Eclipse Glassfish up to 7.0.x/8.0.0 Gadget expression language injection

Summaryinfo

A vulnerability, which was classified as critical, has been found in Eclipse Glassfish up to 7.0.x/8.0.0. This issue affects some unknown processing of the component Gadget Handler. This manipulation causes expression language injection. This vulnerability is tracked as CVE-2026-2587. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Eclipse Glassfish up to 7.0.x/8.0.0. It has been declared as critical. Affected by this vulnerability is an unknown functionality of the component Gadget Handler. The manipulation with an unknown input leads to a expression language injection vulnerability. The CWE definition for the vulnerability is CWE-917. 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. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A critical Remote Code Execution (RCE) vulnerability was identified in the server-side template rendering mechanism used by the Glassfish gadget handler. The application processes .xml files and evaluates user-supplied values within a context where Expression Language (EL) “expressions” are processed without proper sanitization or escaping. By injecting expressions such as #{7*7}, the server returns 49, confirming server-side EL evaluation. This issue allows a remote attacker to fully compromise the underlying host, enabling capabilities as reading/modifying data, executing arbitrary commands, persistence, and lateral movement. This issue affects Eclipse GlassFish: from 8.0.0 to 8.0.1, fixed in 8.0.2; 7.1.0, fixed in 7.1.1; from 7.0.0 to 7.0.25, fixed in 7.0.26. Impact on versions from 5.1.0 to 6.2.5 is unknown.

The weakness was disclosed by Camilo G.. It is possible to read the advisory at gitlab.eclipse.org. This vulnerability is known as CVE-2026-2587 since 02/16/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 7.1.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-30941). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Application Server Software

Vendor

• Eclipse

Name

• Glassfish

Version

• 7.0
• 8.0

License

• open-source

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