CVE-2026-26927 URL (HTTP Origin) call location spoofing in Szafir SDK Web
Attackers can spoof the origin URL in Szafir SDK Web to bypass confirmation prompts and execute arbitrary code via SzafirHost.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-26927?
CVE-2026-26927 is a medium-severity vulnerability in Krajowa Izba Rozliczeniowa Szafir SDK Web, published on 2 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-348
Which versions are affected by CVE-2026-26927?
How do I fix CVE-2026-26927?
No fix has been published for CVE-2026-26927 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-26927 being exploited?
There is no known exploitation of CVE-2026-26927 in the wild and no public exploit code.
Sources
Also known as GHSA-v88m-g39w-9rgh.