GlassFish's gadget handler is vulnerable to RCE
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | org.glassfish.jsftemplating:jsftemplating | < 4.2.0 | 4.2.0 |
| Java / Kotlin (Maven) | org.glassfish.main.admingui:admingui | < 8.0.2 | 8.0.2 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H- Weakness (CWE)
CWE-917- Platform
- Java / Kotlin (Maven)
- Package
org.glassfish.jsftemplating:jsftemplating, org.glassfish.main.admingui:admingui- Disclosed
- 19.05.2026
- Updated
- 11.10.2026 13:20
Sources and licenses
OSV / GitHub Advisory Database - GHSA-29wv-cv7p-xjc2 - CC BY 4.0
Vulnerability history: org.glassfish.jsftemplating:jsftemplating
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 05.2026 05.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 2
Disclosures per year
- 2026: 2
-
GlassFish's gadget handler is vulnerable to RCE this entry
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