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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() 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 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
cf-173-245-50-230.cloudflare.comIn scope2026-11-14
cf-173-245-50-231.cloudflare.comIn scope2026-11-14
cf-173-245-50-232.cloudflare.comIn scope2026-11-14
cf-173-245-50-233.cloudflare.comIn scope2026-11-14
cf-173-245-50-234.cloudflare.comIn scope2026-11-14
cf-173-245-50-235.cloudflare.comIn scope2026-11-14
cf-173-245-50-236.cloudflare.comIn scope2026-11-14
cf-173-245-50-237.cloudflare.comIn scope2026-11-14
cf-173-245-50-238.cloudflare.comIn scope2026-11-14
cf-173-245-50-239.cloudflare.comIn scope2026-11-14
cf-173-245-50-24.cloudflare.comIn scope2026-11-14
cf-173-245-50-240.cloudflare.comIn scope2026-11-14
cf-173-245-50-241.cloudflare.comIn scope2026-11-14
cf-173-245-50-242.cloudflare.comIn scope2026-11-14
cf-173-245-50-243.cloudflare.comIn scope2026-11-14
cf-173-245-50-244.cloudflare.comIn scope2026-11-14
cf-173-245-50-245.cloudflare.comIn scope2026-11-14
cf-173-245-50-246.cloudflare.comIn scope2026-11-14
cf-173-245-50-247.cloudflare.comIn scope2026-11-14
cf-173-245-50-248.cloudflare.comIn scope2026-11-14
cf-173-245-50-249.cloudflare.comIn scope2026-11-14
cf-173-245-50-25.cloudflare.comIn scope2026-11-14
cf-173-245-50-250.cloudflare.comIn scope2026-11-14
cf-173-245-50-26.cloudflare.comIn scope2026-11-14
cf-173-245-50-27.cloudflare.comIn scope2026-11-14
cf-173-245-50-28.cloudflare.comIn scope2026-11-14
cf-173-245-50-29.cloudflare.comIn scope2026-11-14
cf-173-245-50-60.cloudflare.comIn scope2026-11-14
cf-173-245-50-61.cloudflare.comIn scope2026-11-14
cf-173-245-50-62.cloudflare.comIn scope2026-11-14
cf-173-245-50-63.cloudflare.comIn scope2026-11-14
cf-173-245-50-64.cloudflare.comIn scope2026-11-14
cf-173-245-50-65.cloudflare.comIn scope2026-11-14
cf-173-245-50-66.cloudflare.comIn scope2026-11-14
cf-173-245-50-67.cloudflare.comIn scope2026-11-14
cf-173-245-50-68.cloudflare.comIn scope2026-11-14
cf-173-245-50-69.cloudflare.comIn scope2026-11-14
cf-173-245-50-70.cloudflare.comIn scope2026-11-14
cf-173-245-50-71.cloudflare.comIn scope2026-11-14
cf-173-245-50-72.cloudflare.comIn scope2026-11-14
cf-173-245-50-73.cloudflare.comIn scope2026-11-14
cf-173-245-50-74.cloudflare.comIn scope2026-11-14
cf-173-245-50-75.cloudflare.comIn scope2026-11-14
cf-173-245-50-76.cloudflare.comIn scope2026-11-14
cf-173-245-50-77.cloudflare.comIn scope2026-11-14
cf-173-245-50-78.cloudflare.comIn scope2026-11-14
cf-173-245-50-79.cloudflare.comIn scope2026-11-14
cf-173-245-50-80.cloudflare.comIn scope2026-11-14
cf-173-245-50-81.cloudflare.comIn scope2026-11-14
cf-173-245-50-82.cloudflare.comIn scope2026-11-14
cf-173-245-50-83.cloudflare.comIn scope2026-11-14
cf-173-245-50-84.cloudflare.comIn scope2026-11-14
cf-173-245-50-85.cloudflare.comIn scope2026-11-14
cf-173-245-50-86.cloudflare.comIn scope2026-11-14
cf-173-245-50-87.cloudflare.comIn scope2026-11-14
cf-173-245-50-88.cloudflare.comIn scope2026-11-14
cf-173-245-50-89.cloudflare.comIn scope2026-11-14
cf-173-245-50-90.cloudflare.comIn scope2026-11-14
cf-173-245-50-91.cloudflare.comIn scope2026-11-14
cf-173-245-50-92.cloudflare.comIn scope2026-11-14
cf-173-245-50-93.cloudflare.comIn scope2026-11-14
cf-173-245-50-94.cloudflare.comIn scope2026-11-14
cf-173-245-50-95.cloudflare.comIn scope2026-11-14
cf-173-245-50-96.cloudflare.comIn scope2026-11-14
cf-173-245-50-97.cloudflare.comIn scope2026-11-14
cf-173-245-50-98.cloudflare.comIn scope2026-11-14
cf-173-245-50-99.cloudflare.comIn scope2026-11-14
cf-173-245-51-100.cloudflare.comIn scope2026-11-14
cf-173-245-51-101.cloudflare.comIn scope2026-11-14
cf-173-245-51-102.cloudflare.comIn scope2026-11-14
cf-173-245-51-103.cloudflare.comIn scope2026-11-14
cf-173-245-51-104.cloudflare.comIn scope2026-11-14
cf-173-245-51-105.cloudflare.comIn scope2026-11-14
cf-173-245-51-106.cloudflare.comIn scope2026-11-14
cf-173-245-51-107.cloudflare.comIn scope2026-11-14
cf-173-245-51-108.cloudflare.comIn scope2026-11-14
cf-173-245-51-109.cloudflare.comIn scope2026-11-14
cf-173-245-51-11.cloudflare.comIn scope2026-11-14
cf-173-245-51-110.cloudflare.comIn scope2026-11-14
cf-173-245-51-111.cloudflare.comIn scope2026-11-14
cf-173-245-51-112.cloudflare.comIn scope2026-11-14
cf-173-245-51-113.cloudflare.comIn scope2026-11-14
cf-173-245-51-114.cloudflare.comIn scope2026-11-14
cf-173-245-51-115.cloudflare.comIn scope2026-11-14
cf-173-245-51-116.cloudflare.comIn scope2026-11-14
cf-173-245-51-117.cloudflare.comIn scope2026-11-14
cf-173-245-51-118.cloudflare.comIn scope2026-11-14
cf-173-245-51-119.cloudflare.comIn scope2026-11-14
cf-173-245-51-12.cloudflare.comIn scope2026-11-14
cf-173-245-51-120.cloudflare.comIn scope2026-11-14
cf-173-245-51-121.cloudflare.comIn scope2026-11-14
cf-173-245-51-122.cloudflare.comIn scope2026-11-14
cf-173-245-51-123.cloudflare.comIn scope2026-11-14
cf-173-245-51-124.cloudflare.comIn scope2026-11-14
cf-173-245-51-125.cloudflare.comIn scope2026-11-14
cf-173-245-51-126.cloudflare.comIn scope2026-11-14
cf-173-245-51-127.cloudflare.comIn scope2026-11-14
cf-173-245-51-128.cloudflare.comIn scope2026-11-14
cf-173-245-51-129.cloudflare.comIn scope2026-11-14
cf-173-245-51-13.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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