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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:cloudflareworkers.com
Scope
Name suggests
First seen
Text fileClear filters465 names
Subdomains of Cloudflare Public Bug Bounty
NameScopeFirst seen
57777hh1165049534c00b9.cloudflareworkers.comNot in the scope2026-11-14
57777hh21124156674c00b9.cloudflareworkers.comNot in the scope2026-11-14
57777hh42721514c00b9.cloudflareworkers.comNot in the scope2026-11-14
57777hh7663130724c00b9.cloudflareworkers.comNot in the scope2026-11-14
58297deef9b04764c3beab820b73d524.cloudflareworkers.comNot in the scope2026-11-14
5a70d8abd9a62ee8b82174605c512de0.cloudflareworkers.comNot in the scope2026-11-14
5afecfce823fba042d88757ca4e24999.cloudflareworkers.comNot in the scope2026-11-14
5b99d8c85930c3e9a32d733f02cf6355.cloudflareworkers.comNot in the scope2026-11-14
5bd20fd46fb032899032691bfeb7e189.cloudflareworkers.comNot in the scope2026-11-14
5e5e.cloudflareworkers.comNot in the scope2026-11-14
5e8f8a220ca0c18e33a2c10818a010f2.cloudflareworkers.comNot in the scope2026-11-14
5ffed76e12aca0684ed74900e17a7ab0.cloudflareworkers.comNot in the scope2026-11-14
6014020e64caca282bac31a400b962f3.cloudflareworkers.comNot in the scope2026-11-14
607d9.cloudflareworkers.comNot in the scope2026-11-14
61175082d7d56a047a0a28d89c4963a6.cloudflareworkers.comNot in the scope2026-11-14
62f1.cloudflareworkers.comNot in the scope2026-11-14
653bf6c98f7f54c91a11b62ee2b7901a.cloudflareworkers.comNot in the scope2026-11-14
654e610b8e9681200832e816feed02bc.cloudflareworkers.comNot in the scope2026-11-14
6667lll184435817a302d2.cloudflareworkers.comNot in the scope2026-11-14
6677lgu1285628934b26b3f.cloudflareworkers.comNot in the scope2026-11-14
6677lgu2315827252b26b3f.cloudflareworkers.comNot in the scope2026-11-14
6677lgu261657852b26b3f.cloudflareworkers.comNot in the scope2026-11-14
682e.cloudflareworkers.comNot in the scope2026-11-14
69aai7fdde8.cloudflareworkers.comNot in the scope2026-11-14
69d25d77cf1c746ff268ae65516cd756.cloudflareworkers.comNot in the scope2026-11-14
69hhiee2315745061210c2b.cloudflareworkers.comNot in the scope2026-11-14
69hhiee3116641041210c2b.cloudflareworkers.comNot in the scope2026-11-14
69hhiee4408100701210c2b.cloudflareworkers.comNot in the scope2026-11-14
6a8d5c5b06a1128f986a8fb767928bec.cloudflareworkers.comNot in the scope2026-11-14
6b32fc58c7b2e128280ae9bcda95fde1.cloudflareworkers.comNot in the scope2026-11-14
6b3f.cloudflareworkers.comNot in the scope2026-11-14
6bebde548b449bba729c7e4ce321dc68.cloudflareworkers.comNot in the scope2026-11-14
6c011d62ffaa9c9f805bbbaa54d4d3df.cloudflareworkers.comNot in the scope2026-11-14
6c28a4f9b197fc5a9a1bfd5a7b32a6fc.cloudflareworkers.comNot in the scope2026-11-14
6ddcceb2065822a0a631293f6984f08d.cloudflareworkers.comNot in the scope2026-11-14
70f46a033c5ae4db692288f5e2b0943e.cloudflareworkers.comNot in the scope2026-11-14
71546110e579edac923b3afdc5ed3d4e.cloudflareworkers.comNot in the scope2026-11-14
71713daee6a04f7d12617bfdea3f3573.cloudflareworkers.comNot in the scope2026-11-14
71e8.cloudflareworkers.comNot in the scope2026-11-14
720da226e2ab993e312fe4f967df3daa.cloudflareworkers.comNot in the scope2026-11-14
72113.cloudflareworkers.comNot in the scope2026-11-14
72474bfd8df47d2d015b87b180da4086.cloudflareworkers.comNot in the scope2026-11-14
73d428020e45a4beddbee6187684b621.cloudflareworkers.comNot in the scope2026-11-14
74b74.cloudflareworkers.comNot in the scope2026-11-14
77hgg7caef6.cloudflareworkers.comNot in the scope2026-11-14
7b8f5832969d2cc7e62b2751530cbdba.cloudflareworkers.comNot in the scope2026-11-14
7c75c0cfcb86d819779c2d4c600c26ac.cloudflareworkers.comNot in the scope2026-11-14
7hhggii6d5e5e.cloudflareworkers.comNot in the scope2026-11-14
837f0f6ea9d7a3be9fd45dd8ba2612.cloudflareworkers.comNot in the scope2026-11-14
839349de0066d2eae5846a902f0ec2a1.cloudflareworkers.comNot in the scope2026-11-14
84694db7f77bc00694ca073b2393d438.cloudflareworkers.comNot in the scope2026-11-14
84efc29573641d2f04337907900ab249.cloudflareworkers.comNot in the scope2026-11-14
85e9cf31f557c17deba49cf735177d18.cloudflareworkers.comNot in the scope2026-11-14
860efffc227212a2bdf6d51708ba4a7d.cloudflareworkers.comNot in the scope2026-11-14
8800dda173413087434eef9.cloudflareworkers.comNot in the scope2026-11-14
8800dda277581019434eef9.cloudflareworkers.comNot in the scope2026-11-14
88516b87c3279710844407070cb8af75.cloudflareworkers.comNot in the scope2026-11-14
8866ddd28104143716d5e5e.cloudflareworkers.comNot in the scope2026-11-14
8866ddd7771251526d5e5e.cloudflareworkers.comNot in the scope2026-11-14
88a8b358ab1e97703e7efbc1238089af.cloudflareworkers.comNot in the scope2026-11-14
88d52e7022408461a5dc2b76715c0814.cloudflareworkers.comNot in the scope2026-11-14
8ad171bea48464bb9663eeac99ed6cc7.cloudflareworkers.comNot in the scope2026-11-14
8c4905a7d1d5a3f25b3056926ec204be.cloudflareworkers.comNot in the scope2026-11-14
8d47388b4f14d97dce72131ad23dce24.cloudflareworkers.comNot in the scope2026-11-14
8dc5c.cloudflareworkers.comNot in the scope2026-11-14
8de9b889d05200b7e801a4312e35ac22.cloudflareworkers.comNot in the scope2026-11-14
8fc06c817f2217c6e18baac51a3a28fd.cloudflareworkers.comNot in the scope2026-11-14
902ad399ecac1b6a40b892f1c15f5f07.cloudflareworkers.comNot in the scope2026-11-14
9051338f87b0a61b94bdbcf2fd3f2708.cloudflareworkers.comNot in the scope2026-11-14
912ee8504b924e2291419739736c61d6.cloudflareworkers.comNot in the scope2026-11-14
91d29b0c94fbadce9036158dd8628dd7.cloudflareworkers.comNot in the scope2026-11-14
927ac5407f001785fae2a9e1362dff59.cloudflareworkers.comNot in the scope2026-11-14
96a2ac2e69a05e8d48fad75b4a9b83b4.cloudflareworkers.comNot in the scope2026-11-14
9880dda25423275402a8dc5c.cloudflareworkers.comNot in the scope2026-11-14
9880dda257231232a8dc5c.cloudflareworkers.comNot in the scope2026-11-14
9985152c4d94fef5b5e4b7cf85296fe0.cloudflareworkers.comNot in the scope2026-11-14
9a242f2a3b8da46807ef8b6899b6b349.cloudflareworkers.comNot in the scope2026-11-14
9a54c96624befe3dcf7d035d14c9e3c4.cloudflareworkers.comNot in the scope2026-11-14
9b687c08343e9d7f27a7b650f06ae8fb.cloudflareworkers.comNot in the scope2026-11-14
profiles.9f4c01bbefc2c59a556420608b188189.cloudflareworkers.comNot in the scope2026-11-14
9hhddde5aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
a03f2ae983bd2045e794bc70f204e17f.cloudflareworkers.comNot in the scope2026-11-14
a041b6a18670fee572e2a5f7d2ed1ba8.cloudflareworkers.comNot in the scope2026-11-14
a06687c51c3b862b832fa0a9dd8b036e.cloudflareworkers.comNot in the scope2026-11-14
a12e56aa1cc71c34058dca637b3c5b9a.cloudflareworkers.comNot in the scope2026-11-14
a1eeae1ee198222306b19e200bd85106.cloudflareworkers.comNot in the scope2026-11-14
a2f19b4be7e467578e4d719f8ac68587.cloudflareworkers.comNot in the scope2026-11-14
a2fxsw13593bbxxzzz6d5e5e.cloudflareworkers.comNot in the scope2026-11-14
a4144a1f6d89a8162852f6bae1a921ff.cloudflareworkers.comNot in the scope2026-11-14
a489b645143e8e8ab59e07a7a90eb3ab.cloudflareworkers.comNot in the scope2026-11-14
a4a96216a86345a83b04edbfa849d6df.cloudflareworkers.comNot in the scope2026-11-14
a6165af53d6da1638d70478e9462e881.cloudflareworkers.comNot in the scope2026-11-14
aa801a7e7a55007c58b1b0a74868b06f.cloudflareworkers.comNot in the scope2026-11-14
ab5dc5cfe75d470be7ad15b7aab6b789.cloudflareworkers.comNot in the scope2026-11-14
ae95481ba61c885a8077cd31d4049e3f.cloudflareworkers.comNot in the scope2026-11-14
aefdf4a7f30127d8d1ba4a4387818cd3.cloudflareworkers.comNot in the scope2026-11-14
af1196a00d169722b358c92e9df8fdf5.cloudflareworkers.comNot in the scope2026-11-14
af27388321b471a04ccc4bece0272a7d.cloudflareworkers.comNot in the scope2026-11-14
apply.cloudflareworkers.comNot in the scope2026-11-14
baselime.apply.cloudflareworkers.comNot in the 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