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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 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 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-173-245-52-222.cloudflare.comIn scope2026-11-14
cf-173-245-52-223.cloudflare.comIn scope2026-11-14
cf-173-245-52-224.cloudflare.comIn scope2026-11-14
cf-173-245-52-225.cloudflare.comIn scope2026-11-14
cf-173-245-52-226.cloudflare.comIn scope2026-11-14
cf-173-245-52-227.cloudflare.comIn scope2026-11-14
cf-173-245-52-228.cloudflare.comIn scope2026-11-14
cf-173-245-52-229.cloudflare.comIn scope2026-11-14
cf-173-245-52-23.cloudflare.comIn scope2026-11-14
cf-173-245-52-230.cloudflare.comIn scope2026-11-14
cf-173-245-52-231.cloudflare.comIn scope2026-11-14
cf-173-245-52-232.cloudflare.comIn scope2026-11-14
cf-173-245-52-233.cloudflare.comIn scope2026-11-14
cf-173-245-52-234.cloudflare.comIn scope2026-11-14
cf-173-245-52-235.cloudflare.comIn scope2026-11-14
cf-173-245-52-236.cloudflare.comIn scope2026-11-14
cf-173-245-52-237.cloudflare.comIn scope2026-11-14
cf-173-245-52-238.cloudflare.comIn scope2026-11-14
cf-173-245-52-239.cloudflare.comIn scope2026-11-14
cf-173-245-52-240.cloudflare.comIn scope2026-11-14
cf-173-245-52-241.cloudflare.comIn scope2026-11-14
cf-173-245-52-242.cloudflare.comIn scope2026-11-14
cf-173-245-52-243.cloudflare.comIn scope2026-11-14
cf-173-245-52-244.cloudflare.comIn scope2026-11-14
cf-173-245-52-245.cloudflare.comIn scope2026-11-14
cf-173-245-52-246.cloudflare.comIn scope2026-11-14
cf-173-245-52-247.cloudflare.comIn scope2026-11-14
cf-173-245-52-248.cloudflare.comIn scope2026-11-14
cf-173-245-52-249.cloudflare.comIn scope2026-11-14
cf-173-245-52-250.cloudflare.comIn scope2026-11-14
cf-173-245-52-60.cloudflare.comIn scope2026-11-14
cf-173-245-52-61.cloudflare.comIn scope2026-11-14
cf-173-245-52-62.cloudflare.comIn scope2026-11-14
cf-173-245-52-63.cloudflare.comIn scope2026-11-14
cf-173-245-52-64.cloudflare.comIn scope2026-11-14
cf-173-245-52-65.cloudflare.comIn scope2026-11-14
cf-173-245-52-66.cloudflare.comIn scope2026-11-14
cf-173-245-52-67.cloudflare.comIn scope2026-11-14
cf-173-245-52-68.cloudflare.comIn scope2026-11-14
cf-173-245-52-69.cloudflare.comIn scope2026-11-14
cf-173-245-52-70.cloudflare.comIn scope2026-11-14
cf-173-245-52-71.cloudflare.comIn scope2026-11-14
cf-173-245-52-72.cloudflare.comIn scope2026-11-14
cf-173-245-52-73.cloudflare.comIn scope2026-11-14
cf-173-245-52-74.cloudflare.comIn scope2026-11-14
cf-173-245-52-75.cloudflare.comIn scope2026-11-14
cf-173-245-52-76.cloudflare.comIn scope2026-11-14
cf-173-245-52-77.cloudflare.comIn scope2026-11-14
cf-173-245-52-78.cloudflare.comIn scope2026-11-14
cf-173-245-52-79.cloudflare.comIn scope2026-11-14
cf-173-245-52-80.cloudflare.comIn scope2026-11-14
cf-173-245-52-81.cloudflare.comIn scope2026-11-14
cf-173-245-52-82.cloudflare.comIn scope2026-11-14
cf-173-245-52-83.cloudflare.comIn scope2026-11-14
cf-173-245-52-84.cloudflare.comIn scope2026-11-14
cf-173-245-52-85.cloudflare.comIn scope2026-11-14
cf-173-245-52-86.cloudflare.comIn scope2026-11-14
cf-173-245-52-87.cloudflare.comIn scope2026-11-14
cf-173-245-52-88.cloudflare.comIn scope2026-11-14
cf-173-245-52-89.cloudflare.comIn scope2026-11-14
cf-173-245-52-90.cloudflare.comIn scope2026-11-14
cf-173-245-52-91.cloudflare.comIn scope2026-11-14
cf-173-245-52-92.cloudflare.comIn scope2026-11-14
cf-173-245-52-93.cloudflare.comIn scope2026-11-14
cf-173-245-52-94.cloudflare.comIn scope2026-11-14
cf-173-245-52-95.cloudflare.comIn scope2026-11-14
cf-173-245-52-96.cloudflare.comIn scope2026-11-14
cf-173-245-52-97.cloudflare.comIn scope2026-11-14
cf-173-245-52-98.cloudflare.comIn scope2026-11-14
cf-173-245-52-99.cloudflare.comIn scope2026-11-14
cf-173-245-53-100.cloudflare.comIn scope2026-11-14
cf-173-245-53-101.cloudflare.comIn scope2026-11-14
cf-173-245-53-102.cloudflare.comIn scope2026-11-14
cf-173-245-53-103.cloudflare.comIn scope2026-11-14
cf-173-245-53-104.cloudflare.comIn scope2026-11-14
cf-173-245-53-105.cloudflare.comIn scope2026-11-14
cf-173-245-53-106.cloudflare.comIn scope2026-11-14
cf-173-245-53-107.cloudflare.comIn scope2026-11-14
cf-173-245-53-108.cloudflare.comIn scope2026-11-14
cf-173-245-53-109.cloudflare.comIn scope2026-11-14
cf-173-245-53-11.cloudflare.comIn scope2026-11-14
cf-173-245-53-110.cloudflare.comIn scope2026-11-14
cf-173-245-53-111.cloudflare.comIn scope2026-11-14
cf-173-245-53-112.cloudflare.comIn scope2026-11-14
cf-173-245-53-113.cloudflare.comIn scope2026-11-14
cf-173-245-53-114.cloudflare.comIn scope2026-11-14
cf-173-245-53-115.cloudflare.comIn scope2026-11-14
cf-173-245-53-116.cloudflare.comIn scope2026-11-14
cf-173-245-53-117.cloudflare.comIn scope2026-11-14
cf-173-245-53-118.cloudflare.comIn scope2026-11-14
cf-173-245-53-119.cloudflare.comIn scope2026-11-14
cf-173-245-53-12.cloudflare.comIn scope2026-11-14
cf-173-245-53-120.cloudflare.comIn scope2026-11-14
cf-173-245-53-121.cloudflare.comIn scope2026-11-14
cf-173-245-53-122.cloudflare.comIn scope2026-11-14
cf-173-245-53-123.cloudflare.comIn scope2026-11-14
cf-173-245-53-124.cloudflare.comIn scope2026-11-14
cf-173-245-53-125.cloudflare.comIn scope2026-11-14
cf-173-245-53-126.cloudflare.comIn scope2026-11-14
cf-173-245-53-127.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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