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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
ns0138.secondary.cloudflare.comIn scope2026-11-14
ns0139.secondary.cloudflare.comIn scope2026-11-14
ns0140.secondary.cloudflare.comIn scope2026-11-14
ns0141.secondary.cloudflare.comIn scope2026-11-14
ns0142.secondary.cloudflare.comIn scope2026-11-14
ns0143.secondary.cloudflare.comIn scope2026-11-14
ns0144.secondary.cloudflare.comIn scope2026-11-14
ns0145.secondary.cloudflare.comIn scope2026-11-14
ns0146.secondary.cloudflare.comIn scope2026-11-14
ns0147.secondary.cloudflare.comIn scope2026-11-14
ns0148.secondary.cloudflare.comIn scope2026-11-14
ns0149.secondary.cloudflare.comIn scope2026-11-14
ns0150.secondary.cloudflare.comIn scope2026-11-14
ns0151.secondary.cloudflare.comIn scope2026-11-14
ns0152.secondary.cloudflare.comIn scope2026-11-14
ns0153.secondary.cloudflare.comIn scope2026-11-14
ns0154.secondary.cloudflare.comIn scope2026-11-14
ns0155.secondary.cloudflare.comIn scope2026-11-14
ns0156.secondary.cloudflare.comIn scope2026-11-14
ns0157.secondary.cloudflare.comIn scope2026-11-14
ns0158.secondary.cloudflare.comIn scope2026-11-14
ns0159.secondary.cloudflare.comIn scope2026-11-14
ns0160.secondary.cloudflare.comIn scope2026-11-14
ns0161.secondary.cloudflare.comIn scope2026-11-14
ns0162.secondary.cloudflare.comIn scope2026-11-14
ns0163.secondary.cloudflare.comIn scope2026-11-14
ns0164.secondary.cloudflare.comIn scope2026-11-14
ns0165.secondary.cloudflare.comIn scope2026-11-14
ns0166.secondary.cloudflare.comIn scope2026-11-14
ns0167.secondary.cloudflare.comIn scope2026-11-14
ns0168.secondary.cloudflare.comIn scope2026-11-14
ns0169.secondary.cloudflare.comIn scope2026-11-14
ns0170.secondary.cloudflare.comIn scope2026-11-14
ns0171.secondary.cloudflare.comIn scope2026-11-14
ns0172.secondary.cloudflare.comIn scope2026-11-14
ns0173.secondary.cloudflare.comIn scope2026-11-14
ns0174.secondary.cloudflare.comIn scope2026-11-14
ns0175.secondary.cloudflare.comIn scope2026-11-14
ns0176.secondary.cloudflare.comIn scope2026-11-14
ns0177.secondary.cloudflare.comIn scope2026-11-14
ns0178.secondary.cloudflare.comIn scope2026-11-14
ns0179.secondary.cloudflare.comIn scope2026-11-14
ns0180.secondary.cloudflare.comIn scope2026-11-14
ns0181.secondary.cloudflare.comIn scope2026-11-14
ns0182.secondary.cloudflare.comIn scope2026-11-14
ns0183.secondary.cloudflare.comIn scope2026-11-14
ns0184.secondary.cloudflare.comIn scope2026-11-14
ns0185.secondary.cloudflare.comIn scope2026-11-14
ns0186.secondary.cloudflare.comIn scope2026-11-14
ns0187.secondary.cloudflare.comIn scope2026-11-14
ns0188.secondary.cloudflare.comIn scope2026-11-14
ns0189.secondary.cloudflare.comIn scope2026-11-14
ns0190.secondary.cloudflare.comIn scope2026-11-14
ns0191.secondary.cloudflare.comIn scope2026-11-14
ns0192.secondary.cloudflare.comIn scope2026-11-14
ns0193.secondary.cloudflare.comIn scope2026-11-14
ns0194.secondary.cloudflare.comIn scope2026-11-14
ns0195.secondary.cloudflare.comIn scope2026-11-14
ns0196.secondary.cloudflare.comIn scope2026-11-14
ns0197.secondary.cloudflare.comIn scope2026-11-14
ns0198.secondary.cloudflare.comIn scope2026-11-14
ns0199.secondary.cloudflare.comIn scope2026-11-14
ns0200.secondary.cloudflare.comIn scope2026-11-14
ns0201.secondary.cloudflare.comIn scope2026-11-14
ns0202.secondary.cloudflare.comIn scope2026-11-14
ns0203.secondary.cloudflare.comIn scope2026-11-14
ns0204.secondary.cloudflare.comIn scope2026-11-14
ns0205.secondary.cloudflare.comIn scope2026-11-14
ns0206.secondary.cloudflare.comIn scope2026-11-14
ns0207.secondary.cloudflare.comIn scope2026-11-14
ns0208.secondary.cloudflare.comIn scope2026-11-14
ns0209.secondary.cloudflare.comIn scope2026-11-14
ns0210.secondary.cloudflare.comIn scope2026-11-14
ns0211.secondary.cloudflare.comIn scope2026-11-14
ns0212.secondary.cloudflare.comIn scope2026-11-14
ns0213.secondary.cloudflare.comIn scope2026-11-14
ns0214.secondary.cloudflare.comIn scope2026-11-14
ns0215.secondary.cloudflare.comIn scope2026-11-14
ns0216.secondary.cloudflare.comIn scope2026-11-14
ns0217.secondary.cloudflare.comIn scope2026-11-14
ns0218.secondary.cloudflare.comIn scope2026-11-14
ns0219.secondary.cloudflare.comIn scope2026-11-14
ns0220.secondary.cloudflare.comIn scope2026-11-14
ns0221.secondary.cloudflare.comIn scope2026-11-14
ns0222.secondary.cloudflare.comIn scope2026-11-14
ns0223.secondary.cloudflare.comIn scope2026-11-14
ns0224.secondary.cloudflare.comIn scope2026-11-14
ns0225.secondary.cloudflare.comIn scope2026-11-14
ns0226.secondary.cloudflare.comIn scope2026-11-14
ns0227.secondary.cloudflare.comIn scope2026-11-14
ns0228.secondary.cloudflare.comIn scope2026-11-14
ns0229.secondary.cloudflare.comIn scope2026-11-14
ns0230.secondary.cloudflare.comIn scope2026-11-14
ns0231.secondary.cloudflare.comIn scope2026-11-14
ns0232.secondary.cloudflare.comIn scope2026-11-14
ns0233.secondary.cloudflare.comIn scope2026-11-14
ns0234.secondary.cloudflare.comIn scope2026-11-14
ns0235.secondary.cloudflare.comIn scope2026-11-14
ns0236.secondary.cloudflare.comIn scope2026-11-14
ns0237.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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