CVE-2026-2587
GlassFish's gadget handler is vulnerable to RCE
Description
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.
How to fix CVE-2026-2587
To remediate CVE-2026-2587, upgrade the affected package to a fixed version below.
- —upgrade to 4.2.0 or later
- —upgrade to 8.0.2 or later
Is CVE-2026-2587 being exploited?
No exploitation signal available. Neither CISA KEV nor a current EPSS score has been published for CVE-2026-2587.
Affected packages (2)
- from 0, < 4.2.0
- from 0, < 8.0.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H |