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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:cloudflare.com
Scope
Name suggests
First seen
Text fileClear filters18,951 names
Subdomains of Cloudflare Public Bug Bounty
NameScopeFirst seen
cf-173-245-53-128.cloudflare.comIn scope2026-11-14
cf-173-245-53-129.cloudflare.comIn scope2026-11-14
cf-173-245-53-13.cloudflare.comIn scope2026-11-14
cf-173-245-53-130.cloudflare.comIn scope2026-11-14
cf-173-245-53-131.cloudflare.comIn scope2026-11-14
cf-173-245-53-132.cloudflare.comIn scope2026-11-14
cf-173-245-53-133.cloudflare.comIn scope2026-11-14
cf-173-245-53-134.cloudflare.comIn scope2026-11-14
cf-173-245-53-135.cloudflare.comIn scope2026-11-14
cf-173-245-53-136.cloudflare.comIn scope2026-11-14
cf-173-245-53-137.cloudflare.comIn scope2026-11-14
cf-173-245-53-138.cloudflare.comIn scope2026-11-14
cf-173-245-53-139.cloudflare.comIn scope2026-11-14
cf-173-245-53-14.cloudflare.comIn scope2026-11-14
cf-173-245-53-140.cloudflare.comIn scope2026-11-14
cf-173-245-53-141.cloudflare.comIn scope2026-11-14
cf-173-245-53-142.cloudflare.comIn scope2026-11-14
cf-173-245-53-143.cloudflare.comIn scope2026-11-14
cf-173-245-53-144.cloudflare.comIn scope2026-11-14
cf-173-245-53-145.cloudflare.comIn scope2026-11-14
cf-173-245-53-146.cloudflare.comIn scope2026-11-14
cf-173-245-53-147.cloudflare.comIn scope2026-11-14
cf-173-245-53-148.cloudflare.comIn scope2026-11-14
cf-173-245-53-149.cloudflare.comIn scope2026-11-14
cf-173-245-53-15.cloudflare.comIn scope2026-11-14
cf-173-245-53-150.cloudflare.comIn scope2026-11-14
cf-173-245-53-151.cloudflare.comIn scope2026-11-14
cf-173-245-53-152.cloudflare.comIn scope2026-11-14
cf-173-245-53-153.cloudflare.comIn scope2026-11-14
cf-173-245-53-154.cloudflare.comIn scope2026-11-14
cf-173-245-53-155.cloudflare.comIn scope2026-11-14
cf-173-245-53-156.cloudflare.comIn scope2026-11-14
cf-173-245-53-157.cloudflare.comIn scope2026-11-14
cf-173-245-53-158.cloudflare.comIn scope2026-11-14
cf-173-245-53-159.cloudflare.comIn scope2026-11-14
cf-173-245-53-16.cloudflare.comIn scope2026-11-14
cf-173-245-53-160.cloudflare.comIn scope2026-11-14
cf-173-245-53-161.cloudflare.comIn scope2026-11-14
cf-173-245-53-162.cloudflare.comIn scope2026-11-14
cf-173-245-53-163.cloudflare.comIn scope2026-11-14
cf-173-245-53-164.cloudflare.comIn scope2026-11-14
cf-173-245-53-165.cloudflare.comIn scope2026-11-14
cf-173-245-53-166.cloudflare.comIn scope2026-11-14
cf-173-245-53-167.cloudflare.comIn scope2026-11-14
cf-173-245-53-168.cloudflare.comIn scope2026-11-14
cf-173-245-53-169.cloudflare.comIn scope2026-11-14
cf-173-245-53-170.cloudflare.comIn scope2026-11-14
cf-173-245-53-171.cloudflare.comIn scope2026-11-14
cf-173-245-53-172.cloudflare.comIn scope2026-11-14
cf-173-245-53-173.cloudflare.comIn scope2026-11-14
cf-173-245-53-174.cloudflare.comIn scope2026-11-14
cf-173-245-53-175.cloudflare.comIn scope2026-11-14
cf-173-245-53-176.cloudflare.comIn scope2026-11-14
cf-173-245-53-177.cloudflare.comIn scope2026-11-14
cf-173-245-53-178.cloudflare.comIn scope2026-11-14
cf-173-245-53-179.cloudflare.comIn scope2026-11-14
cf-173-245-53-18.cloudflare.comIn scope2026-11-14
cf-173-245-53-180.cloudflare.comIn scope2026-11-14
cf-173-245-53-181.cloudflare.comIn scope2026-11-14
cf-173-245-53-182.cloudflare.comIn scope2026-11-14
cf-173-245-53-183.cloudflare.comIn scope2026-11-14
cf-173-245-53-184.cloudflare.comIn scope2026-11-14
cf-173-245-53-185.cloudflare.comIn scope2026-11-14
cf-173-245-53-186.cloudflare.comIn scope2026-11-14
cf-173-245-53-187.cloudflare.comIn scope2026-11-14
cf-173-245-53-188.cloudflare.comIn scope2026-11-14
cf-173-245-53-189.cloudflare.comIn scope2026-11-14
cf-173-245-53-19.cloudflare.comIn scope2026-11-14
cf-173-245-53-190.cloudflare.comIn scope2026-11-14
cf-173-245-53-191.cloudflare.comIn scope2026-11-14
cf-173-245-53-192.cloudflare.comIn scope2026-11-14
cf-173-245-53-193.cloudflare.comIn scope2026-11-14
cf-173-245-53-194.cloudflare.comIn scope2026-11-14
cf-173-245-53-195.cloudflare.comIn scope2026-11-14
cf-173-245-53-196.cloudflare.comIn scope2026-11-14
cf-173-245-53-197.cloudflare.comIn scope2026-11-14
cf-173-245-53-198.cloudflare.comIn scope2026-11-14
cf-173-245-53-199.cloudflare.comIn scope2026-11-14
cf-173-245-53-20.cloudflare.comIn scope2026-11-14
cf-173-245-53-200.cloudflare.comIn scope2026-11-14
cf-173-245-53-201.cloudflare.comIn scope2026-11-14
cf-173-245-53-202.cloudflare.comIn scope2026-11-14
cf-173-245-53-203.cloudflare.comIn scope2026-11-14
cf-173-245-53-204.cloudflare.comIn scope2026-11-14
cf-173-245-53-205.cloudflare.comIn scope2026-11-14
cf-173-245-53-206.cloudflare.comIn scope2026-11-14
cf-173-245-53-207.cloudflare.comIn scope2026-11-14
cf-173-245-53-208.cloudflare.comIn scope2026-11-14
cf-173-245-53-209.cloudflare.comIn scope2026-11-14
cf-173-245-53-21.cloudflare.comIn scope2026-11-14
cf-173-245-53-210.cloudflare.comIn scope2026-11-14
cf-173-245-53-211.cloudflare.comIn scope2026-11-14
cf-173-245-53-212.cloudflare.comIn scope2026-11-14
cf-173-245-53-213.cloudflare.comIn scope2026-11-14
cf-173-245-53-214.cloudflare.comIn scope2026-11-14
cf-173-245-53-215.cloudflare.comIn scope2026-11-14
cf-173-245-53-216.cloudflare.comIn scope2026-11-14
cf-173-245-53-217.cloudflare.comIn scope2026-11-14
cf-173-245-53-218.cloudflare.comIn scope2026-11-14
cf-173-245-53-219.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