Simple SA Wirtualna Uczelnia up to wu#2016.437.295#0#20260327_105545 Endpoint redirectToUrl redirectUrlParameter special elements used in a template engine

Summaryinfo

A vulnerability classified as critical has been found in Simple SA Wirtualna Uczelnia up to wu#2016.437.295#0#20260327_105545. Affected is the function redirectToUrl of the component Endpoint. Performing a manipulation of the argument redirectUrlParameter results in improper neutralization of special elements used in a template engine. This vulnerability is known as CVE-2026-34906. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability, which was classified as critical, was found in Simple SA Wirtualna Uczelnia up to wu#2016.437.295#0#20260327_105545. This affects the function redirectToUrl of the component Endpoint. The manipulation of the argument redirectUrlParameter with an unknown input leads to a improper neutralization of special elements used in a template engine vulnerability. CWE is classifying the issue as CWE-1336. The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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

The weakness was published by Dawid Bakaj. The advisory is shared at cert.pl. This vulnerability is uniquely identified as CVE-2026-34906 since 03/31/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/02/2026). MITRE ATT&CK project uses the attack technique T1221 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Simple SA

Name

• Wirtualna Uczelnia

Version

• wu#2016.437.295#0#20260327_105545

CPE 2.3info

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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