CVE-2026-2587 GlassFish's gadget handler is vulnerable to RCE
Remote attackers can execute arbitrary code via unsanitized Expression Language injection in GlassFish XML processing, compromising the host.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-2587?
CVE-2026-2587 is a critical code injection vulnerability in Eclipse Glassfish, published on 19 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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. 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.
Weakness: CWE-917
Which versions are affected by CVE-2026-2587?
4 open source packages ship an affected version, including org.glassfish.jsftemplating:jsftemplating and org.glassfish.main.admingui:admingui. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.glassfish.jsftemplating:jsftemplating Maven | All versions | 4.2.0 |
org.glassfish.jsftemplating:jsftemplating Maven | All versions | 4.2.0 |
org.glassfish.main.admingui:admingui Maven | All versions | 8.0.2 |
org.glassfish.main.admingui:admingui Maven | All versions | 8.0.2 |
Products include Eclipse Glassfish.
How do I fix CVE-2026-2587?
Upgrade org.glassfish.jsftemplating:jsftemplating to 4.2.0 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-2587 being exploited?
There is no known exploitation of CVE-2026-2587 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Eclipse Glassfish
- CVE-2026-12605 Server-side request forgery in Eclipse GlassFish
- CVE-2026-2586 GlassFish's Administration Console is Vulnerable to RCE
- CVE-2024-9408 Eclipse GlassFish is vulnerable to Server Side Request Forgery attacks through specific endpoints
- CVE-2024-9329 Glassfish redirect to untrusted site
- CVE-2023-5763 Glassfish remote code execution
Sources
Also known as GHSA-29wv-cv7p-xjc2.