What’s Vulnerable › Vulnerabilities

CVE-2026-34906: Server-Side Template Injection (SSTI) in Wirtualna Uczelnia

• Severity: critical (CVSS 9.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-02 · updated 2026-07-22
• Weakness: CWE-1336

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

Affected products

• Simple SA Wirtualna Uczelnia: through wu#2016.437.295#0#20260327_105545

References

• https://cert.pl/posts/2026/06/CVE-2026-34906
• https://simple.com.pl/branze/edukacyjna/

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