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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-173-245-62-213.cloudflare.comIn scope2026-11-14
cf-173-245-62-214.cloudflare.comIn scope2026-11-14
cf-173-245-62-215.cloudflare.comIn scope2026-11-14
cf-173-245-62-216.cloudflare.comIn scope2026-11-14
cf-173-245-62-217.cloudflare.comIn scope2026-11-14
cf-173-245-62-218.cloudflare.comIn scope2026-11-14
cf-173-245-62-219.cloudflare.comIn scope2026-11-14
cf-173-245-62-22.cloudflare.comIn scope2026-11-14
cf-173-245-62-220.cloudflare.comIn scope2026-11-14
cf-173-245-62-221.cloudflare.comIn scope2026-11-14
cf-173-245-62-222.cloudflare.comIn scope2026-11-14
cf-173-245-62-223.cloudflare.comIn scope2026-11-14
cf-173-245-62-224.cloudflare.comIn scope2026-11-14
cf-173-245-62-225.cloudflare.comIn scope2026-11-14
cf-173-245-62-226.cloudflare.comIn scope2026-11-14
cf-173-245-62-227.cloudflare.comIn scope2026-11-14
cf-173-245-62-228.cloudflare.comIn scope2026-11-14
cf-173-245-62-229.cloudflare.comIn scope2026-11-14
cf-173-245-62-23.cloudflare.comIn scope2026-11-14
cf-173-245-62-230.cloudflare.comIn scope2026-11-14
cf-173-245-62-231.cloudflare.comIn scope2026-11-14
cf-173-245-62-232.cloudflare.comIn scope2026-11-14
cf-173-245-62-233.cloudflare.comIn scope2026-11-14
cf-173-245-62-234.cloudflare.comIn scope2026-11-14
cf-173-245-62-235.cloudflare.comIn scope2026-11-14
cf-173-245-62-236.cloudflare.comIn scope2026-11-14
cf-173-245-62-237.cloudflare.comIn scope2026-11-14
cf-173-245-62-238.cloudflare.comIn scope2026-11-14
cf-173-245-62-239.cloudflare.comIn scope2026-11-14
cf-173-245-62-240.cloudflare.comIn scope2026-11-14
cf-173-245-62-241.cloudflare.comIn scope2026-11-14
cf-173-245-62-242.cloudflare.comIn scope2026-11-14
cf-173-245-62-243.cloudflare.comIn scope2026-11-14
cf-173-245-62-244.cloudflare.comIn scope2026-11-14
cf-173-245-62-245.cloudflare.comIn scope2026-11-14
cf-173-245-62-246.cloudflare.comIn scope2026-11-14
cf-173-245-62-247.cloudflare.comIn scope2026-11-14
cf-173-245-62-248.cloudflare.comIn scope2026-11-14
cf-173-245-62-249.cloudflare.comIn scope2026-11-14
cf-173-245-62-250.cloudflare.comIn scope2026-11-14
cf-173-245-62-60.cloudflare.comIn scope2026-11-14
cf-173-245-62-61.cloudflare.comIn scope2026-11-14
cf-173-245-62-62.cloudflare.comIn scope2026-11-14
cf-173-245-62-63.cloudflare.comIn scope2026-11-14
cf-173-245-62-64.cloudflare.comIn scope2026-11-14
cf-173-245-62-65.cloudflare.comIn scope2026-11-14
cf-173-245-62-66.cloudflare.comIn scope2026-11-14
cf-173-245-62-67.cloudflare.comIn scope2026-11-14
cf-173-245-62-68.cloudflare.comIn scope2026-11-14
cf-173-245-62-69.cloudflare.comIn scope2026-11-14
cf-173-245-62-70.cloudflare.comIn scope2026-11-14
cf-173-245-62-71.cloudflare.comIn scope2026-11-14
cf-173-245-62-72.cloudflare.comIn scope2026-11-14
cf-173-245-62-73.cloudflare.comIn scope2026-11-14
cf-173-245-62-74.cloudflare.comIn scope2026-11-14
cf-173-245-62-75.cloudflare.comIn scope2026-11-14
cf-173-245-62-76.cloudflare.comIn scope2026-11-14
cf-173-245-62-77.cloudflare.comIn scope2026-11-14
cf-173-245-62-78.cloudflare.comIn scope2026-11-14
cf-173-245-62-79.cloudflare.comIn scope2026-11-14
cf-173-245-62-80.cloudflare.comIn scope2026-11-14
cf-173-245-62-81.cloudflare.comIn scope2026-11-14
cf-173-245-62-82.cloudflare.comIn scope2026-11-14
cf-173-245-62-83.cloudflare.comIn scope2026-11-14
cf-173-245-62-84.cloudflare.comIn scope2026-11-14
cf-173-245-62-85.cloudflare.comIn scope2026-11-14
cf-173-245-62-86.cloudflare.comIn scope2026-11-14
cf-173-245-62-87.cloudflare.comIn scope2026-11-14
cf-173-245-62-88.cloudflare.comIn scope2026-11-14
cf-173-245-62-89.cloudflare.comIn scope2026-11-14
cf-173-245-62-90.cloudflare.comIn scope2026-11-14
cf-173-245-62-91.cloudflare.comIn scope2026-11-14
cf-173-245-62-92.cloudflare.comIn scope2026-11-14
cf-173-245-62-93.cloudflare.comIn scope2026-11-14
cf-173-245-62-94.cloudflare.comIn scope2026-11-14
cf-173-245-62-95.cloudflare.comIn scope2026-11-14
cf-173-245-62-96.cloudflare.comIn scope2026-11-14
cf-173-245-62-97.cloudflare.comIn scope2026-11-14
cf-173-245-62-98.cloudflare.comIn scope2026-11-14
cf-173-245-62-99.cloudflare.comIn scope2026-11-14
cf-190-131.cloudflare.comIn scope2026-11-14
cf-190-93-240-10.cloudflare.comIn scope2026-11-14
cf-190-93-240-100.cloudflare.comIn scope2026-11-14
cf-190-93-240-101.cloudflare.comIn scope2026-11-14
cf-190-93-240-102.cloudflare.comIn scope2026-11-14
cf-190-93-240-103.cloudflare.comIn scope2026-11-14
cf-190-93-240-104.cloudflare.comIn scope2026-11-14
cf-190-93-240-105.cloudflare.comIn scope2026-11-14
cf-190-93-240-106.cloudflare.comIn scope2026-11-14
cf-190-93-240-107.cloudflare.comIn scope2026-11-14
cf-190-93-240-108.cloudflare.comIn scope2026-11-14
cf-190-93-240-109.cloudflare.comIn scope2026-11-14
cf-190-93-240-11.cloudflare.comIn scope2026-11-14
cf-190-93-240-110.cloudflare.comIn scope2026-11-14
cf-190-93-240-111.cloudflare.comIn scope2026-11-14
cf-190-93-240-112.cloudflare.comIn scope2026-11-14
cf-190-93-240-113.cloudflare.comIn scope2026-11-14
cf-190-93-240-114.cloudflare.comIn scope2026-11-14
cf-190-93-240-115.cloudflare.comIn scope2026-11-14
cf-190-93-240-116.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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