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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
ssl2185.cloudflare.comIn scope2026-11-14
ssl2186.cloudflare.comIn scope2026-11-14
ssl2187.cloudflare.comIn scope2026-11-14
ssl2188.cloudflare.comIn scope2026-11-14
ssl2189.cloudflare.comIn scope2026-11-14
ssl2190.cloudflare.comIn scope2026-11-14
ssl2191.cloudflare.comIn scope2026-11-14
ssl2192.cloudflare.comIn scope2026-11-14
ssl2193.cloudflare.comIn scope2026-11-14
ssl2194.cloudflare.comIn scope2026-11-14
ssl2195.cloudflare.comIn scope2026-11-14
ssl2196.cloudflare.comIn scope2026-11-14
ssl2197.cloudflare.comIn scope2026-11-14
ssl2198.cloudflare.comIn scope2026-11-14
ssl2199.cloudflare.comIn scope2026-11-14
ssl22.cloudflare.comIn scope2026-11-14
ssl2200.cloudflare.comIn scope2026-11-14
ssl2201.cloudflare.comIn scope2026-11-14
ssl2202.cloudflare.comIn scope2026-11-14
ssl2203.cloudflare.comIn scope2026-11-14
ssl2204.cloudflare.comIn scope2026-11-14
ssl2205.cloudflare.comIn scope2026-11-14
ssl2206.cloudflare.comIn scope2026-11-14
ssl2207.cloudflare.comIn scope2026-11-14
ssl2208.cloudflare.comIn scope2026-11-14
ssl2209.cloudflare.comIn scope2026-11-14
ssl2210.cloudflare.comIn scope2026-11-14
ssl2211.cloudflare.comIn scope2026-11-14
ssl2212.cloudflare.comIn scope2026-11-14
ssl2213.cloudflare.comIn scope2026-11-14
ssl2214.cloudflare.comIn scope2026-11-14
ssl2215.cloudflare.comIn scope2026-11-14
ssl2216.cloudflare.comIn scope2026-11-14
ssl2217.cloudflare.comIn scope2026-11-14
ssl2218.cloudflare.comIn scope2026-11-14
ssl2219.cloudflare.comIn scope2026-11-14
ssl2220.cloudflare.comIn scope2026-11-14
ssl2221.cloudflare.comIn scope2026-11-14
ssl2222.cloudflare.comIn scope2026-11-14
ssl2223.cloudflare.comIn scope2026-11-14
ssl2224.cloudflare.comIn scope2026-11-14
ssl2225.cloudflare.comIn scope2026-11-14
ssl2226.cloudflare.comIn scope2026-11-14
ssl2227.cloudflare.comIn scope2026-11-14
ssl2228.cloudflare.comIn scope2026-11-14
ssl2229.cloudflare.comIn scope2026-11-14
ssl2230.cloudflare.comIn scope2026-11-14
ssl2231.cloudflare.comIn scope2026-11-14
ssl2232.cloudflare.comIn scope2026-11-14
ssl2233.cloudflare.comIn scope2026-11-14
ssl2234.cloudflare.comIn scope2026-11-14
ssl2235.cloudflare.comIn scope2026-11-14
ssl2236.cloudflare.comIn scope2026-11-14
ssl2237.cloudflare.comIn scope2026-11-14
ssl2238.cloudflare.comIn scope2026-11-14
ssl2239.cloudflare.comIn scope2026-11-14
ssl2240.cloudflare.comIn scope2026-11-14
ssl2241.cloudflare.comIn scope2026-11-14
ssl2242.cloudflare.comIn scope2026-11-14
ssl2243.cloudflare.comIn scope2026-11-14
ssl2244.cloudflare.comIn scope2026-11-14
ssl2245.cloudflare.comIn scope2026-11-14
ssl2246.cloudflare.comIn scope2026-11-14
ssl2247.cloudflare.comIn scope2026-11-14
ssl2248.cloudflare.comIn scope2026-11-14
ssl2249.cloudflare.comIn scope2026-11-14
ssl2250.cloudflare.comIn scope2026-11-14
ssl2251.cloudflare.comIn scope2026-11-14
ssl2252.cloudflare.comIn scope2026-11-14
ssl2253.cloudflare.comIn scope2026-11-14
ssl2254.cloudflare.comIn scope2026-11-14
ssl2255.cloudflare.comIn scope2026-11-14
ssl2256.cloudflare.comIn scope2026-11-14
ssl2257.cloudflare.comIn scope2026-11-14
ssl2258.cloudflare.comIn scope2026-11-14
ssl2259.cloudflare.comIn scope2026-11-14
ssl2260.cloudflare.comIn scope2026-11-14
ssl2261.cloudflare.comIn scope2026-11-14
ssl2262.cloudflare.comIn scope2026-11-14
ssl2263.cloudflare.comIn scope2026-11-14
ssl2264.cloudflare.comIn scope2026-11-14
ssl2265.cloudflare.comIn scope2026-11-14
ssl2266.cloudflare.comIn scope2026-11-14
ssl2267.cloudflare.comIn scope2026-11-14
ssl2268.cloudflare.comIn scope2026-11-14
ssl2269.cloudflare.comIn scope2026-11-14
ssl2270.cloudflare.comIn scope2026-11-14
ssl2271.cloudflare.comIn scope2026-11-14
ssl2272.cloudflare.comIn scope2026-11-14
ssl2273.cloudflare.comIn scope2026-11-14
ssl2274.cloudflare.comIn scope2026-11-14
ssl2275.cloudflare.comIn scope2026-11-14
ssl2276.cloudflare.comIn scope2026-11-14
ssl2277.cloudflare.comIn scope2026-11-14
ssl2278.cloudflare.comIn scope2026-11-14
ssl2279.cloudflare.comIn scope2026-11-14
ssl2280.cloudflare.comIn scope2026-11-14
ssl2281.cloudflare.comIn scope2026-11-14
ssl2282.cloudflare.comIn scope2026-11-14
ssl2283.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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