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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 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
cf-173-245-49-234.cloudflare.comIn scope2026-11-14
cf-173-245-49-235.cloudflare.comIn scope2026-11-14
cf-173-245-49-236.cloudflare.comIn scope2026-11-14
cf-173-245-49-237.cloudflare.comIn scope2026-11-14
cf-173-245-49-238.cloudflare.comIn scope2026-11-14
cf-173-245-49-239.cloudflare.comIn scope2026-11-14
cf-173-245-49-240.cloudflare.comIn scope2026-11-14
cf-173-245-49-241.cloudflare.comIn scope2026-11-14
cf-173-245-49-242.cloudflare.comIn scope2026-11-14
cf-173-245-49-243.cloudflare.comIn scope2026-11-14
cf-173-245-49-244.cloudflare.comIn scope2026-11-14
cf-173-245-49-245.cloudflare.comIn scope2026-11-14
cf-173-245-49-246.cloudflare.comIn scope2026-11-14
cf-173-245-49-247.cloudflare.comIn scope2026-11-14
cf-173-245-49-248.cloudflare.comIn scope2026-11-14
cf-173-245-49-249.cloudflare.comIn scope2026-11-14
cf-173-245-49-250.cloudflare.comIn scope2026-11-14
cf-173-245-49-60.cloudflare.comIn scope2026-11-14
cf-173-245-49-61.cloudflare.comIn scope2026-11-14
cf-173-245-49-62.cloudflare.comIn scope2026-11-14
cf-173-245-49-63.cloudflare.comIn scope2026-11-14
cf-173-245-49-64.cloudflare.comIn scope2026-11-14
cf-173-245-49-65.cloudflare.comIn scope2026-11-14
cf-173-245-49-66.cloudflare.comIn scope2026-11-14
cf-173-245-49-67.cloudflare.comIn scope2026-11-14
cf-173-245-49-68.cloudflare.comIn scope2026-11-14
cf-173-245-49-69.cloudflare.comIn scope2026-11-14
cf-173-245-49-70.cloudflare.comIn scope2026-11-14
cf-173-245-49-71.cloudflare.comIn scope2026-11-14
cf-173-245-49-72.cloudflare.comIn scope2026-11-14
cf-173-245-49-73.cloudflare.comIn scope2026-11-14
cf-173-245-49-74.cloudflare.comIn scope2026-11-14
cf-173-245-49-75.cloudflare.comIn scope2026-11-14
cf-173-245-49-76.cloudflare.comIn scope2026-11-14
cf-173-245-49-77.cloudflare.comIn scope2026-11-14
cf-173-245-49-78.cloudflare.comIn scope2026-11-14
cf-173-245-49-79.cloudflare.comIn scope2026-11-14
cf-173-245-49-80.cloudflare.comIn scope2026-11-14
cf-173-245-49-81.cloudflare.comIn scope2026-11-14
cf-173-245-49-82.cloudflare.comIn scope2026-11-14
cf-173-245-49-83.cloudflare.comIn scope2026-11-14
cf-173-245-49-84.cloudflare.comIn scope2026-11-14
cf-173-245-49-85.cloudflare.comIn scope2026-11-14
cf-173-245-49-86.cloudflare.comIn scope2026-11-14
cf-173-245-49-87.cloudflare.comIn scope2026-11-14
cf-173-245-49-88.cloudflare.comIn scope2026-11-14
cf-173-245-49-89.cloudflare.comIn scope2026-11-14
cf-173-245-49-90.cloudflare.comIn scope2026-11-14
cf-173-245-49-91.cloudflare.comIn scope2026-11-14
cf-173-245-49-92.cloudflare.comIn scope2026-11-14
cf-173-245-49-93.cloudflare.comIn scope2026-11-14
cf-173-245-49-94.cloudflare.comIn scope2026-11-14
cf-173-245-49-95.cloudflare.comIn scope2026-11-14
cf-173-245-49-96.cloudflare.comIn scope2026-11-14
cf-173-245-49-97.cloudflare.comIn scope2026-11-14
cf-173-245-49-98.cloudflare.comIn scope2026-11-14
cf-173-245-49-99.cloudflare.comIn scope2026-11-14
cf-173-245-50-100.cloudflare.comIn scope2026-11-14
cf-173-245-50-101.cloudflare.comIn scope2026-11-14
cf-173-245-50-102.cloudflare.comIn scope2026-11-14
cf-173-245-50-103.cloudflare.comIn scope2026-11-14
cf-173-245-50-104.cloudflare.comIn scope2026-11-14
cf-173-245-50-105.cloudflare.comIn scope2026-11-14
cf-173-245-50-106.cloudflare.comIn scope2026-11-14
cf-173-245-50-107.cloudflare.comIn scope2026-11-14
cf-173-245-50-108.cloudflare.comIn scope2026-11-14
cf-173-245-50-109.cloudflare.comIn scope2026-11-14
cf-173-245-50-11.cloudflare.comIn scope2026-11-14
cf-173-245-50-110.cloudflare.comIn scope2026-11-14
cf-173-245-50-111.cloudflare.comIn scope2026-11-14
cf-173-245-50-112.cloudflare.comIn scope2026-11-14
cf-173-245-50-113.cloudflare.comIn scope2026-11-14
cf-173-245-50-114.cloudflare.comIn scope2026-11-14
cf-173-245-50-115.cloudflare.comIn scope2026-11-14
cf-173-245-50-116.cloudflare.comIn scope2026-11-14
cf-173-245-50-117.cloudflare.comIn scope2026-11-14
cf-173-245-50-118.cloudflare.comIn scope2026-11-14
cf-173-245-50-119.cloudflare.comIn scope2026-11-14
cf-173-245-50-12.cloudflare.comIn scope2026-11-14
cf-173-245-50-120.cloudflare.comIn scope2026-11-14
cf-173-245-50-121.cloudflare.comIn scope2026-11-14
cf-173-245-50-122.cloudflare.comIn scope2026-11-14
cf-173-245-50-123.cloudflare.comIn scope2026-11-14
cf-173-245-50-124.cloudflare.comIn scope2026-11-14
cf-173-245-50-125.cloudflare.comIn scope2026-11-14
cf-173-245-50-126.cloudflare.comIn scope2026-11-14
cf-173-245-50-127.cloudflare.comIn scope2026-11-14
cf-173-245-50-128.cloudflare.comIn scope2026-11-14
cf-173-245-50-129.cloudflare.comIn scope2026-11-14
cf-173-245-50-13.cloudflare.comIn scope2026-11-14
cf-173-245-50-130.cloudflare.comIn scope2026-11-14
cf-173-245-50-131.cloudflare.comIn scope2026-11-14
cf-173-245-50-132.cloudflare.comIn scope2026-11-14
cf-173-245-50-133.cloudflare.comIn scope2026-11-14
cf-173-245-50-134.cloudflare.comIn scope2026-11-14
cf-173-245-50-135.cloudflare.comIn scope2026-11-14
cf-173-245-50-136.cloudflare.comIn scope2026-11-14
cf-173-245-50-137.cloudflare.comIn scope2026-11-14
cf-173-245-50-138.cloudflare.comIn scope2026-11-14
cf-173-245-50-139.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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