CVE-2026-2587: Eclipse GlassFish EL injection in gadget handler

CVE-2026-2587 · Severity: critical · CVSS 9.6 · Published 2026-05-19

Eclipse GlassFish, an application server used for hosting Java-based web applications, contains a critical vulnerability in its gadget handler component. An attacker can exploit this flaw to execute arbitrary commands on the server by submitting specially crafted XML files. This could lead to a full system compromise, allowing unauthorized access to sensitive data, service disruption, and a foothold for further attacks within the corporate network.

Technologies: Eclipse Foundation GlassFish. Vendors: Eclipse Foundation, Maven.

Quick answers

Is CVE-2026-2587 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-2587 being exploited in the wild.
How severe is CVE-2026-2587?
Critical severity, with a CVSS score of 9.6, published 19 May 2026.
Which products and versions are affected?
Eclipse Foundation Admingui < 8.0.2; Eclipse Foundation GlassFish < 8.0.2, 8.0.0, all versions before 7.1.0; Eclipse Foundation Jsftemplating < 4.2.0; org.glassfish.jsftemplating:jsftemplating (Maven) < 4.2.0, ECOSYSTEM:introduced=0,fixed=4.2.0; and 1 more.
Is there a fix for CVE-2026-2587?
Yes. org.glassfish.jsftemplating:jsftemplating (Maven): upgrade to 4.2.0 or later; org.glassfish.main.admingui:admingui (Maven): upgrade to 8.0.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-2587 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-2587?
Check whether you run Eclipse Foundation Admingui, Eclipse Foundation GlassFish, Eclipse Foundation Jsftemplating or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • org.glassfish.jsftemplating:jsftemplating (Maven): upgrade to 4.2.0 or later
    # set org.glassfish.jsftemplating:jsftemplating to 4.2.0 in your pom.xml or build.gradle
  • org.glassfish.main.admingui:admingui (Maven): upgrade to 8.0.2 or later
    # set org.glassfish.main.admingui:admingui to 8.0.2 in your pom.xml or build.gradle

Technical details

A critical Expression Language (EL) injection vulnerability (CWE-917) exists in the GlassFish gadget handler's server-side template rendering mechanism. The vulnerability stems from the improper neutralization of user-supplied values within .xml files before they are processed by the EL evaluator. A remote attacker can inject malicious EL expressions (e.g., #{7*7}) to achieve arbitrary code execution on the underlying host. While the CVSS vector indicates some level of user interaction (UI:R), the flaw allows for full compromise of confidentiality, integrity, and availability. The issue is addressed in GlassFish version 8.0.2 and jsftemplating version 4.2.0.

Affected products

  • Eclipse Foundation GlassFish < 8.0.2
  • Eclipse Foundation jsftemplating < 4.2.0
  • Eclipse Foundation admingui < 8.0.2

Identifiers

  • CVE-2026-2587
  • GHSA-29wv-cv7p-xjc2

Timeline

  • 2025-12-15: other: Vulnerability reported by Camilo G.
  • 2026-05-05: patched: GlassFish 8.0.2 released with fixes
  • 2026-05-19: disclosed: NVD and GitHub Advisory published

References

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