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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-190-93-254-58.cloudflare.comIn scope2026-11-14
cf-190-93-254-59.cloudflare.comIn scope2026-11-14
cf-190-93-254-6.cloudflare.comIn scope2026-11-14
cf-190-93-254-60.cloudflare.comIn scope2026-11-14
cf-190-93-254-61.cloudflare.comIn scope2026-11-14
cf-190-93-254-62.cloudflare.comIn scope2026-11-14
cf-190-93-254-63.cloudflare.comIn scope2026-11-14
cf-190-93-254-64.cloudflare.comIn scope2026-11-14
cf-190-93-254-65.cloudflare.comIn scope2026-11-14
cf-190-93-254-66.cloudflare.comIn scope2026-11-14
cf-190-93-254-67.cloudflare.comIn scope2026-11-14
cf-190-93-254-68.cloudflare.comIn scope2026-11-14
cf-190-93-254-69.cloudflare.comIn scope2026-11-14
cf-190-93-254-7.cloudflare.comIn scope2026-11-14
cf-190-93-254-70.cloudflare.comIn scope2026-11-14
cf-190-93-254-71.cloudflare.comIn scope2026-11-14
cf-190-93-254-72.cloudflare.comIn scope2026-11-14
cf-190-93-254-73.cloudflare.comIn scope2026-11-14
cf-190-93-254-74.cloudflare.comIn scope2026-11-14
cf-190-93-254-75.cloudflare.comIn scope2026-11-14
cf-190-93-254-76.cloudflare.comIn scope2026-11-14
cf-190-93-254-77.cloudflare.comIn scope2026-11-14
cf-190-93-254-78.cloudflare.comIn scope2026-11-14
cf-190-93-254-79.cloudflare.comIn scope2026-11-14
cf-190-93-254-8.cloudflare.comIn scope2026-11-14
cf-190-93-254-80.cloudflare.comIn scope2026-11-14
cf-190-93-254-81.cloudflare.comIn scope2026-11-14
cf-190-93-254-82.cloudflare.comIn scope2026-11-14
cf-190-93-254-83.cloudflare.comIn scope2026-11-14
cf-190-93-254-84.cloudflare.comIn scope2026-11-14
cf-190-93-254-85.cloudflare.comIn scope2026-11-14
cf-190-93-254-86.cloudflare.comIn scope2026-11-14
cf-190-93-254-87.cloudflare.comIn scope2026-11-14
cf-190-93-254-88.cloudflare.comIn scope2026-11-14
cf-190-93-254-89.cloudflare.comIn scope2026-11-14
cf-190-93-254-9.cloudflare.comIn scope2026-11-14
cf-190-93-254-90.cloudflare.comIn scope2026-11-14
cf-190-93-254-91.cloudflare.comIn scope2026-11-14
cf-190-93-254-92.cloudflare.comIn scope2026-11-14
cf-190-93-254-93.cloudflare.comIn scope2026-11-14
cf-190-93-254-94.cloudflare.comIn scope2026-11-14
cf-190-93-254-95.cloudflare.comIn scope2026-11-14
cf-190-93-254-96.cloudflare.comIn scope2026-11-14
cf-190-93-254-97.cloudflare.comIn scope2026-11-14
cf-190-93-254-98.cloudflare.comIn scope2026-11-14
cf-190-93-254-99.cloudflare.comIn scope2026-11-14
cf-190-93-255-10.cloudflare.comIn scope2026-11-14
cf-190-93-255-100.cloudflare.comIn scope2026-11-14
cf-190-93-255-101.cloudflare.comIn scope2026-11-14
cf-190-93-255-102.cloudflare.comIn scope2026-11-14
cf-190-93-255-103.cloudflare.comIn scope2026-11-14
cf-190-93-255-104.cloudflare.comIn scope2026-11-14
cf-190-93-255-105.cloudflare.comIn scope2026-11-14
cf-190-93-255-106.cloudflare.comIn scope2026-11-14
cf-190-93-255-107.cloudflare.comIn scope2026-11-14
cf-190-93-255-108.cloudflare.comIn scope2026-11-14
cf-190-93-255-109.cloudflare.comIn scope2026-11-14
cf-190-93-255-11.cloudflare.comIn scope2026-11-14
cf-190-93-255-110.cloudflare.comIn scope2026-11-14
cf-190-93-255-111.cloudflare.comIn scope2026-11-14
cf-190-93-255-112.cloudflare.comIn scope2026-11-14
cf-190-93-255-113.cloudflare.comIn scope2026-11-14
cf-190-93-255-114.cloudflare.comIn scope2026-11-14
cf-190-93-255-115.cloudflare.comIn scope2026-11-14
cf-190-93-255-116.cloudflare.comIn scope2026-11-14
cf-190-93-255-117.cloudflare.comIn scope2026-11-14
cf-190-93-255-118.cloudflare.comIn scope2026-11-14
cf-190-93-255-119.cloudflare.comIn scope2026-11-14
cf-190-93-255-12.cloudflare.comIn scope2026-11-14
cf-190-93-255-120.cloudflare.comIn scope2026-11-14
cf-190-93-255-121.cloudflare.comIn scope2026-11-14
cf-190-93-255-122.cloudflare.comIn scope2026-11-14
cf-190-93-255-123.cloudflare.comIn scope2026-11-14
cf-190-93-255-124.cloudflare.comIn scope2026-11-14
cf-190-93-255-125.cloudflare.comIn scope2026-11-14
cf-190-93-255-126.cloudflare.comIn scope2026-11-14
cf-190-93-255-127.cloudflare.comIn scope2026-11-14
cf-190-93-255-128.cloudflare.comIn scope2026-11-14
cf-190-93-255-129.cloudflare.comIn scope2026-11-14
cf-190-93-255-13.cloudflare.comIn scope2026-11-14
cf-190-93-255-130.cloudflare.comIn scope2026-11-14
cf-190-93-255-131.cloudflare.comIn scope2026-11-14
cf-190-93-255-132.cloudflare.comIn scope2026-11-14
cf-190-93-255-133.cloudflare.comIn scope2026-11-14
cf-190-93-255-134.cloudflare.comIn scope2026-11-14
cf-190-93-255-135.cloudflare.comIn scope2026-11-14
cf-190-93-255-136.cloudflare.comIn scope2026-11-14
cf-190-93-255-137.cloudflare.comIn scope2026-11-14
cf-190-93-255-138.cloudflare.comIn scope2026-11-14
cf-190-93-255-139.cloudflare.comIn scope2026-11-14
cf-190-93-255-14.cloudflare.comIn scope2026-11-14
cf-190-93-255-140.cloudflare.comIn scope2026-11-14
cf-190-93-255-141.cloudflare.comIn scope2026-11-14
cf-190-93-255-142.cloudflare.comIn scope2026-11-14
cf-190-93-255-143.cloudflare.comIn scope2026-11-14
cf-190-93-255-144.cloudflare.comIn scope2026-11-14
cf-190-93-255-145.cloudflare.comIn scope2026-11-14
cf-190-93-255-146.cloudflare.comIn scope2026-11-14
cf-190-93-255-147.cloudflare.comIn scope2026-11-14
cf-190-93-255-148.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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