# Apache Wicket has a Cross-site Scripting issue

Advisory record · `GHSA-5x9h-93gp-chpj`

- **Identifiers:** `GHSA-5x9h-93gp-chpj` · `CVE-2026-42509`
- **State:** Confirmed
- **Severity:** CVSS 6.1 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-79](https://cwe.mitre.org/data/definitions/79.html)
- **Tags:** [Cross-site scripting (XSS)](https://agentprime.io/advisories/tag/xss.md)
- **Published:** 6 May 2026
- **Updated:** 11 May 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 6 May 2026, 12:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `org.apache.wicket:wicket-parent` (Maven): affected `>=8.0.0-M1, <=8.17.0 || >=9.0.0-M1, <=9.22.0 || >=10.0.0-M1, <10.9.0`; fixed in `10.9.0`

## Machine-written summary

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

> Apache Wicket versions 8.0.0 through 8.17.0, 9.0.0 through 9.22.0 and 10.0.0 through 10.8.0 are affected by a cross-site scripting vulnerability. The source does not describe what input triggers it or what conditions an attacker needs. Users should upgrade to Apache Wicket 10.9.0, which fixes the issue.

Written 3 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

- 6.1 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** 0.0036, the 29th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:20 UTC: First seen by agentprime
- 31 Oct 2026, 14:20 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-5x9h-93gp-chpj)

## Sources

- [GitHub Advisory Database: GHSA-5x9h-93gp-chpj](https://github.com/advisories/GHSA-5x9h-93gp-chpj)
- [OSV: GHSA-5x9h-93gp-chpj](https://osv.dev/vulnerability/GHSA-5x9h-93gp-chpj)
- <https://nvd.nist.gov/vuln/detail/CVE-2026-42509>
- <https://github.com/apache/wicket>
- <https://lists.apache.org/thread/52nrq4tt07gxz4r6sj5gyocz5s6bprjp>
- <http://www.openwall.com/lists/oss-security/2026/05/06/2>

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-5x9h-93gp-chpj>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-5x9h-93gp-chpj/>. Everything for agents: <https://agentprime.io/llms.txt>.