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CVE-2026-26927— URL (HTTP Origin) call location spoofing in Szafir SDK Web

Quick assessment

Affected
Krajowa Izba Rozliczeniowa Szafir SDK Web
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Krajowa Izba Rozliczeniowa Szafir SDK Web是波兰Krajowa Izba Rozliczeniowa公司的一款电子签名与身份认证开发工具包。 Krajowa Izba Rozliczeniowa Szafir SDK Web 0.0.17.4之前版本存在安全漏洞，该漏洞源于未验证document_base_url参数，可能导致未经验证的攻击者通过特制网站启动应用程序并下载任意文件。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.27% · P18
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I. Basic Information for CVE-2026-26927

Vulnerability Information
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Vulnerability Title
URL (HTTP Origin) call location spoofing in Szafir SDK Web
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用不可信的源
Source: CVE Program / CVE List V5
Vulnerability Title
Krajowa Izba Rozliczeniowa Szafir SDK Web 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Krajowa Izba Rozliczeniowa Szafir SDK Web是波兰Krajowa Izba Rozliczeniowa公司的一款电子签名与身份认证开发工具包。 Krajowa Izba Rozliczeniowa Szafir SDK Web 0.0.17.4之前版本存在安全漏洞，该漏洞源于未验证document_base_url参数，可能导致未经验证的攻击者通过特制网站启动应用程序并下载任意文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Krajowa Izba Rozliczeniowa Szafir SDK Web 0 ~ 0.0.17.4 -

II. Public POCs for CVE-2026-26927

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III. Intelligence Information for CVE-2026-26927

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Security Blog Posts for CVE-2026-26927 (1)

IV. Related Vulnerabilities

Same vendor: Krajowa Izba Rozliczeniowa
Same weakness: CWE-348

V. Comments for CVE-2026-26927

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