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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:cloudflare.com
Scope
Name suggests
First seen
Text fileClear filters18,951 names
Subdomains of Cloudflare Public Bug Bounty
NameScopeFirst seen
cf-173-245-53-22.cloudflare.comIn scope2026-11-14
cf-173-245-53-220.cloudflare.comIn scope2026-11-14
cf-173-245-53-221.cloudflare.comIn scope2026-11-14
cf-173-245-53-222.cloudflare.comIn scope2026-11-14
cf-173-245-53-223.cloudflare.comIn scope2026-11-14
cf-173-245-53-224.cloudflare.comIn scope2026-11-14
cf-173-245-53-225.cloudflare.comIn scope2026-11-14
cf-173-245-53-226.cloudflare.comIn scope2026-11-14
cf-173-245-53-227.cloudflare.comIn scope2026-11-14
cf-173-245-53-228.cloudflare.comIn scope2026-11-14
cf-173-245-53-229.cloudflare.comIn scope2026-11-14
cf-173-245-53-23.cloudflare.comIn scope2026-11-14
cf-173-245-53-230.cloudflare.comIn scope2026-11-14
cf-173-245-53-231.cloudflare.comIn scope2026-11-14
cf-173-245-53-232.cloudflare.comIn scope2026-11-14
cf-173-245-53-233.cloudflare.comIn scope2026-11-14
cf-173-245-53-234.cloudflare.comIn scope2026-11-14
cf-173-245-53-235.cloudflare.comIn scope2026-11-14
cf-173-245-53-236.cloudflare.comIn scope2026-11-14
cf-173-245-53-237.cloudflare.comIn scope2026-11-14
cf-173-245-53-238.cloudflare.comIn scope2026-11-14
cf-173-245-53-239.cloudflare.comIn scope2026-11-14
cf-173-245-53-24.cloudflare.comIn scope2026-11-14
cf-173-245-53-240.cloudflare.comIn scope2026-11-14
cf-173-245-53-241.cloudflare.comIn scope2026-11-14
cf-173-245-53-242.cloudflare.comIn scope2026-11-14
cf-173-245-53-243.cloudflare.comIn scope2026-11-14
cf-173-245-53-244.cloudflare.comIn scope2026-11-14
cf-173-245-53-245.cloudflare.comIn scope2026-11-14
cf-173-245-53-246.cloudflare.comIn scope2026-11-14
cf-173-245-53-247.cloudflare.comIn scope2026-11-14
cf-173-245-53-248.cloudflare.comIn scope2026-11-14
cf-173-245-53-249.cloudflare.comIn scope2026-11-14
cf-173-245-53-25.cloudflare.comIn scope2026-11-14
cf-173-245-53-250.cloudflare.comIn scope2026-11-14
cf-173-245-53-26.cloudflare.comIn scope2026-11-14
cf-173-245-53-27.cloudflare.comIn scope2026-11-14
cf-173-245-53-28.cloudflare.comIn scope2026-11-14
cf-173-245-53-29.cloudflare.comIn scope2026-11-14
cf-173-245-53-60.cloudflare.comIn scope2026-11-14
cf-173-245-53-61.cloudflare.comIn scope2026-11-14
cf-173-245-53-62.cloudflare.comIn scope2026-11-14
cf-173-245-53-63.cloudflare.comIn scope2026-11-14
cf-173-245-53-64.cloudflare.comIn scope2026-11-14
cf-173-245-53-65.cloudflare.comIn scope2026-11-14
cf-173-245-53-66.cloudflare.comIn scope2026-11-14
cf-173-245-53-67.cloudflare.comIn scope2026-11-14
cf-173-245-53-68.cloudflare.comIn scope2026-11-14
cf-173-245-53-69.cloudflare.comIn scope2026-11-14
cf-173-245-53-70.cloudflare.comIn scope2026-11-14
cf-173-245-53-71.cloudflare.comIn scope2026-11-14
cf-173-245-53-72.cloudflare.comIn scope2026-11-14
cf-173-245-53-73.cloudflare.comIn scope2026-11-14
cf-173-245-53-74.cloudflare.comIn scope2026-11-14
cf-173-245-53-75.cloudflare.comIn scope2026-11-14
cf-173-245-53-76.cloudflare.comIn scope2026-11-14
cf-173-245-53-77.cloudflare.comIn scope2026-11-14
cf-173-245-53-78.cloudflare.comIn scope2026-11-14
cf-173-245-53-79.cloudflare.comIn scope2026-11-14
cf-173-245-53-80.cloudflare.comIn scope2026-11-14
cf-173-245-53-81.cloudflare.comIn scope2026-11-14
cf-173-245-53-82.cloudflare.comIn scope2026-11-14
cf-173-245-53-83.cloudflare.comIn scope2026-11-14
cf-173-245-53-84.cloudflare.comIn scope2026-11-14
cf-173-245-53-85.cloudflare.comIn scope2026-11-14
cf-173-245-53-86.cloudflare.comIn scope2026-11-14
cf-173-245-53-87.cloudflare.comIn scope2026-11-14
cf-173-245-53-88.cloudflare.comIn scope2026-11-14
cf-173-245-53-89.cloudflare.comIn scope2026-11-14
cf-173-245-53-90.cloudflare.comIn scope2026-11-14
cf-173-245-53-91.cloudflare.comIn scope2026-11-14
cf-173-245-53-92.cloudflare.comIn scope2026-11-14
cf-173-245-53-93.cloudflare.comIn scope2026-11-14
cf-173-245-53-94.cloudflare.comIn scope2026-11-14
cf-173-245-53-95.cloudflare.comIn scope2026-11-14
cf-173-245-53-96.cloudflare.comIn scope2026-11-14
cf-173-245-53-97.cloudflare.comIn scope2026-11-14
cf-173-245-53-98.cloudflare.comIn scope2026-11-14
cf-173-245-53-99.cloudflare.comIn scope2026-11-14
cf-173-245-55-100.cloudflare.comIn scope2026-11-14
cf-173-245-55-101.cloudflare.comIn scope2026-11-14
cf-173-245-55-102.cloudflare.comIn scope2026-11-14
cf-173-245-55-103.cloudflare.comIn scope2026-11-14
cf-173-245-55-104.cloudflare.comIn scope2026-11-14
cf-173-245-55-105.cloudflare.comIn scope2026-11-14
cf-173-245-55-106.cloudflare.comIn scope2026-11-14
cf-173-245-55-107.cloudflare.comIn scope2026-11-14
cf-173-245-55-108.cloudflare.comIn scope2026-11-14
cf-173-245-55-109.cloudflare.comIn scope2026-11-14
cf-173-245-55-11.cloudflare.comIn scope2026-11-14
cf-173-245-55-110.cloudflare.comIn scope2026-11-14
cf-173-245-55-111.cloudflare.comIn scope2026-11-14
cf-173-245-55-112.cloudflare.comIn scope2026-11-14
cf-173-245-55-113.cloudflare.comIn scope2026-11-14
cf-173-245-55-114.cloudflare.comIn scope2026-11-14
cf-173-245-55-115.cloudflare.comIn scope2026-11-14
cf-173-245-55-116.cloudflare.comIn scope2026-11-14
cf-173-245-55-117.cloudflare.comIn scope2026-11-14
cf-173-245-55-118.cloudflare.comIn scope2026-11-14
cf-173-245-55-119.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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Updated