdn.cloudflare.comIn scope2026-11-14
magic-number-28.cdn.cloudflare.comIn scope2026-11-14
magic-number-29.cdn.cloudflare.comIn scope2026-11-14
magic-number-3.cdn.cloudflare.comIn scope2026-11-14
magic-number-30.cdn.cloudflare.comIn scope2026-11-14
magic-number-31.cdn.cloudflare.comIn scope2026-11-14
magic-number-33.cdn.cloudflare.comIn scope2026-11-14
magic-number-34.cdn.cloudflare.comIn scope2026-11-14
magic-number-35.cdn.cloudflare.comIn scope2026-11-14
magic-number-36.cdn.cloudflare.comIn scope2026-11-14
magic-number-37.cdn.cloudflare.comIn scope2026-11-14
magic-number-38.cdn.cloudflare.comIn scope2026-11-14
magic-number-4.cdn.cloudflare.comIn scope2026-11-14
magic-number-40.cdn.cloudflare.comIn scope2026-11-14
magic-number-41.cdn.cloudflare.comIn scope2026-11-14
magic-number-42.cdn.cloudflare.comIn scope2026-11-14
magic-number-43.cdn.cloudflare.comIn scope2026-11-14
magic-number-44.cdn.cloudflare.comIn scope2026-11-14
magic-number-45.cdn.cloudflare.comIn scope2026-11-14
magic-number-46.cdn.cloudflare.comIn scope2026-11-14
magic-number-48.cdn.cloudflare.comIn scope2026-11-14
magic-number-49.cdn.cloudflare.comIn scope2026-11-14
magic-number-5.cdn.cloudflare.comIn scope2026-11-14
magic-number-50.cdn.cloudflare.comIn scope2026-11-14
magic-number-52.cdn.cloudflare.comIn scope2026-11-14
magic-number-53.cdn.cloudflare.comIn scope2026-11-14
magic-number-54.cdn.cloudflare.comIn scope2026-11-14
magic-number-55.cdn.cloudflare.comIn scope2026-11-14
magic-number-56.cdn.cloudflare.comIn scope2026-11-14
magic-number-6.cdn.cloudflare.comIn scope2026-11-14
magic-number-60.cdn.cloudflare.comIn scope2026-11-14
magic-number-61.cdn.cloudflare.comIn scope2026-11-14
magic-number-62.cdn.cloudflare.comIn scope2026-11-14
magic-number-63.cdn.cloudflare.comIn scope2026-11-14
magic-number-64.cdn.cloudflare.comIn scope2026-11-14
magic-number-65.cdn.cloudflare.comIn scope2026-11-14
magic-number-66.cdn.cloudflare.comIn scope2026-11-14
magic-number-67.cdn.cloudflare.comIn scope2026-11-14
magic-number-69.cdn.cloudflare.comIn scope2026-11-14
magic-number-7.cdn.cloudflare.comIn scope2026-11-14
magic-number-70.cdn.cloudflare.comIn scope2026-11-14
magic-number-71.cdn.cloudflare.comIn scope2026-11-14
magic-number-72.cdn.cloudflare.comIn scope2026-11-14
magic-number-75.cdn.cloudflare.comIn scope2026-11-14
magic-number-76.cdn.cloudflare.comIn scope2026-11-14
magic-number-77.cdn.cloudflare.comIn scope2026-11-14
magic-number-78.cdn.cloudflare.comIn scope2026-11-14
magic-number-79.cdn.cloudflare.comIn scope2026-11-14
magic-number-8.cdn.cloudflare.comIn scope2026-11-14
magic-number-80.cdn.cloudflare.comIn scope2026-11-14
magic-number-81.cdn.cloudflare.comIn scope2026-11-14
magic-number-82.cdn.cloudflare.comIn scope2026-11-14
magic-number-86.cdn.cloudflare.comIn scope2026-11-14
magic-number-87.cdn.cloudflare.comIn scope2026-11-14
magic-number-88.cdn.cloudflare.comIn scope2026-11-14
magic-number-89.cdn.cloudflare.comIn scope2026-11-14
magic-number-9.cdn.cloudflare.comIn scope2026-11-14
magic-number-91.cdn.cloudflare.comIn scope2026-11-14
magic-number-92.cdn.cloudflare.comIn scope2026-11-14
magic-number-93.cdn.cloudflare.comIn scope2026-11-14
magic-number-95.cdn.cloudflare.comIn scope2026-11-14
magic-number-96.cdn.cloudflare.comIn scope2026-11-14
magic-number-97.cdn.cloudflare.comIn scope2026-11-14
magic-number-98.cdn.cloudflare.comIn scope2026-11-14
magic-number-99.cdn.cloudflare.comIn scope2026-11-14
www.pnefc.net.cdn.cloudflare.comIn scope2026-11-14
carnivori.altervista.org.cdn.cloudflare.comIn scope2026-11-14
famigliefelici.altervista.org.cdn.cloudflare.comIn scope2026-11-14
lavoriamoinsiemeonline.altervista.org.cdn.cloudflare.comIn scope2026-11-14
lectio.altervista.org.cdn.cloudflare.comIn scope2026-11-14

18,933 names are covered by the program's own scope; 0 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 2026-11-14.

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