Weakness (CWE)
CWE-917: Improper Neutralization of Special Elements used in an Expression Language Statement
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)
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Architecture and Design
Avoid adding user-controlled data into an expression interpreter when possible.
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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
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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
17 results · Clear filters · Feed
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Medium 5.4CVE-2026-95664 Public exploit
Apache Camel: Camel-AWS2-S3 Producer Evaluates Untrusted S3 Object Keys From the CamelAwsS3Key Header as Simple Expressions
Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection') vulnerability in Apache Camel AWS2-s3 component. This issue affects Apache Camel: from 4.8.0 before 4.18.5, from 4.19.0 before 4.22.2. For t…
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Medium 6.4
Data Binding Vulnerability in Spring Web Flow with Unified EL Parser
Applications that configure the WebFlowELExpressionParser are vulnerable to the use of malicious Unified EL expressions. Affected versions: Spring Web Flow 4.0.0; 3.0.0 through 3.0.1; 2.5.0 through 2.5.1.
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Medium 6.4
Spring Data KeyValue - SpEL Injection vulnerability in SpelPropertyComparator
A SpEL Injection vulnerability exists in the Spring Data KeyValue if unsanitized user input is passed as Sort into a repository query method that delegates evaluation to the SpelPropertyComparator. Affected versions: Spring Data KeyValue / Spring Data Redis 4…
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Medium —
Caddy CVE-2026-30852 Fix Bypass
# ## TL;DR CVE-2026-30852 fixed double expansion in `vars_regexp` when the variable key is a placeholder (e.g. `{http.vars.x}`). The fix does NOT protect literal key names (e.g. `tenant_id`). An attacker injects `{env.AWS_SECRET_ACCESS_KEY}` or `{file./etc/pa…
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Medium 6.5
Apache OFBiz: FreeMarker SSTI via Duplicate Parameter Sanitization Bypass
Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection') vulnerability in Apache OFBiz. This issue affects Apache OFBiz: before 24.09.06. Users are recommended to upgrade to version 24.09.06, which…
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Medium 6.3
Traefik has Knative Ingress Rule Injection that Allows Host Restriction Bypass
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 3.6.11 and 3.7.0-ea.2, Traefik's Knative provider builds router rules by interpolating user-controlled values into backtick-delimited rule expressions without escaping. In live cluster vali…
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Medium 6.5
Hutool allows remote code execution (RCE) via the QLExpressEngine class
An issue was discovered in chinabugotech hutool before 5.8.4 allowing attackers to execute arbitrary expressions that lead to arbitrary method invocation and potentially remote code execution (RCE) via the QLExpressEngine class.
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Medium 5.9
JaninoEventEvaluator vulnerability
ACE vulnerability in JaninoEventEvaluator by QOS.CH logback-core upto including version 0.1 to 1.3.14 and 1.4.0 to 1.5.12 in Java applications allows attacker to execute arbitrary code by compromising an existing logback configuration file or by injecting an …
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Medium 6.3
Reflected XSS in PaperCut MF
A reflected cross-site scripting (XSS) vulnerability exists in PaperCut NG/MF. This issue can be used to execute specially created JavaScript payloads in the browser. A user must click on a malicious link for this issue to occur.
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Medium 6.3
DataGear Data Schema Page ConversionSqlParamValueMapper.java evaluateVariableExpression expression language injection
A vulnerability was found in DataGear up to 5.0.0. It has been declared as critical. Affected by this vulnerability is the function evaluateVariableExpression of the file ConversionSqlParamValueMapper.java of the component Data Schema Page. The manipulation l…
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Medium 4.9
Improper Neutralization of Special Elements in mintplex-labs/anything-llm
Mintplex-Labs' anything-llm application is vulnerable to improper neutralization of special elements used in an expression language statement, identified in the commit id `57984fa85c31988b2eff429adfc654c46e0c342a`. The vulnerability arises from the applicatio…
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Medium 5.4
Apache Jena: Exposure of arbitrary execution in script engine expressions.
There is insufficient checking of user queries in Apache Jena versions 4.7.0 and earlier, when invoking custom scripts. It allows a remote user to execute arbitrary javascript via a SPARQL query.
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Medium 6.5
Spring Framework vulnerable to denial of service
In spring framework versions prior to 5.2.24 release+ ,5.3.27+ and 6.0.8+ , it is possible for a user to provide a specially crafted SpEL expression that may cause a denial-of-service (DoS) condition.
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Medium 6.5
Spring Framework vulnerable to denial of service via specially crafted SpEL expression
In Spring Framework versions 6.0.0 - 6.0.6, 5.3.0 - 5.3.25, 5.2.0.RELEASE - 5.2.22.RELEASE, and older unsupported versions, it is possible for a user to provide a specially crafted SpEL expression that may cause a denial-of-service (DoS) condition.
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Medium 5.7
TYPO3 contains Sensitive Information Disclosure via YAML Placeholder Expressions in Site Configuration
TYPO3 is an open source PHP based web content management system. Versions prior to 9.5.38, 10.4.33, 11.5.20, and 12.1.1 are subject to Sensitive Information Disclosure. Due to the lack of handling user-submitted YAML placeholder expressions in the site config…
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Medium 5.3
Improper Input Validation in Jakarta Expression Language
In the Jakarta Expression Language implementation 3.0.3 and earlier, a bug in the ELParserTokenManager enables invalid EL expressions to be evaluated as if they were valid.
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Medium —
Apache Tiles Vulnerable to XSS via EL Expression Injection
Apache Tiles 2.1 before 2.1.2, as used in Apache Struts and other products, evaluates Expression Language (EL) expressions twice in certain circumstances, which allows remote attackers to conduct cross-site scripting (XSS) attacks or obtain sensitive informat…