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Weakness (CWE)

CWE-917: Improper Neutralization of Special Elements used in an Expression Language Statement

Base Incomplete

The product constructs all or part of an expression language (EL) statement in a framework such as a Java Server Page (JSP) using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended EL statement before it is executed.

How to prevent it (3 mitigations)

  1. Architecture and Design

    Avoid adding user-controlled data into an expression interpreter when possible.

  2. Implementation

    If user-controlled data must be added to an expression interpreter, one or more of the following should be performed:

    - Validate that the user input will not evaluate as an expression

    - Encode the user input in a way that ensures it is not evaluated as an expression

  3. System Configuration, Operation

    The framework or tooling might allow the developer to disable or deactivate the processing of EL expressions, such as setting the isELIgnored attribute for a JSP page to "true".

Source: MITRE CWE-917

All Critical High Medium Low Exploited only Public exploit

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  • High 8.8
    CVE-2026-83531 Public exploit

    Apache Camel: Camel-Dynamic-Router Control Endpoint Compiles Predicate Expressions Supplied by Control Messages

    Improper Control of Generation of Code ('Code Injection'), Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection') vulnerability in Apache Camel. This issue affects Apache Camel: from 4.4.0 before…

    Apache Software Foundation Apache Camel
  • High 8.9
    CVE-2026-65591 Public exploit

    n8n before 1.123.64 Sanitizer Bypass Remote Code Execution

    n8n contains a sanitizer bypass vulnerability in the legacy expression evaluator's computed-member handler. An authenticated user with workflow create or modify permissions can craft a malicious expression to bypass the sanitizer and achieve host-level code e…

    n8n-io n8n n8n npm
  • High 8.1
    CVE-2026-41729 Public exploit

    Spring Data REST SpEL Injection via Map Key in JSON Patch

    Spring Data REST is vulnerable to SpEL expression injection through map-typed properties when processing JSON Patch (application/json-patch+json) requests. When a persistent entity exposes a Map-typed property, the JSON Pointer path segment used as the map ke…

    Spring Spring Data REST org.springframework.data:spring-data-rest-core Maven
  • High 8.8
    CVE-2026-40897 Public exploit

    Math.js: Unsafe object property setter in mathjs

    Math.js is an extensive math library for JavaScript and Node.js. From 13.1.1 to before 15.2.0, a vulnerability allowed executing arbitrary JavaScript via the expression parser of mathjs. You can be affected when you have an application where users can evaluat…

    josdejong mathjs mathjs npm
  • High 8.8
    CVE-2020-10199 Exploited Public exploit EPSS 99%

    Nexus Repository Manager 3 - Remote Code Execution

    Sonatype Nexus Repository before 3.21.2 allows JavaEL Injection (issue 1 of 2).

    org.sonatype.nexus:nexus-extdirect Maven
    KEV Nov 3, 2021
  • High 8.8
    CVE-2010-1871 Exploited Public exploit EPSS 83%

    JBoss Seam 2 (jboss-seam2), as used in JBoss Enterprise Application Platform 4.3.0 for Red Hat Linux, does not properly…

    KEV Dec 10, 2021