CVE-2026-34906 Server-Side Template Injection (SSTI) in Wirtualna Uczelnia
Unauthenticated attackers can achieve remote code execution via server-side template injection in the redirect URL parameter.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-34906?
CVE-2026-34906 is a critical code injection vulnerability in Simple SA Wirtualna Uczelnia, published on 2 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Server-Side Template Injection (SSTI) in Wirtualna Uczelnia allows an unauthenticated attacker to perform Remote Code Execution (RCE). In the endpoint redirectToUrl and parameter redirectUrlParameter, insufficient input validation permits injection of arbitrary template expressions that are executed on the server. Successful exploitation can allow an attacker to run remote commands, including establishing a reverse shell.
This issue affects Wirtualna Uczelnia versions up to wu#2016.437.295#0#20260327_105545
Weakness: CWE-1336
Which versions are affected by CVE-2026-34906?
How do I fix CVE-2026-34906?
No fix has been published for CVE-2026-34906 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-34906 being exploited?
There is no known exploitation of CVE-2026-34906 in the wild and no public exploit code.
Sources
Also known as GHSA-4pqh-3f6p-63c5.