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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-190-93-254-104.cloudflare.comIn scope2026-11-14
cf-190-93-254-105.cloudflare.comIn scope2026-11-14
cf-190-93-254-106.cloudflare.comIn scope2026-11-14
cf-190-93-254-107.cloudflare.comIn scope2026-11-14
cf-190-93-254-108.cloudflare.comIn scope2026-11-14
cf-190-93-254-109.cloudflare.comIn scope2026-11-14
cf-190-93-254-11.cloudflare.comIn scope2026-11-14
cf-190-93-254-110.cloudflare.comIn scope2026-11-14
cf-190-93-254-111.cloudflare.comIn scope2026-11-14
cf-190-93-254-112.cloudflare.comIn scope2026-11-14
cf-190-93-254-113.cloudflare.comIn scope2026-11-14
cf-190-93-254-114.cloudflare.comIn scope2026-11-14
cf-190-93-254-115.cloudflare.comIn scope2026-11-14
cf-190-93-254-116.cloudflare.comIn scope2026-11-14
cf-190-93-254-117.cloudflare.comIn scope2026-11-14
cf-190-93-254-118.cloudflare.comIn scope2026-11-14
cf-190-93-254-119.cloudflare.comIn scope2026-11-14
cf-190-93-254-12.cloudflare.comIn scope2026-11-14
cf-190-93-254-120.cloudflare.comIn scope2026-11-14
cf-190-93-254-121.cloudflare.comIn scope2026-11-14
cf-190-93-254-122.cloudflare.comIn scope2026-11-14
cf-190-93-254-123.cloudflare.comIn scope2026-11-14
cf-190-93-254-124.cloudflare.comIn scope2026-11-14
cf-190-93-254-125.cloudflare.comIn scope2026-11-14
cf-190-93-254-126.cloudflare.comIn scope2026-11-14
cf-190-93-254-127.cloudflare.comIn scope2026-11-14
cf-190-93-254-128.cloudflare.comIn scope2026-11-14
cf-190-93-254-129.cloudflare.comIn scope2026-11-14
cf-190-93-254-13.cloudflare.comIn scope2026-11-14
cf-190-93-254-130.cloudflare.comIn scope2026-11-14
cf-190-93-254-131.cloudflare.comIn scope2026-11-14
cf-190-93-254-132.cloudflare.comIn scope2026-11-14
cf-190-93-254-133.cloudflare.comIn scope2026-11-14
cf-190-93-254-134.cloudflare.comIn scope2026-11-14
cf-190-93-254-135.cloudflare.comIn scope2026-11-14
cf-190-93-254-136.cloudflare.comIn scope2026-11-14
cf-190-93-254-137.cloudflare.comIn scope2026-11-14
cf-190-93-254-138.cloudflare.comIn scope2026-11-14
cf-190-93-254-139.cloudflare.comIn scope2026-11-14
cf-190-93-254-14.cloudflare.comIn scope2026-11-14
cf-190-93-254-140.cloudflare.comIn scope2026-11-14
cf-190-93-254-141.cloudflare.comIn scope2026-11-14
cf-190-93-254-142.cloudflare.comIn scope2026-11-14
cf-190-93-254-143.cloudflare.comIn scope2026-11-14
cf-190-93-254-144.cloudflare.comIn scope2026-11-14
cf-190-93-254-145.cloudflare.comIn scope2026-11-14
cf-190-93-254-146.cloudflare.comIn scope2026-11-14
cf-190-93-254-147.cloudflare.comIn scope2026-11-14
cf-190-93-254-148.cloudflare.comIn scope2026-11-14
cf-190-93-254-149.cloudflare.comIn scope2026-11-14
cf-190-93-254-15.cloudflare.comIn scope2026-11-14
cf-190-93-254-150.cloudflare.comIn scope2026-11-14
cf-190-93-254-151.cloudflare.comIn scope2026-11-14
cf-190-93-254-152.cloudflare.comIn scope2026-11-14
cf-190-93-254-153.cloudflare.comIn scope2026-11-14
cf-190-93-254-154.cloudflare.comIn scope2026-11-14
cf-190-93-254-155.cloudflare.comIn scope2026-11-14
cf-190-93-254-156.cloudflare.comIn scope2026-11-14
cf-190-93-254-157.cloudflare.comIn scope2026-11-14
cf-190-93-254-158.cloudflare.comIn scope2026-11-14
cf-190-93-254-159.cloudflare.comIn scope2026-11-14
cf-190-93-254-16.cloudflare.comIn scope2026-11-14
cf-190-93-254-160.cloudflare.comIn scope2026-11-14
cf-190-93-254-161.cloudflare.comIn scope2026-11-14
cf-190-93-254-162.cloudflare.comIn scope2026-11-14
cf-190-93-254-163.cloudflare.comIn scope2026-11-14
cf-190-93-254-164.cloudflare.comIn scope2026-11-14
cf-190-93-254-165.cloudflare.comIn scope2026-11-14
cf-190-93-254-166.cloudflare.comIn scope2026-11-14
cf-190-93-254-167.cloudflare.comIn scope2026-11-14
cf-190-93-254-168.cloudflare.comIn scope2026-11-14
cf-190-93-254-169.cloudflare.comIn scope2026-11-14
cf-190-93-254-17.cloudflare.comIn scope2026-11-14
cf-190-93-254-170.cloudflare.comIn scope2026-11-14
cf-190-93-254-171.cloudflare.comIn scope2026-11-14
cf-190-93-254-172.cloudflare.comIn scope2026-11-14
cf-190-93-254-173.cloudflare.comIn scope2026-11-14
cf-190-93-254-174.cloudflare.comIn scope2026-11-14
cf-190-93-254-175.cloudflare.comIn scope2026-11-14
cf-190-93-254-176.cloudflare.comIn scope2026-11-14
cf-190-93-254-177.cloudflare.comIn scope2026-11-14
cf-190-93-254-178.cloudflare.comIn scope2026-11-14
cf-190-93-254-179.cloudflare.comIn scope2026-11-14
cf-190-93-254-18.cloudflare.comIn scope2026-11-14
cf-190-93-254-180.cloudflare.comIn scope2026-11-14
cf-190-93-254-181.cloudflare.comIn scope2026-11-14
cf-190-93-254-182.cloudflare.comIn scope2026-11-14
cf-190-93-254-183.cloudflare.comIn scope2026-11-14
cf-190-93-254-184.cloudflare.comIn scope2026-11-14
cf-190-93-254-185.cloudflare.comIn scope2026-11-14
cf-190-93-254-186.cloudflare.comIn scope2026-11-14
cf-190-93-254-187.cloudflare.comIn scope2026-11-14
cf-190-93-254-188.cloudflare.comIn scope2026-11-14
cf-190-93-254-189.cloudflare.comIn scope2026-11-14
cf-190-93-254-19.cloudflare.comIn scope2026-11-14
cf-190-93-254-190.cloudflare.comIn scope2026-11-14
cf-190-93-254-191.cloudflare.comIn scope2026-11-14
cf-190-93-254-192.cloudflare.comIn scope2026-11-14
cf-190-93-254-193.cloudflare.comIn scope2026-11-14
cf-190-93-254-194.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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