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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
0027ccb97c839fec02edebe904d50ff8.cloudflareworkers.comNot in the scope2026-11-14
00b9.cloudflareworkers.comNot in the scope2026-11-14
012a.cloudflareworkers.comNot in the scope2026-11-14
026b6e65328f3a1ccd78818de8713871.cloudflareworkers.comNot in the scope2026-11-14
047f1a53030fe34def57fee3d334f0c4.cloudflareworkers.comNot in the scope2026-11-14
04ed5b1abeb50fa1f88527daa3e45523.cloudflareworkers.comNot in the scope2026-11-14
05094beb8e5749b6da775996d35db3e9.cloudflareworkers.comNot in the scope2026-11-14
0629.cloudflareworkers.comNot in the scope2026-11-14
0758f34a7458513272cf89a39ad450d4.cloudflareworkers.comNot in the scope2026-11-14
08536.cloudflareworkers.comNot in the scope2026-11-14
08799e34d4ea0b448bdde47f61f8e2ed.cloudflareworkers.comNot in the scope2026-11-14
08eaf8b678ce2065e724ef0775c28fdc.cloudflareworkers.comNot in the scope2026-11-14
0ad4f3c27e04562aac705ec9a689df7b.cloudflareworkers.comNot in the scope2026-11-14
0d47f4d8e689022ef858d5465612940d.cloudflareworkers.comNot in the scope2026-11-14
0ddaaaw1573682845b8a01.cloudflareworkers.comNot in the scope2026-11-14
0ddaaaw19651178005b8a01.cloudflareworkers.comNot in the scope2026-11-14
0e23.cloudflareworkers.comNot in the scope2026-11-14
0f46c90535b0427d7bfc332e4a4e1029.cloudflareworkers.comNot in the scope2026-11-14
115f.cloudflareworkers.comNot in the scope2026-11-14
13023071da82751cf504af85aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
rrnd7e1062d.13023071da82751cf504af85aa406cd0.cloudflareworkers.comNot in the scope2026-11-14
131ad8dbbe718b7e37b104c487152463.cloudflareworkers.comNot in the scope2026-11-14
1328a00ced5e10c25eb608c16d7ba810.cloudflareworkers.comNot in the scope2026-11-14
155e4d37887304d6db97902fb9cac8f4.cloudflareworkers.comNot in the scope2026-11-14
158c.cloudflareworkers.comNot in the scope2026-11-14
16701c37c5732da92990441b0b81f888.cloudflareworkers.comNot in the scope2026-11-14
16a4c560a7c6094ff2c5b5e93b037b2f.cloudflareworkers.comNot in the scope2026-11-14
1917c08c49beca095351599b24a0fed4.cloudflareworkers.comNot in the scope2026-11-14
19882a1e7a70450d536b787e09479158.cloudflareworkers.comNot in the scope2026-11-14
1be61d75f713506e093fb0eb23faedfc.cloudflareworkers.comNot in the scope2026-11-14
1bf4b80215ba6d5c8f349698ef95a608.cloudflareworkers.comNot in the scope2026-11-14
1e9d.cloudflareworkers.comNot in the scope2026-11-14
1fbc893c34650354438d3ab84ab8baf7.cloudflareworkers.comNot in the scope2026-11-14
1haifmtr9iuy34851mwa8dtutue8e492805acca7.cloudflareworkers.comNot in the scope2026-11-14
280aa09cf639e236723efa4b054bb7c7.2096.cloudflareworkers.comNot in the scope2026-11-14
225db1950607ef0cb6a629bbc23d5142.cloudflareworkers.comNot in the scope2026-11-14
2279c.cloudflareworkers.comNot in the scope2026-11-14
233b7c031cf8dbb9c9875623b3e85fbe.cloudflareworkers.comNot in the scope2026-11-14
237088540cb2e9e8cec8c8ecdb103cec.cloudflareworkers.comNot in the scope2026-11-14
2450c21ebd13285ce4e5ff168456768f.cloudflareworkers.comNot in the scope2026-11-14
25837f0f6ea9d7a3be9fd45dd8ba2612.cloudflareworkers.comNot in the scope2026-11-14
258ad0ab11f5ef8e720b54f0c94cc142.cloudflareworkers.comNot in the scope2026-11-14
258bcd0e7e9bb0ef83ed2fcba4039fb0.cloudflareworkers.comNot in the scope2026-11-14
279c.cloudflareworkers.comNot in the scope2026-11-14
280aa09cf639e236723efa4b054bb7c7.cloudflareworkers.comNot in the scope2026-11-14
analysis.280aa09cf639e236723efa4b054bb7c7.cloudflareworkers.comNot in the scope2026-11-14
280aa09cf639e236723efa4b054bb7c7administration.cloudflareworkers.comadminNot in the scope2026-11-14
287875487877d2f0ae9d24dd02d836d3.cloudflareworkers.comNot in the scope2026-11-14
28c397503424a06bfe06e4e0948cb1d1.cloudflareworkers.comNot in the scope2026-11-14
294b1f76f1d6c2ad84ba18846caa73ea.cloudflareworkers.comNot in the scope2026-11-14
2957acd6b3d579440dc765b72cd2843c.cloudflareworkers.comNot in the scope2026-11-14
2baf1fded65798d334160a4880874d4a.cloudflareworkers.comNot in the scope2026-11-14
2bce4b4687471a75676bba85351beaef.cloudflareworkers.comNot in the scope2026-11-14
2cdaeafa3fcc9a5aafc6c5012f549b5c.cloudflareworkers.comNot in the scope2026-11-14
2cf92d4a3da337a6c6c3bb3a64822745.cloudflareworkers.comNot in the scope2026-11-14
2d.cloudflareworkers.comNot in the scope2026-11-14
2d13b167a000f6669a67e2e642724115.cloudflareworkers.comNot in the scope2026-11-14
2d2f292200005ca2200002279c.cloudflareworkers.comNot in the scope2026-11-14
2d2f292edab1628d5ca24f4df9f2279c.cloudflareworkers.comNot in the scope2026-11-14
2dcd1cfcf32d5e75694ea8ff56a1502c.cloudflareworkers.comNot in the scope2026-11-14
2df947e6baee9502b5d496daed4d13.cloudflareworkers.comNot in the scope2026-11-14
2e74606de1151376045e5e7bfe9cb7da.cloudflareworkers.comNot in the scope2026-11-14
2ef3f23d0870e324e15a8d17b64dfc0d.cloudflareworkers.comNot in the scope2026-11-14
30149116ec78eac30e3851ff8284c622.cloudflareworkers.comNot in the scope2026-11-14
30572d6f48ae01cee1b1510b32bb0feb.cloudflareworkers.comNot in the scope2026-11-14
31407e611c45e3af311809e14c383fa2.cloudflareworkers.comNot in the scope2026-11-14
3180af31c326c13679a05f282c4fbcbb.cloudflareworkers.comNot in the scope2026-11-14
3321921e6623898ac7e8707be7b056bd.cloudflareworkers.comNot in the scope2026-11-14
33336ff3668fa1adbc27ad3934f2523a.cloudflareworkers.comNot in the scope2026-11-14
33a0c08237447c046d9aeed4ff0e43ca.cloudflareworkers.comNot in the scope2026-11-14
3440hhd15518706146fa06.cloudflareworkers.comNot in the scope2026-11-14
3440hhd82542522146fa06.cloudflareworkers.comNot in the scope2026-11-14
35738dd81504807392814b348858d5aa.cloudflareworkers.comNot in the scope2026-11-14
366d4ef9ef8b884394f48f3d49bc5e6d.cloudflareworkers.comNot in the scope2026-11-14
39305459f2c8fd8601f0a9e5fea315f8.cloudflareworkers.comNot in the scope2026-11-14
395af15091c61812adf923b4ac1dedb7.cloudflareworkers.comNot in the scope2026-11-14
39cbc906d5de00994188e1a725552d4a.cloudflareworkers.comNot in the scope2026-11-14
3a09.cloudflareworkers.comNot in the scope2026-11-14
3ae592d85a9b6bcacabf807549ef2ac8.cloudflareworkers.comNot in the scope2026-11-14
3d34901deaaa2c822c5abe562b433860.cloudflareworkers.comNot in the scope2026-11-14
3e03ef93dfd6773d1de69851beac7084.cloudflareworkers.comNot in the scope2026-11-14
4126d7446c8b8301c8e98186e8b733c6.cloudflareworkers.comNot in the scope2026-11-14
43a2ddfddd03f74a7c79b95e035d6c41.cloudflareworkers.comNot in the scope2026-11-14
43d8cf8611a02599c8bbed4c71a65630.cloudflareworkers.comNot in the scope2026-11-14
4400dde0a092.cloudflareworkers.comNot in the scope2026-11-14
44772a94f284e1adfa91d788bfa1bc45.cloudflareworkers.comNot in the scope2026-11-14
455e4d42de542225f763329b1a5edb12.cloudflareworkers.comNot in the scope2026-11-14
4615.cloudflareworkers.comNot in the scope2026-11-14
48jy84235198b21f7873078899cf5b.cloudflareworkers.comNot in the scope2026-11-14
491c96730b42bf1b643a6e9f076d8338.cloudflareworkers.comNot in the scope2026-11-14
4cc23bd81d85acf1406ee5750c568341.cloudflareworkers.comNot in the scope2026-11-14
4e045bc7a26c7f6cb9305ebf25b3c968.cloudflareworkers.comNot in the scope2026-11-14
4e04b2519648bbb3cada843a4be684ca.cloudflareworkers.comNot in the scope2026-11-14
4f9f97ca6331f0815c828e2ba0d50b4d.cloudflareworkers.comNot in the scope2026-11-14
511eaa405d9296e24d35b0fa430136f0.cloudflareworkers.comNot in the scope2026-11-14
52327839c0de4f599d68d3a138998848.cloudflareworkers.comNot in the scope2026-11-14
544eae69ec83eb641524aae5238240d7.cloudflareworkers.comNot in the scope2026-11-14
5460b33fe29cfd03874b6c2cc7e4bd18.cloudflareworkers.comNot in the scope2026-11-14
55a0c2a55a4cad8803a1a85221685a64.cloudflareworkers.comNot in the scope2026-11-14
5746684d7723bed19a649e0b083d24fe.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