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curl: Cross-protocol redirect to imap:// or smtp:// uploads the -F/MIMEPOST form and the custom Authorization/Cookie headers to the redirect target

🗓️ 17 Oct 2026 22:05:53Reported by sujitjaunjalType 
hackerone
 hackerone🔗 hackerone.com👁 4 Views

libcurl cross-protocol redirect to imap:// or smtp:// leaks MIMEPOST form and headers.

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26 Oct 2026 12:50Current
6.5Medium risk
Vulners AI Score6.5
CVSS 25
CVSS 3.15.3 - 9.8
EPSS0.09906
SSVC
libcurlcross-protocol redirectimap://smtp://MIMEPOSTAuthorization header
4