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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
24,296
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 Problem#1952124No weakness recorded2023-06-07$3,30097
Using special IPv4-mapped IPv6 addresses to bypass local IP ban#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 Forwarding#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 it#3211031Cross-site Scripting2025-09-30$55075
Yet Another CASB Integration Takeover of Active Integrations#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 AccessTempAuth#3423950Cross-site Scripting2026-04-14–63
AI Playground XSS to steal user-chat messages and access to connected MCP Server#3424998Cross-site Scripting2026-02-26–62
Bypass R2 payment screen#2170559Authentication2023-11-10$35057

Subdomains24,296

Root
Scope
Name suggests
First seen
Text file24,296 names
Subdomains of Cloudflare Public Bug Bounty
NameScopeFirst seen
linglem.altervista.org.cdn.cloudflare.comIn scope2026-11-14
ritaterzaelementare.altervista.org.cdn.cloudflare.comIn scope2026-11-14
preview-amp-dev.cdn.cloudflare.comdev, stagingIn scope2026-11-14
swift--track-glitch-me.cdn.cloudflare.comIn scope2026-11-14
atmpj.tw.cdn.cloudflare.comIn scope2026-11-14
bgrgcf.tw.cdn.cloudflare.comIn scope2026-11-14
coljp.tw.cdn.cloudflare.comIn scope2026-11-14
www.f7j0.tw.cdn.cloudflare.comIn scope2026-11-14
isiuw.tw.cdn.cloudflare.comIn scope2026-11-14
www.jcpks.tw.cdn.cloudflare.comIn scope2026-11-14
www.kffpn.tw.cdn.cloudflare.comIn scope2026-11-14
www.leddj.tw.cdn.cloudflare.comIn scope2026-11-14
mfpcg.tw.cdn.cloudflare.comIn scope2026-11-14
spltn.tw.cdn.cloudflare.comIn scope2026-11-14
www.wmxbb.tw.cdn.cloudflare.comIn scope2026-11-14
www.wzsvp.tw.cdn.cloudflare.comIn scope2026-11-14
zlnvl.tw.cdn.cloudflare.comIn scope2026-11-14
cf-protected-handgloves.geenius.co.uk.cdn.cloudflare.comIn scope2026-11-14
www.marketingbydesign.co.uk.cdn.cloudflare.comIn scope2026-11-14
cf-protected-www.annapolisvalleynews.com.cdn5-197.cloudflare.comIn scope2026-11-14
cdnbillo.cloudflare.comIn scope2026-11-14
cdncss.cloudflare.comIn scope2026-11-14
cdngs.cloudflare.comIn scope2026-11-14
cdnis.cloudflare.comIn scope2026-11-14
cdnj.cloudflare.comIn scope2026-11-14
cdnjd.cloudflare.comIn scope2026-11-14
cdnjlas.cloudflare.comIn scope2026-11-14
cdnjs.cloudflare.comIn scope2026-11-14
cdnjs-staging.cloudflare.comstagingIn scope2026-11-14
www.cdnjs.cloudflare.comIn scope2026-11-14
cdnjs1.cloudflare.comIn scope2026-11-14
cdnjs3.cloudflare.comIn scope2026-11-14
cdnjsf.cloudflare.comIn scope2026-11-14
cdnjsg.cloudflare.comIn scope2026-11-14
cdnjsss.cloudflare.comIn scope2026-11-14
cdnnjs.cloudflare.comIn scope2026-11-14
cdns.cloudflare.comIn scope2026-11-14
ced.cloudflare.comIn scope2026-11-14
middlecache.ced.cloudflare.comIn scope2026-11-14
certifications.cloudflare.comIn scope2026-11-14
admin.certifications.cloudflare.comadminIn scope2026-11-14
staging.admin.certifications.cloudflare.comadmin, stagingIn scope2026-11-14
staging.certifications.cloudflare.comstagingIn scope2026-11-14
certvalidate.cloudflare.comIn scope2026-11-14
certvalidate-staging.cloudflare.comstagingIn scope2026-11-14
cf-162-158-64-226.cloudflare.comIn scope2026-11-14
cf-162-159-8-133.cloudflare.comIn scope2026-11-14
cf-162-159-9-204.cloudflare.comIn scope2026-11-14
cf-173-245-48-100.cloudflare.comIn scope2026-11-14
cf-173-245-48-101.cloudflare.comIn scope2026-11-14
cf-173-245-48-102.cloudflare.comIn scope2026-11-14
cf-173-245-48-103.cloudflare.comIn scope2026-11-14
cf-173-245-48-104.cloudflare.comIn scope2026-11-14
cf-173-245-48-105.cloudflare.comIn scope2026-11-14
cf-173-245-48-106.cloudflare.comIn scope2026-11-14
cf-173-245-48-107.cloudflare.comIn scope2026-11-14
cf-173-245-48-108.cloudflare.comIn scope2026-11-14
cf-173-245-48-109.cloudflare.comIn scope2026-11-14
cf-173-245-48-11.cloudflare.comIn scope2026-11-14
cf-173-245-48-110.cloudflare.comIn scope2026-11-14
cf-173-245-48-111.cloudflare.comIn scope2026-11-14
cf-173-245-48-112.cloudflare.comIn scope2026-11-14
cf-173-245-48-113.cloudflare.comIn scope2026-11-14
cf-173-245-48-114.cloudflare.comIn scope2026-11-14
cf-173-245-48-115.cloudflare.comIn scope2026-11-14
cf-173-245-48-116.cloudflare.comIn scope2026-11-14
cf-173-245-48-117.cloudflare.comIn scope2026-11-14
cf-173-245-48-118.cloudflare.comIn scope2026-11-14
cf-173-245-48-119.cloudflare.comIn scope2026-11-14
cf-173-245-48-12.cloudflare.comIn scope2026-11-14
cf-173-245-48-120.cloudflare.comIn scope2026-11-14
cf-173-245-48-121.cloudflare.comIn scope2026-11-14
cf-173-245-48-122.cloudflare.comIn scope2026-11-14
cf-173-245-48-123.cloudflare.comIn scope2026-11-14
cf-173-245-48-124.cloudflare.comIn scope2026-11-14
cf-173-245-48-125.cloudflare.comIn scope2026-11-14
cf-173-245-48-126.cloudflare.comIn scope2026-11-14
cf-173-245-48-127.cloudflare.comIn scope2026-11-14
cf-173-245-48-128.cloudflare.comIn scope2026-11-14
cf-173-245-48-129.cloudflare.comIn scope2026-11-14
cf-173-245-48-13.cloudflare.comIn scope2026-11-14
cf-173-245-48-130.cloudflare.comIn scope2026-11-14
cf-173-245-48-131.cloudflare.comIn scope2026-11-14
cf-173-245-48-132.cloudflare.comIn scope2026-11-14
cf-173-245-48-133.cloudflare.comIn scope2026-11-14
cf-173-245-48-134.cloudflare.comIn scope2026-11-14
cf-173-245-48-135.cloudflare.comIn scope2026-11-14
cf-173-245-48-136.cloudflare.comIn scope2026-11-14
cf-173-245-48-137.cloudflare.comIn scope2026-11-14
cf-173-245-48-138.cloudflare.comIn scope2026-11-14
cf-173-245-48-139.cloudflare.comIn scope2026-11-14
cf-173-245-48-14.cloudflare.comIn scope2026-11-14
cf-173-245-48-140.cloudflare.comIn scope2026-11-14
cf-173-245-48-141.cloudflare.comIn scope2026-11-14
cf-173-245-48-142.cloudflare.comIn scope2026-11-14
cf-173-245-48-143.cloudflare.comIn scope2026-11-14
cf-173-245-48-144.cloudflare.comIn scope2026-11-14
cf-173-245-48-145.cloudflare.comIn scope2026-11-14
cf-173-245-48-146.cloudflare.comIn scope2026-11-14
cf-173-245-48-147.cloudflare.comIn scope2026-11-14

18,933 names are covered by the program's own scope; 0 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 2026-11-14.

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