Attachment protection bypass via missing Mark-of-the-Web
Published Dec 16, 2025 · Updated Dec 16, 2025
Protection mechanism failure in Blue Mail 1.140.103 and earlier allows remote attackers to bypass Windows attachment safeguards. The attachment interaction feature writes documents to the file system without applying the Mark-of-the-Web tag. Exploitation requires a recipient to open a malicious document through Open with or Save as; the missing tag suppresses downstream protections, enabling exploitation of a vulnerable document handler.
Summary
What happened
Protection mechanism failure in Blue Mail 1.140.103 and earlier allows remote attackers to bypass Windows attachment safeguards. The attachment interaction feature writes documents to the file system without applying the Mark-of-the-Web tag. Exploitation requires a recipient to open a malicious document through Open with or Save as; the missing tag suppresses downstream protections, enabling exploitation of a vulnerable document handler.
The record
- CVE
- CVE-2025-65319
- Published
- Dec 16, 2025
- Updated
- Dec 16, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-693, T1204.002
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 16, 2025CVE publishedPublication date reported by the CVE source.
- Dec 16, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
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
- Blue Mail malicious attachment proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo