Vulnerability · Published Apr 17, 2026 · Assigned by CERT-PL

CVE-2026-5131Server-Side Request Forgery in GREENmod

Medium 6.9

In plain English

A medium-severity server-side request forgery in GREENmod from Nomios Poland. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities).

Severity (CVSS 4.0)6.9Medium

Exploit odds (30 days)0.4%top 63.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Nomios Poland	GREENmod	0 – before 2.8.33

Weakness: CWE-918 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L

References

https://www.nomios.pl/greenmod/ product
https://cert.pl/posts/2026/04/CVE-2026-5131 third-party-advisory