Unauthenticated file upload via missing MIME validation
Published Aug 20, 2025 · Updated Sep 17, 2025
Unrestricted file upload in affected Liferay Portal and DXP releases allows remote attackers to store files through guest form attachments. UploadFileEntryMVCActionCommand derived a MIME type from the uploaded file and name but passed it to storage without validating it against the site's allowed MIME types. Guest access is sufficient; extension obfuscation bypasses the existing extension check, while downstream processing or user interaction is required for confidentiality or integrity effects.
Summary
What happened
Unrestricted file upload in affected Liferay Portal and DXP releases allows remote attackers to store files through guest form attachments. UploadFileEntryMVCActionCommand derived a MIME type from the uploaded file and name but passed it to storage without validating it against the site's allowed MIME types. Guest access is sufficient; extension obfuscation bypasses the existing extension check, while downstream processing or user interaction is required for confidentiality or integrity effects.
The record
- CVE
- CVE-2025-43750
- Published
- Aug 20, 2025
- Updated
- Sep 17, 2025
- Vendor
- Liferay
- Product
- Liferay Portal
- Classifications
- CWE-434, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 20, 2025CVE publishedPublication date reported by the CVE source.
- Sep 17, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=7.4.0 <=7.4.3.132
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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