Krajowa Izba Rozliczeniowa SzafirHost up to 1.2.0 JAR File unrestricted upload

Summaryinfo

A vulnerability has been found in Krajowa Izba Rozliczeniowa SzafirHost up to 1.2.0 and classified as critical. This affects an unknown part of the component JAR File Handler. The manipulation leads to unrestricted upload. This vulnerability is uniquely identified as CVE-2026-44088. The attack is possible to be carried out remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Krajowa Izba Rozliczeniowa SzafirHost up to 1.2.0. It has been rated as critical. This issue affects an unknown part of the component JAR File Handler. The manipulation with an unknown input leads to a unrestricted upload vulnerability. Using CWE to declare the problem leads to CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

SzafirHost verifies the signature of the downloaded JAR file using class JarInputStream (reading from the beginning of the file), but loads classes using class JarFile/URLClassLoader (reading the Central Directory from the end). It can lead to remote code execution by allowing an attacker to combine a genuine, signed JAR file with a malicious ZIP file, causing the verification to pass but the malicious class to be loaded. This issue was fixed in version 1.2.1.

The weakness was disclosed by Mariusz Maik. The advisory is shared at cert.pl. The identification of this vulnerability is CVE-2026-44088 since 05/05/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1608.002 for this issue.

Upgrading to version 1.2.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-30512). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• Krajowa Izba Rozliczeniowa

Name

• SzafirHost

Version

• 1.0
• 1.1
• 1.2.0

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CPE 2.2info

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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