CVE-2026-34906: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-4pqh-3f6p-63c5
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CWE-1336
Published
Advisory Summary

CVE-2026-34906 is a CRITICAL security vulnerability vulnerability (CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine) affecting Software libraries in the Maven ecosystem. The weakness occurs when 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.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-34906 at a Glance

CVE Identifier CVE-2026-34906
GHSA Identifier GHSA-4pqh-3f6p-63c5
Severity CRITICAL
CVSS v3.1 Base Score N/A
CWE Classification CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-34906

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-34906, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine, where 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. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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

References

NVD — CVE-2026-34906 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-34906
cert.pl/posts/2026/06/cve-2... WEB
https://cert.pl/posts/2026/06/CVE-2026-34906
simple.com.pl/branze/edukacyjna WEB
https://simple.com.pl/branze/edukacyjna

Frequently Asked Questions

What is CVE-2026-34906?
CVE-2026-34906 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-34906?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-34906?
CVE-2026-34906 is classified under CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine (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.).
How can I check Maven dependencies for CVE-2026-34906?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-4pqh-3f6p-63c5",
  "modified" : "2026-06-02T12:31:25Z",
  "published" : "2026-06-02T12:31:25Z",
  "aliases" : [ "CVE-2026-34906" ],
  "details" : "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.\n\nThis issue affects Wirtualna Uczelnia versions up to wu#2016.437.295#0#20260327_105545",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-34906"
  }, {
    "type" : "WEB",
    "url" : "https://cert.pl/posts/2026/06/CVE-2026-34906"
  }, {
    "type" : "WEB",
    "url" : "https://simple.com.pl/branze/edukacyjna"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1336" ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-06-02T10:16:22Z"
  }
}