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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-199-27-128-94.cloudflare.comIn scope2026-11-14
cf-199-27-128-95.cloudflare.comIn scope2026-11-14
cf-199-27-128-96.cloudflare.comIn scope2026-11-14
cf-199-27-128-97.cloudflare.comIn scope2026-11-14
cf-199-27-128-98.cloudflare.comIn scope2026-11-14
cf-199-27-128-99.cloudflare.comIn scope2026-11-14
cf-199-27-134-100.cloudflare.comIn scope2026-11-14
cf-199-27-134-101.cloudflare.comIn scope2026-11-14
cf-199-27-134-102.cloudflare.comIn scope2026-11-14
cf-199-27-134-103.cloudflare.comIn scope2026-11-14
cf-199-27-134-104.cloudflare.comIn scope2026-11-14
cf-199-27-134-105.cloudflare.comIn scope2026-11-14
cf-199-27-134-106.cloudflare.comIn scope2026-11-14
cf-199-27-134-107.cloudflare.comIn scope2026-11-14
cf-199-27-134-108.cloudflare.comIn scope2026-11-14
cf-199-27-134-109.cloudflare.comIn scope2026-11-14
cf-199-27-134-110.cloudflare.comIn scope2026-11-14
cf-199-27-134-111.cloudflare.comIn scope2026-11-14
cf-199-27-134-112.cloudflare.comIn scope2026-11-14
cf-199-27-134-113.cloudflare.comIn scope2026-11-14
cf-199-27-134-114.cloudflare.comIn scope2026-11-14
cf-199-27-134-115.cloudflare.comIn scope2026-11-14
cf-199-27-134-116.cloudflare.comIn scope2026-11-14
cf-199-27-134-117.cloudflare.comIn scope2026-11-14
cf-199-27-134-118.cloudflare.comIn scope2026-11-14
cf-199-27-134-119.cloudflare.comIn scope2026-11-14
cf-199-27-134-12.cloudflare.comIn scope2026-11-14
cf-199-27-134-120.cloudflare.comIn scope2026-11-14
cf-199-27-134-121.cloudflare.comIn scope2026-11-14
cf-199-27-134-122.cloudflare.comIn scope2026-11-14
cf-199-27-134-123.cloudflare.comIn scope2026-11-14
cf-199-27-134-124.cloudflare.comIn scope2026-11-14
cf-199-27-134-125.cloudflare.comIn scope2026-11-14
cf-199-27-134-126.cloudflare.comIn scope2026-11-14
cf-199-27-134-127.cloudflare.comIn scope2026-11-14
cf-199-27-134-128.cloudflare.comIn scope2026-11-14
cf-199-27-134-129.cloudflare.comIn scope2026-11-14
cf-199-27-134-13.cloudflare.comIn scope2026-11-14
cf-199-27-134-130.cloudflare.comIn scope2026-11-14
cf-199-27-134-131.cloudflare.comIn scope2026-11-14
cf-199-27-134-132.cloudflare.comIn scope2026-11-14
cf-199-27-134-133.cloudflare.comIn scope2026-11-14
cf-199-27-134-134.cloudflare.comIn scope2026-11-14
cf-199-27-134-135.cloudflare.comIn scope2026-11-14
cf-199-27-134-136.cloudflare.comIn scope2026-11-14
cf-199-27-134-137.cloudflare.comIn scope2026-11-14
cf-199-27-134-138.cloudflare.comIn scope2026-11-14
cf-199-27-134-139.cloudflare.comIn scope2026-11-14
cf-199-27-134-14.cloudflare.comIn scope2026-11-14
cf-199-27-134-140.cloudflare.comIn scope2026-11-14
cf-199-27-134-141.cloudflare.comIn scope2026-11-14
cf.5d.cf-199-27-134-141.cloudflare.comIn scope2026-11-14
cf-199-27-134-142.cloudflare.comIn scope2026-11-14
cf-199-27-134-143.cloudflare.comIn scope2026-11-14
cf-199-27-134-144.cloudflare.comIn scope2026-11-14
cf-199-27-134-145.cloudflare.comIn scope2026-11-14
cf-199-27-134-146.cloudflare.comIn scope2026-11-14
cf-199-27-134-147.cloudflare.comIn scope2026-11-14
cf-199-27-134-148.cloudflare.comIn scope2026-11-14
cf-199-27-134-149.cloudflare.comIn scope2026-11-14
cf-199-27-134-15.cloudflare.comIn scope2026-11-14
cf-199-27-134-150.cloudflare.comIn scope2026-11-14
cf-199-27-134-151.cloudflare.comIn scope2026-11-14
cf-199-27-134-152.cloudflare.comIn scope2026-11-14
cf-199-27-134-153.cloudflare.comIn scope2026-11-14
cf-199-27-134-154.cloudflare.comIn scope2026-11-14
cf-199-27-134-155.cloudflare.comIn scope2026-11-14
cf-199-27-134-156.cloudflare.comIn scope2026-11-14
cf-199-27-134-157.cloudflare.comIn scope2026-11-14
cf-199-27-134-158.cloudflare.comIn scope2026-11-14
cf-199-27-134-159.cloudflare.comIn scope2026-11-14
cf-199-27-134-16.cloudflare.comIn scope2026-11-14
cf-199-27-134-160.cloudflare.comIn scope2026-11-14
cf-199-27-134-161.cloudflare.comIn scope2026-11-14
cf-199-27-134-162.cloudflare.comIn scope2026-11-14
cf-199-27-134-163.cloudflare.comIn scope2026-11-14
cf-199-27-134-164.cloudflare.comIn scope2026-11-14
cf-199-27-134-165.cloudflare.comIn scope2026-11-14
cf-199-27-134-166.cloudflare.comIn scope2026-11-14
cf-199-27-134-167.cloudflare.comIn scope2026-11-14
cf-199-27-134-168.cloudflare.comIn scope2026-11-14
cf-199-27-134-169.cloudflare.comIn scope2026-11-14
cf-199-27-134-17.cloudflare.comIn scope2026-11-14
cf-199-27-134-170.cloudflare.comIn scope2026-11-14
cf-199-27-134-171.cloudflare.comIn scope2026-11-14
cf-199-27-134-172.cloudflare.comIn scope2026-11-14
cf-199-27-134-173.cloudflare.comIn scope2026-11-14
cf-199-27-134-174.cloudflare.comIn scope2026-11-14
cf-199-27-134-175.cloudflare.comIn scope2026-11-14
cf-199-27-134-176.cloudflare.comIn scope2026-11-14
cf-199-27-134-177.cloudflare.comIn scope2026-11-14
cf-199-27-134-178.cloudflare.comIn scope2026-11-14
cf-199-27-134-179.cloudflare.comIn scope2026-11-14
cf-199-27-134-18.cloudflare.comIn scope2026-11-14
cf-199-27-134-180.cloudflare.comIn scope2026-11-14
cf-199-27-134-181.cloudflare.comIn scope2026-11-14
cf-199-27-134-182.cloudflare.comIn scope2026-11-14
cf-199-27-134-183.cloudflare.comIn scope2026-11-14
cf-199-27-134-184.cloudflare.comIn scope2026-11-14
cf-199-27-134-185.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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Updated