CVE-2026-5131: CWE-918 Server-Side Request Forgery (SSRF) in Nomios Poland GREENmod
GREENmod uses named pipes for communication between plugins, the web portal, and the system service, but the access control lists for these pipes are configured incorrectly. This allows an attacker to communicate with the stream and upload any XML or JSON file, which will be processed by the named pipe with the privileges of the user under whose context the service is running. This allows for Server-Side Request Forgery to any Windows system on which the agent is installed and which provides communication via SMB or WebDav. This issue was fixed in version 2.8.33.
AI Analysis
Technical Summary
GREENmod uses named pipes for communication between plugins, the web portal, and the system service. Due to improper access control list configuration on these pipes, an attacker can communicate with the stream and upload arbitrary XML or JSON files. These files are processed with the privileges of the user running the service, enabling Server-Side Request Forgery (CWE-918) to any Windows system hosting the agent that exposes SMB or WebDav communication. The vulnerability is identified as CVE-2026-5131 and has a CVSS 4.0 base score of 6.9 (medium severity). The issue was fixed in GREENmod version 2.8.33.
Potential Impact
An attacker can leverage this vulnerability to perform SSRF attacks on Windows systems where the GREENmod agent is installed. This could allow unauthorized requests to internal services accessible via SMB or WebDav, potentially leading to unauthorized access or actions performed with the privileges of the service user. The vulnerability affects all versions prior to 2.8.33.
Mitigation Recommendations
This vulnerability is fixed in GREENmod version 2.8.33. Users should upgrade to version 2.8.33 or later to remediate this issue. There is no indication of alternative mitigations or temporary fixes. Patch status is confirmed by the vendor advisory stating the fix in version 2.8.33.
CVE-2026-5131: CWE-918 Server-Side Request Forgery (SSRF) in Nomios Poland GREENmod
Description
GREENmod uses named pipes for communication between plugins, the web portal, and the system service, but the access control lists for these pipes are configured incorrectly. This allows an attacker to communicate with the stream and upload any XML or JSON file, which will be processed by the named pipe with the privileges of the user under whose context the service is running. This allows for Server-Side Request Forgery to any Windows system on which the agent is installed and which provides communication via SMB or WebDav. This issue was fixed in version 2.8.33.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
GREENmod uses named pipes for communication between plugins, the web portal, and the system service. Due to improper access control list configuration on these pipes, an attacker can communicate with the stream and upload arbitrary XML or JSON files. These files are processed with the privileges of the user running the service, enabling Server-Side Request Forgery (CWE-918) to any Windows system hosting the agent that exposes SMB or WebDav communication. The vulnerability is identified as CVE-2026-5131 and has a CVSS 4.0 base score of 6.9 (medium severity). The issue was fixed in GREENmod version 2.8.33.
Potential Impact
An attacker can leverage this vulnerability to perform SSRF attacks on Windows systems where the GREENmod agent is installed. This could allow unauthorized requests to internal services accessible via SMB or WebDav, potentially leading to unauthorized access or actions performed with the privileges of the service user. The vulnerability affects all versions prior to 2.8.33.
Mitigation Recommendations
This vulnerability is fixed in GREENmod version 2.8.33. Users should upgrade to version 2.8.33 or later to remediate this issue. There is no indication of alternative mitigations or temporary fixes. Patch status is confirmed by the vendor advisory stating the fix in version 2.8.33.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- CERT-PL
- Date Reserved
- 2026-03-30T09:39:43.884Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69e216a682d89c981fce584a
Added to database: 4/17/2026, 11:16:54 AM
Last enriched: 4/17/2026, 11:31:54 AM
Last updated: 4/17/2026, 1:39:07 PM
Views: 7
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