What is CVE-2026-2587?

CVE-2026-2587 is a critical-severity vulnerability in Eclipse Glassfish, classified under Improper Neutralization of Special Elements used in an Expression Language Statement (Expression Language Injection). CVSS score: 9.6/10. Published 2026-05-19.

How severe is CVE-2026-2587?

Critical severity. CVSS v3 base score is 9.6 out of 10.

Is CVE-2026-2587 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

RCE in Eclipse Glassfish

CVE-2026-2587

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.

Vulnerability class: Log4Shell (CVE-2021-44228)

Published 2026-05-19 · last modified 2026-07-24.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (50.9th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 50.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.007 · change: +0.000

Affected products

Eclipse Glassfish
Eclipse Foundation Glassfish — versions 7.1.0, 8.0.2, 8.0.0

Weakness classification (CWE)

CWE-917 — Improper Neutralization of Special Elements used in an Expression Language Statement (Expression Language Injection)

Public proof-of-concept exploits

Bhanunamikaze/CVE-2026-2587-Exploit-POC

References

gitlab.eclipse.org/security/cve-assignment/-/issues/86 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2026-2587?: CVE-2026-2587 is a critical-severity vulnerability in Eclipse Glassfish, classified under Improper Neutralization of Special Elements used in an Expression Language Statement (Expression Language Injection). CVSS score: 9.6/10. Published 2026-05-19.
How severe is CVE-2026-2587?: Critical severity. CVSS v3 base score is 9.6 out of 10.
Is CVE-2026-2587 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.