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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
ns0038.secondary.cloudflare.comIn scope2026-11-14
ns0039.secondary.cloudflare.comIn scope2026-11-14
ns0040.secondary.cloudflare.comIn scope2026-11-14
ns0041.secondary.cloudflare.comIn scope2026-11-14
ns0042.secondary.cloudflare.comIn scope2026-11-14
ns0043.secondary.cloudflare.comIn scope2026-11-14
ns0044.secondary.cloudflare.comIn scope2026-11-14
ns0045.secondary.cloudflare.comIn scope2026-11-14
ns0046.secondary.cloudflare.comIn scope2026-11-14
ns0047.secondary.cloudflare.comIn scope2026-11-14
ns0048.secondary.cloudflare.comIn scope2026-11-14
ns0049.secondary.cloudflare.comIn scope2026-11-14
ns0050.secondary.cloudflare.comIn scope2026-11-14
ns0051.secondary.cloudflare.comIn scope2026-11-14
ns0052.secondary.cloudflare.comIn scope2026-11-14
ns0053.secondary.cloudflare.comIn scope2026-11-14
ns0054.secondary.cloudflare.comIn scope2026-11-14
ns0055.secondary.cloudflare.comIn scope2026-11-14
ns0056.secondary.cloudflare.comIn scope2026-11-14
ns0057.secondary.cloudflare.comIn scope2026-11-14
ns0058.secondary.cloudflare.comIn scope2026-11-14
ns0059.secondary.cloudflare.comIn scope2026-11-14
ns0060.secondary.cloudflare.comIn scope2026-11-14
ns0061.secondary.cloudflare.comIn scope2026-11-14
ns0062.secondary.cloudflare.comIn scope2026-11-14
ns0063.secondary.cloudflare.comIn scope2026-11-14
ns0064.secondary.cloudflare.comIn scope2026-11-14
ns0065.secondary.cloudflare.comIn scope2026-11-14
ns0066.secondary.cloudflare.comIn scope2026-11-14
ns0067.secondary.cloudflare.comIn scope2026-11-14
ns0068.secondary.cloudflare.comIn scope2026-11-14
ns0069.secondary.cloudflare.comIn scope2026-11-14
ns0070.secondary.cloudflare.comIn scope2026-11-14
ns0071.secondary.cloudflare.comIn scope2026-11-14
ns0072.secondary.cloudflare.comIn scope2026-11-14
ns0073.secondary.cloudflare.comIn scope2026-11-14
ns0074.secondary.cloudflare.comIn scope2026-11-14
ns0075.secondary.cloudflare.comIn scope2026-11-14
ns0076.secondary.cloudflare.comIn scope2026-11-14
ns0077.secondary.cloudflare.comIn scope2026-11-14
ns0078.secondary.cloudflare.comIn scope2026-11-14
ns0079.secondary.cloudflare.comIn scope2026-11-14
ns0080.secondary.cloudflare.comIn scope2026-11-14
ns0081.secondary.cloudflare.comIn scope2026-11-14
ns0082.secondary.cloudflare.comIn scope2026-11-14
ns0083.secondary.cloudflare.comIn scope2026-11-14
ns0084.secondary.cloudflare.comIn scope2026-11-14
ns0085.secondary.cloudflare.comIn scope2026-11-14
ns0086.secondary.cloudflare.comIn scope2026-11-14
ns0087.secondary.cloudflare.comIn scope2026-11-14
ns0088.secondary.cloudflare.comIn scope2026-11-14
ns0089.secondary.cloudflare.comIn scope2026-11-14
ns0090.secondary.cloudflare.comIn scope2026-11-14
ns0091.secondary.cloudflare.comIn scope2026-11-14
ns0092.secondary.cloudflare.comIn scope2026-11-14
ns0093.secondary.cloudflare.comIn scope2026-11-14
ns0094.secondary.cloudflare.comIn scope2026-11-14
ns0095.secondary.cloudflare.comIn scope2026-11-14
ns0096.secondary.cloudflare.comIn scope2026-11-14
ns0097.secondary.cloudflare.comIn scope2026-11-14
ns0098.secondary.cloudflare.comIn scope2026-11-14
ns0099.secondary.cloudflare.comIn scope2026-11-14
ns0100.secondary.cloudflare.comIn scope2026-11-14
ns0101.secondary.cloudflare.comIn scope2026-11-14
ns0102.secondary.cloudflare.comIn scope2026-11-14
ns0103.secondary.cloudflare.comIn scope2026-11-14
ns0104.secondary.cloudflare.comIn scope2026-11-14
ns0105.secondary.cloudflare.comIn scope2026-11-14
ns0106.secondary.cloudflare.comIn scope2026-11-14
ns0107.secondary.cloudflare.comIn scope2026-11-14
ns0108.secondary.cloudflare.comIn scope2026-11-14
ns0109.secondary.cloudflare.comIn scope2026-11-14
ns0110.secondary.cloudflare.comIn scope2026-11-14
ns0111.secondary.cloudflare.comIn scope2026-11-14
ns0112.secondary.cloudflare.comIn scope2026-11-14
ns0113.secondary.cloudflare.comIn scope2026-11-14
ns0114.secondary.cloudflare.comIn scope2026-11-14
ns0115.secondary.cloudflare.comIn scope2026-11-14
ns0116.secondary.cloudflare.comIn scope2026-11-14
ns0117.secondary.cloudflare.comIn scope2026-11-14
ns0118.secondary.cloudflare.comIn scope2026-11-14
ns0119.secondary.cloudflare.comIn scope2026-11-14
ns0120.secondary.cloudflare.comIn scope2026-11-14
ns0121.secondary.cloudflare.comIn scope2026-11-14
ns0122.secondary.cloudflare.comIn scope2026-11-14
ns0123.secondary.cloudflare.comIn scope2026-11-14
ns0124.secondary.cloudflare.comIn scope2026-11-14
ns0125.secondary.cloudflare.comIn scope2026-11-14
ns0126.secondary.cloudflare.comIn scope2026-11-14
ns0127.secondary.cloudflare.comIn scope2026-11-14
ns0128.secondary.cloudflare.comIn scope2026-11-14
ns0129.secondary.cloudflare.comIn scope2026-11-14
ns0130.secondary.cloudflare.comIn scope2026-11-14
ns0131.secondary.cloudflare.comIn scope2026-11-14
ns0132.secondary.cloudflare.comIn scope2026-11-14
ns0133.secondary.cloudflare.comIn scope2026-11-14
ns0134.secondary.cloudflare.comIn scope2026-11-14
ns0135.secondary.cloudflare.comIn scope2026-11-14
ns0136.secondary.cloudflare.comIn scope2026-11-14
ns0137.secondary.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