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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 ProblemAnalysed#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-173-245-51-130.cloudflare.comIn scope2026-11-14
cf-173-245-51-131.cloudflare.comIn scope2026-11-14
cf-173-245-51-132.cloudflare.comIn scope2026-11-14
cf-173-245-51-133.cloudflare.comIn scope2026-11-14
cf-173-245-51-134.cloudflare.comIn scope2026-11-14
cf-173-245-51-135.cloudflare.comIn scope2026-11-14
cf-173-245-51-136.cloudflare.comIn scope2026-11-14
cf-173-245-51-137.cloudflare.comIn scope2026-11-14
cf-173-245-51-138.cloudflare.comIn scope2026-11-14
cf-173-245-51-139.cloudflare.comIn scope2026-11-14
cf-173-245-51-14.cloudflare.comIn scope2026-11-14
cf-173-245-51-140.cloudflare.comIn scope2026-11-14
cf-173-245-51-141.cloudflare.comIn scope2026-11-14
cf-173-245-51-142.cloudflare.comIn scope2026-11-14
cf-173-245-51-143.cloudflare.comIn scope2026-11-14
cf-173-245-51-144.cloudflare.comIn scope2026-11-14
cf-173-245-51-145.cloudflare.comIn scope2026-11-14
cf-173-245-51-146.cloudflare.comIn scope2026-11-14
cf-173-245-51-147.cloudflare.comIn scope2026-11-14
cf-173-245-51-148.cloudflare.comIn scope2026-11-14
cf-173-245-51-149.cloudflare.comIn scope2026-11-14
cf-173-245-51-150.cloudflare.comIn scope2026-11-14
cf-173-245-51-151.cloudflare.comIn scope2026-11-14
cf-173-245-51-152.cloudflare.comIn scope2026-11-14
cf-173-245-51-153.cloudflare.comIn scope2026-11-14
cf-173-245-51-154.cloudflare.comIn scope2026-11-14
cf-173-245-51-155.cloudflare.comIn scope2026-11-14
cf-173-245-51-156.cloudflare.comIn scope2026-11-14
cf-173-245-51-157.cloudflare.comIn scope2026-11-14
cf-173-245-51-158.cloudflare.comIn scope2026-11-14
cf-173-245-51-159.cloudflare.comIn scope2026-11-14
cf-173-245-51-16.cloudflare.comIn scope2026-11-14
cf-173-245-51-160.cloudflare.comIn scope2026-11-14
cf-173-245-51-161.cloudflare.comIn scope2026-11-14
cf-173-245-51-162.cloudflare.comIn scope2026-11-14
cf-173-245-51-163.cloudflare.comIn scope2026-11-14
cf-173-245-51-164.cloudflare.comIn scope2026-11-14
cf-173-245-51-165.cloudflare.comIn scope2026-11-14
cf-173-245-51-166.cloudflare.comIn scope2026-11-14
cf-173-245-51-167.cloudflare.comIn scope2026-11-14
cf-173-245-51-168.cloudflare.comIn scope2026-11-14
cf-173-245-51-169.cloudflare.comIn scope2026-11-14
cf-173-245-51-17.cloudflare.comIn scope2026-11-14
cf-173-245-51-170.cloudflare.comIn scope2026-11-14
cf-173-245-51-171.cloudflare.comIn scope2026-11-14
cf-173-245-51-172.cloudflare.comIn scope2026-11-14
cf-173-245-51-173.cloudflare.comIn scope2026-11-14
cf-173-245-51-174.cloudflare.comIn scope2026-11-14
cf-173-245-51-175.cloudflare.comIn scope2026-11-14
cf-173-245-51-176.cloudflare.comIn scope2026-11-14
cf-173-245-51-177.cloudflare.comIn scope2026-11-14
cf-173-245-51-178.cloudflare.comIn scope2026-11-14
cf-173-245-51-179.cloudflare.comIn scope2026-11-14
cf-173-245-51-18.cloudflare.comIn scope2026-11-14
cf-173-245-51-180.cloudflare.comIn scope2026-11-14
cf-173-245-51-181.cloudflare.comIn scope2026-11-14
cf-173-245-51-182.cloudflare.comIn scope2026-11-14
cf-173-245-51-183.cloudflare.comIn scope2026-11-14
cf-173-245-51-184.cloudflare.comIn scope2026-11-14
cf-173-245-51-185.cloudflare.comIn scope2026-11-14
cf-173-245-51-186.cloudflare.comIn scope2026-11-14
cf-173-245-51-187.cloudflare.comIn scope2026-11-14
cf-173-245-51-188.cloudflare.comIn scope2026-11-14
cf-173-245-51-189.cloudflare.comIn scope2026-11-14
cf-173-245-51-19.cloudflare.comIn scope2026-11-14
cf-173-245-51-190.cloudflare.comIn scope2026-11-14
cf-173-245-51-191.cloudflare.comIn scope2026-11-14
cf-173-245-51-192.cloudflare.comIn scope2026-11-14
cf-173-245-51-193.cloudflare.comIn scope2026-11-14
cf-173-245-51-194.cloudflare.comIn scope2026-11-14
cf-173-245-51-195.cloudflare.comIn scope2026-11-14
cf-173-245-51-196.cloudflare.comIn scope2026-11-14
cf-173-245-51-197.cloudflare.comIn scope2026-11-14
cf-173-245-51-198.cloudflare.comIn scope2026-11-14
cf-173-245-51-199.cloudflare.comIn scope2026-11-14
cf-173-245-51-20.cloudflare.comIn scope2026-11-14
cf-173-245-51-200.cloudflare.comIn scope2026-11-14
cf-173-245-51-201.cloudflare.comIn scope2026-11-14
cf-173-245-51-202.cloudflare.comIn scope2026-11-14
cf-173-245-51-203.cloudflare.comIn scope2026-11-14
cf-173-245-51-204.cloudflare.comIn scope2026-11-14
cf-173-245-51-205.cloudflare.comIn scope2026-11-14
cf-173-245-51-206.cloudflare.comIn scope2026-11-14
cf-173-245-51-207.cloudflare.comIn scope2026-11-14
cf-173-245-51-208.cloudflare.comIn scope2026-11-14
cf-173-245-51-209.cloudflare.comIn scope2026-11-14
cf-173-245-51-21.cloudflare.comIn scope2026-11-14
cf-173-245-51-210.cloudflare.comIn scope2026-11-14
cf-173-245-51-211.cloudflare.comIn scope2026-11-14
cf-173-245-51-212.cloudflare.comIn scope2026-11-14
cf-173-245-51-213.cloudflare.comIn scope2026-11-14
cf-173-245-51-214.cloudflare.comIn scope2026-11-14
cf-173-245-51-215.cloudflare.comIn scope2026-11-14
cf-173-245-51-216.cloudflare.comIn scope2026-11-14
cf-173-245-51-217.cloudflare.comIn scope2026-11-14
cf-173-245-51-218.cloudflare.comIn scope2026-11-14
cf-173-245-51-219.cloudflare.comIn scope2026-11-14
cf-173-245-51-22.cloudflare.comIn scope2026-11-14
cf-173-245-51-220.cloudflare.comIn scope2026-11-14
cf-173-245-51-221.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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