Directory Traversal in Srimax Output Messenger
CVE-2025-27920 is a directory traversal vulnerability in Srimax Output Messenger affecting version 2.0.62 and earlier releases before 2.0.63. The flaw is caused by improper file path handling in the application, where attacker-controlled path input containing "../" sequences is not properly restricted to the intended directory. Available reporting indicates the issue is reachable through Output Messenger server functionality, including the Server Manager and file-sharing/upload workflow, allowing an authenticated attacker to access files outside the expected directory boundary. Microsoft reporting further indicates the flaw can be used to upload arbitrary files into the server startup directory, enabling execution of attacker-controlled payloads. In observed exploitation, the vulnerability was used to place VBS scripts and Golang backdoors such as OMServerService.exe and OMClientService.exe on victim systems.
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Impact, mitigation & remediation
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Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
30 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A directory traversal vulnerability in Srimax Output Messenger that can allow unauthorized access to sensitive files on affected servers.
A directory traversal vulnerability in Output Messenger (version 2.0.62) that allows remote attackers to access or execute arbitrary files. Exploited as a zero-day by the Marbled Dust threat actor for cyber espionage.
An authenticated directory traversal vulnerability in Output Messenger (noted in v2.0.62) that can allow access to or execution of arbitrary files outside intended directories, enabling follow-on compromise via dropped payloads.
A directory traversal vulnerability in Output Messenger (notably v2.0.62) that can be abused (with authentication/compromised credentials) to access sensitive files and enable remote code execution via arbitrary file access/upload into sensitive server directories (e.g., startup directory).
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.