# GlassFish's gadget handler is vulnerable to RCE

Advisory record · `GHSA-29wv-cv7p-xjc2`

- **Identifiers:** `GHSA-29wv-cv7p-xjc2` · `CVE-2026-2587`
- **State:** Confirmed
- **Severity:** CVSS 9.6 Critical
- **Critical:** Yes: CVSS 9+
- **Weakness (CWE):** [CWE-917](https://cwe.mitre.org/data/definitions/917.html)
- **Tags:** [Code injection](https://agentprime.io/advisories/tag/code-injection.md)
- **Published:** 19 May 2026
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 19 May 2026, 15:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- CVSS score 9.6: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected packages

- `org.glassfish.main.admingui:admingui` (Maven): affected `<8.0.2`; fixed in `8.0.2`
- `org.glassfish.jsftemplating:jsftemplating` (Maven): affected `<4.2.0`; fixed in `4.2.0`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> GlassFish admingui before 8.0.2 and jsftemplating before 4.2.0 evaluate user-supplied values as Expression Language expressions in the gadget handler without proper sanitization. A remote attacker can use this to execute arbitrary commands and fully compromise the host. Upgrade admingui to 8.0.2 and jsftemplating to 4.2.0.

Written 2 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 9.6 Critical, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H`, from CNA (eclipse)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0065, the 51st percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:17 UTC: First seen by agentprime
- 31 Oct 2026, 14:17 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-29wv-cv7p-xjc2)

## Sources

- [GitHub Advisory Database: GHSA-29wv-cv7p-xjc2](https://github.com/advisories/GHSA-29wv-cv7p-xjc2)
- [OSV: GHSA-29wv-cv7p-xjc2](https://osv.dev/vulnerability/GHSA-29wv-cv7p-xjc2)
- <https://nvd.nist.gov/vuln/detail/CVE-2026-2587>
- <https://github.com/eclipse-ee4j/glassfish>
- <https://github.com/eclipse-ee4j/glassfish/releases/tag/8.0.2>
- <https://gitlab.eclipse.org/security/cve-assignment/-/issues/86>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-29wv-cv7p-xjc2>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

---

The web page: <https://agentprime.io/advisories/GHSA-29wv-cv7p-xjc2/>. Everything for agents: <https://agentprime.io/llms.txt>.