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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-190-93-248-63.cloudflare.comIn scope2026-11-14
cf-190-93-248-64.cloudflare.comIn scope2026-11-14
cf-190-93-248-65.cloudflare.comIn scope2026-11-14
cf-190-93-248-66.cloudflare.comIn scope2026-11-14
cf-190-93-248-67.cloudflare.comIn scope2026-11-14
cf-190-93-248-68.cloudflare.comIn scope2026-11-14
cf-190-93-248-69.cloudflare.comIn scope2026-11-14
cf-190-93-248-7.cloudflare.comIn scope2026-11-14
cf-190-93-248-70.cloudflare.comIn scope2026-11-14
cf-190-93-248-71.cloudflare.comIn scope2026-11-14
cf-190-93-248-72.cloudflare.comIn scope2026-11-14
cf-190-93-248-73.cloudflare.comIn scope2026-11-14
cf-190-93-248-74.cloudflare.comIn scope2026-11-14
cf-190-93-248-75.cloudflare.comIn scope2026-11-14
cf-190-93-248-76.cloudflare.comIn scope2026-11-14
cf-190-93-248-77.cloudflare.comIn scope2026-11-14
cf-190-93-248-78.cloudflare.comIn scope2026-11-14
cf-190-93-248-79.cloudflare.comIn scope2026-11-14
cf-190-93-248-8.cloudflare.comIn scope2026-11-14
cf-190-93-248-80.cloudflare.comIn scope2026-11-14
cf-190-93-248-81.cloudflare.comIn scope2026-11-14
cf-190-93-248-82.cloudflare.comIn scope2026-11-14
cf-190-93-248-83.cloudflare.comIn scope2026-11-14
cf-190-93-248-84.cloudflare.comIn scope2026-11-14
cf-190-93-248-85.cloudflare.comIn scope2026-11-14
cf-190-93-248-86.cloudflare.comIn scope2026-11-14
cf-190-93-248-87.cloudflare.comIn scope2026-11-14
cf-190-93-248-88.cloudflare.comIn scope2026-11-14
cf-190-93-248-89.cloudflare.comIn scope2026-11-14
cf-190-93-248-9.cloudflare.comIn scope2026-11-14
cf-190-93-248-90.cloudflare.comIn scope2026-11-14
cf-190-93-248-91.cloudflare.comIn scope2026-11-14
cf-190-93-248-92.cloudflare.comIn scope2026-11-14
cf-190-93-248-93.cloudflare.comIn scope2026-11-14
cf-190-93-248-94.cloudflare.comIn scope2026-11-14
cf-190-93-248-95.cloudflare.comIn scope2026-11-14
cf-190-93-248-96.cloudflare.comIn scope2026-11-14
cf-190-93-248-97.cloudflare.comIn scope2026-11-14
cf-190-93-248-98.cloudflare.comIn scope2026-11-14
cf-190-93-248-99.cloudflare.comIn scope2026-11-14
cf-190-93-249-10.cloudflare.comIn scope2026-11-14
cf-190-93-249-100.cloudflare.comIn scope2026-11-14
cf-190-93-249-101.cloudflare.comIn scope2026-11-14
cf-190-93-249-102.cloudflare.comIn scope2026-11-14
cf-190-93-249-103.cloudflare.comIn scope2026-11-14
cf-190-93-249-104.cloudflare.comIn scope2026-11-14
cf-190-93-249-105.cloudflare.comIn scope2026-11-14
cf-190-93-249-106.cloudflare.comIn scope2026-11-14
cf-190-93-249-107.cloudflare.comIn scope2026-11-14
cf-190-93-249-108.cloudflare.comIn scope2026-11-14
cf-190-93-249-109.cloudflare.comIn scope2026-11-14
cf-190-93-249-11.cloudflare.comIn scope2026-11-14
cf-190-93-249-110.cloudflare.comIn scope2026-11-14
cf-190-93-249-111.cloudflare.comIn scope2026-11-14
cf-190-93-249-112.cloudflare.comIn scope2026-11-14
cf-190-93-249-113.cloudflare.comIn scope2026-11-14
cf-190-93-249-114.cloudflare.comIn scope2026-11-14
cf-190-93-249-115.cloudflare.comIn scope2026-11-14
cf-190-93-249-116.cloudflare.comIn scope2026-11-14
cf-190-93-249-117.cloudflare.comIn scope2026-11-14
cf-190-93-249-118.cloudflare.comIn scope2026-11-14
cf-190-93-249-119.cloudflare.comIn scope2026-11-14
cf-190-93-249-12.cloudflare.comIn scope2026-11-14
cf-190-93-249-120.cloudflare.comIn scope2026-11-14
cf-190-93-249-121.cloudflare.comIn scope2026-11-14
cf-190-93-249-122.cloudflare.comIn scope2026-11-14
cf-190-93-249-123.cloudflare.comIn scope2026-11-14
cf-190-93-249-124.cloudflare.comIn scope2026-11-14
cf-190-93-249-125.cloudflare.comIn scope2026-11-14
cf-190-93-249-126.cloudflare.comIn scope2026-11-14
cf-190-93-249-127.cloudflare.comIn scope2026-11-14
cf-190-93-249-128.cloudflare.comIn scope2026-11-14
cf-190-93-249-129.cloudflare.comIn scope2026-11-14
cf-190-93-249-13.cloudflare.comIn scope2026-11-14
cf-190-93-249-130.cloudflare.comIn scope2026-11-14
cf-190-93-249-131.cloudflare.comIn scope2026-11-14
cf-190-93-249-132.cloudflare.comIn scope2026-11-14
cf-190-93-249-133.cloudflare.comIn scope2026-11-14
cf-190-93-249-134.cloudflare.comIn scope2026-11-14
cf-190-93-249-135.cloudflare.comIn scope2026-11-14
cf-190-93-249-136.cloudflare.comIn scope2026-11-14
cf-190-93-249-137.cloudflare.comIn scope2026-11-14
cf-190-93-249-138.cloudflare.comIn scope2026-11-14
cf-190-93-249-139.cloudflare.comIn scope2026-11-14
cf-190-93-249-14.cloudflare.comIn scope2026-11-14
cf-190-93-249-140.cloudflare.comIn scope2026-11-14
cf-190-93-249-141.cloudflare.comIn scope2026-11-14
cf-190-93-249-142.cloudflare.comIn scope2026-11-14
cf-190-93-249-143.cloudflare.comIn scope2026-11-14
cf-190-93-249-144.cloudflare.comIn scope2026-11-14
cf-190-93-249-145.cloudflare.comIn scope2026-11-14
cf-190-93-249-146.cloudflare.comIn scope2026-11-14
cf-190-93-249-147.cloudflare.comIn scope2026-11-14
cf-190-93-249-148.cloudflare.comIn scope2026-11-14
cf-190-93-249-149.cloudflare.comIn scope2026-11-14
cf-190-93-249-15.cloudflare.comIn scope2026-11-14
cf-190-93-249-150.cloudflare.comIn scope2026-11-14
cf-190-93-249-151.cloudflare.comIn scope2026-11-14
cf-190-93-249-152.cloudflare.comIn scope2026-11-14
cf-190-93-249-153.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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