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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:cloudflareaccess.com
Scope
Name suggests
First seen
Text fileClear filters4,882 names
Subdomains of Cloudflare Public Bug Bounty
NameScopeFirst seen
0.cloudflareaccess.comNot in the scope2026-11-14
00-0000.cloudflareaccess.comNot in the scope2026-11-14
06622101cmp4.cloudflareaccess.comNot in the scope2026-11-14
07zr.cloudflareaccess.comNot in the scope2026-11-14
0bsnetwork.cloudflareaccess.comNot in the scope2026-11-14
0link.cloudflareaccess.comNot in the scope2026-11-14
0x31337.cloudflareaccess.comNot in the scope2026-11-14
0x6c59.cloudflareaccess.comNot in the scope2026-11-14
0xaaaa.cloudflareaccess.comNot in the scope2026-11-14
1.cloudflareaccess.comNot in the scope2026-11-14
1111.cloudflareaccess.comNot in the scope2026-11-14
11880.cloudflareaccess.comNot in the scope2026-11-14
11ts-e-com.cloudflareaccess.comNot in the scope2026-11-14
11ty-matttunney-co-uk-pages.cloudflareaccess.comNot in the scope2026-11-14
121971.cloudflareaccess.comNot in the scope2026-11-14
123.cloudflareaccess.comNot in the scope2026-11-14
12oss.cloudflareaccess.comNot in the scope2026-11-14
13b.cloudflareaccess.comNot in the scope2026-11-14
140814.cloudflareaccess.comNot in the scope2026-11-14
15net.cloudflareaccess.comNot in the scope2026-11-14
1776consulting.cloudflareaccess.comNot in the scope2026-11-14
180smoke.cloudflareaccess.comNot in the scope2026-11-14
1inch.cloudflareaccess.comNot in the scope2026-11-14
1kms.cloudflareaccess.comNot in the scope2026-11-14
1s1k.cloudflareaccess.comNot in the scope2026-11-14
2112staging.cloudflareaccess.comstagingNot in the scope2026-11-14
221london.cloudflareaccess.comNot in the scope2026-11-14
23andme.cloudflareaccess.comNot in the scope2026-11-14
24slides.cloudflareaccess.comNot in the scope2026-11-14
2am-media-my.cloudflareaccess.comNot in the scope2026-11-14
2keep.cloudflareaccess.comNot in the scope2026-11-14
2link.cloudflareaccess.comNot in the scope2026-11-14
2qsw3uxp.cloudflareaccess.comNot in the scope2026-11-14
300mediahub.cloudflareaccess.comNot in the scope2026-11-14
321ignition.cloudflareaccess.comNot in the scope2026-11-14
360xag.cloudflareaccess.comNot in the scope2026-11-14
3almad3aka.cloudflareaccess.comNot in the scope2026-11-14
3bmeteo.cloudflareaccess.comNot in the scope2026-11-14
3cs.cloudflareaccess.comNot in the scope2026-11-14
3ctech.cloudflareaccess.comNot in the scope2026-11-14
3cx.cloudflareaccess.comNot in the scope2026-11-14
3danet.cloudflareaccess.comNot in the scope2026-11-14
42codelab.cloudflareaccess.comNot in the scope2026-11-14
4573.cloudflareaccess.comNot in the scope2026-11-14
4958234.cloudflareaccess.comNot in the scope2026-11-14
4ba.cloudflareaccess.comNot in the scope2026-11-14
4v0.cloudflareaccess.comNot in the scope2026-11-14
4ventos.cloudflareaccess.comNot in the scope2026-11-14
51b.cloudflareaccess.comNot in the scope2026-11-14
555dbpubsend555.cloudflareaccess.comNot in the scope2026-11-14
5mck.cloudflareaccess.comNot in the scope2026-11-14
617webmarketing.cloudflareaccess.comNot in the scope2026-11-14
68n5zi5jz.cloudflareaccess.comNot in the scope2026-11-14
6f6e757a.cloudflareaccess.comNot in the scope2026-11-14
6mind.cloudflareaccess.comNot in the scope2026-11-14
774094660.cloudflareaccess.comNot in the scope2026-11-14
79bits.cloudflareaccess.comNot in the scope2026-11-14
7assets.cloudflareaccess.comNot in the scope2026-11-14
7group.cloudflareaccess.comNot in the scope2026-11-14
7lab.cloudflareaccess.comNot in the scope2026-11-14
7solid.cloudflareaccess.comNot in the scope2026-11-14
7themeadows.cloudflareaccess.comNot in the scope2026-11-14
80000hours.cloudflareaccess.comNot in the scope2026-11-14
83749273.cloudflareaccess.comNot in the scope2026-11-14
8x8com.cloudflareaccess.comNot in the scope2026-11-14
901tech.cloudflareaccess.comNot in the scope2026-11-14
96r6tdpz.cloudflareaccess.comNot in the scope2026-11-14
996workers.cloudflareaccess.comNot in the scope2026-11-14
9cfc059b-849d-4788-8dfc-80049129635e.cloudflareaccess.comNot in the scope2026-11-14
9channel.cloudflareaccess.comNot in the scope2026-11-14
9gaginc.cloudflareaccess.comNot in the scope2026-11-14
9giga.cloudflareaccess.comNot in the scope2026-11-14
9lives.cloudflareaccess.comNot in the scope2026-11-14
9minecraft.cloudflareaccess.comNot in the scope2026-11-14
_cisco-uds.cloudflareaccess.comNot in the scope2026-11-14
_collab-edge.cloudflareaccess.comNot in the scope2026-11-14
_cuplogin.cloudflareaccess.comNot in the scope2026-11-14
_dmarc.cloudflareaccess.comNot in the scope2026-11-14
_etcd-server-ssl.cloudflareaccess.comNot in the scope2026-11-14
_mta-sts.cloudflareaccess.comNot in the scope2026-11-14
_cisco-uds._tcp.cloudflareaccess.comNot in the scope2026-11-14
_cuplogin._tcp.cloudflareaccess.comNot in the scope2026-11-14
_tls.cloudflareaccess.comNot in the scope2026-11-14
_collab-edge._tls.cloudflareaccess.comNot in the scope2026-11-14
a.cloudflareaccess.comNot in the scope2026-11-14
a4b.cloudflareaccess.comNot in the scope2026-11-14
a8hosting.cloudflareaccess.comNot in the scope2026-11-14
a8ym7amb.cloudflareaccess.comNot in the scope2026-11-14
a99.cloudflareaccess.comNot in the scope2026-11-14
aaa744a0b99b429f6c41.cloudflareaccess.comNot in the scope2026-11-14
aaaaaaaesfe.cloudflareaccess.comNot in the scope2026-11-14
aae.cloudflareaccess.comNot in the scope2026-11-14
aagiftsandbaskets.cloudflareaccess.comNot in the scope2026-11-14
aandyconstruction.cloudflareaccess.comNot in the scope2026-11-14
aanp.cloudflareaccess.comNot in the scope2026-11-14
aarcarr.cloudflareaccess.comNot in the scope2026-11-14
aaroncheah326.cloudflareaccess.comNot in the scope2026-11-14
abelinkinbio.cloudflareaccess.comNot in the scope2026-11-14
abellio.cloudflareaccess.comNot in the scope2026-11-14
abg.cloudflareaccess.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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