EUVD-2026-20884
GHSA-hh72-xj72-2c38
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from Vendor (CERT-PL) · only source for this CVE.
CVSS VectorVendor: CERT-PL
Lifecycle Timeline
7DescriptionCVE.org
Hydrosystem Control System does not enforce authorization for some directories. This allows an unauthorized attacker to read all files in these directories and even execute some of them. Critically the attacker could run PHP scripts directly on the connected database.This issue was fixed in Hydrosystem Control System version 9.8.5
AnalysisAI
Unauthorized access to directories in Hydrosystem Control System versions prior to 9.8.5 allows unauthenticated remote attackers to read arbitrary files and execute PHP scripts directly against the connected database. Missing authorization enforcement on specific directories enables direct file access and code execution without authentication, creating critical exposure for database manipulation and data exfiltration. No public exploit identified at time of analysis.
Technical ContextAI
CWE-862 missing authorization vulnerability permits direct filesystem access to unprotected directories. CVSS vector PR:N confirms unauthenticated network-based exploitation. Vulnerability allows PHP script execution with database access privileges, bypassing application-layer access controls entirely through direct file requests.
RemediationAI
Vendor-released patch: Hydrosystem Control System version 9.8.5. Immediately upgrade all instances to version 9.8.5 or later to enforce proper directory-level authorization controls. Until patching is completed, implement network-level access restrictions to limit exposure exclusively to authenticated administrative networks using firewall rules or VPN requirements. Review web server configuration to explicitly deny direct access to PHP files outside designated application entry points. Conduct database access log review for unauthorized query activity. Reference vendor advisory at https://www.hydrosystem.poznan.pl/ and detailed analysis at https://cert.pl/posts/2026/04/CVE-2026-4901/ for implementation guidance.
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Same weakness CWE-862 – Missing Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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