Krajowa Izba Rozliczeniowa Szafir SDK Web prior 0.0.17.4 document_base_url less trusted source

Summaryinfo

A vulnerability, which was classified as problematic, was found in Krajowa Izba Rozliczeniowa Szafir SDK Web. This vulnerability affects unknown code. Executing a manipulation of the argument document_base_url can lead to less trusted source. The identification of this vulnerability is CVE-2026-26927. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in Krajowa Izba Rozliczeniowa Szafir SDK Web and classified as problematic. This vulnerability affects some unknown functionality. The manipulation of the argument document_base_url with an unknown input leads to a less trusted source vulnerability. The CWE definition for the vulnerability is CWE-348. The product has two different sources of the same data or information, but it uses the source that has less support for verification, is less trusted, or is less resistant to attack. As an impact it is known to affect integrity. CVE summarizes:

Szafir SDK Web is a browser plug-in that can run SzafirHost application which download the necessary files when launched. In Szafir SDK Web it is possible to change the URL (HTTP Origin) of the application call location. An unauthenticated attacker can craft a website that is able to launch SzafirHost application with arbitrary arguments via Szafir SDK Web browser addon. No validation will be performed to check whether the address specified in `document_base_url` parameter is in any way related to the actual address of the calling web application. The URL address specified in `document_base_url` parameter is then shown in the application confirmation prompt. When a victim confirms the execution of the application, it will be called in the context of attacker's website URL and might download additional files and libraries from that website. When victim accepts the application execution for the URL showed in the confirmation prompt with the "remember" option before, the prompt won't be shown and the application will be called in the context of URL provided by the attacker without any interaction. This issue was fixed in version 0.0.17.4.

The weakness was shared by Michał Leszczyński. The advisory is available at cert.pl. This vulnerability was named CVE-2026-26927 since 02/16/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

Upgrading to version 0.0.17.4 eliminates this vulnerability.

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Vendor

• Krajowa Izba Rozliczeniowa

Name

• Szafir SDK Web

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CPE 2.2info

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