EUVD-2026-31401
Unrestricted Upload of File with Dangerous Type (CWE-434)
GHSA-38r3-cgcv-g3qp
6.9
CVSS 4.0
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CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:N/R:A/V:X/RE:L/U:Amber
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
A
Scope
X
Lifecycle Timeline
3
Analysis Generated
May 22, 2026 - 05:46 vuln.today
CVSS changed
May 22, 2026 - 04:22 NVD
6.9 (MEDIUM)
CVE Published
May 22, 2026 - 02:57 nvd
UNKNOWN (no severity yet)
DescriptionNVD
Mothra would respect a default value given by a website for HTML file upload forms. An attacker could craft a website with a malicious default file path, and then conceal this form element.
AnalysisAI
File disclosure via malicious HTML file upload default values in Mothra, the web browser bundled with the 9front Plan 9 fork, allows a remote unauthenticated attacker to exfiltrate arbitrary local files from a victim's filesystem. By crafting a webpage containing a hidden file input element with a pre-set malicious default path, the attacker can cause Mothra to silently submit a targeted local file to an attacker-controlled server upon user interaction. …
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External POC / Exploit Code
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