---
id: "CVE-2026-66092"
kind: "vulnerability"
aliases: ["CVE-2026-66092"]
title: "openEQUELLA: pre-login notice lets script run on the login page"
severity: "medium"
cvss: 4.8
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["java", "lms", "openequella", "other", "self-hosted"]
not_affected_if: ["no-edit-system-settings-for-guest-or-everyone", "patched-2026.2-or-later"]
published_at: "2026-10-29T02:16:53+00:00"
first_seen_at: "2026-10-29T02:36:48+00:00"
updated_at: "2026-10-29T02:38:05+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-66092", "first_seen_at": "2026-10-29T02:36:48+00:00"}]
---

# openEQUELLA: pre-login notice lets script run on the login page

openEQUELLA renders the pre-login notice as raw HTML on the legacy logon page without encoding or sanitisation. A user with the EDIT_SYSTEM_SETTINGS permission can store a script in the notice, which runs in the browser of anyone who loads the login page.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the openEQUELLA version in the deployment; affected versions are before `2026.2`.
- Check whether the guest user or the Everyone group holds EDIT_SYSTEM_SETTINGS, since that allows unauthenticated exploitation.
- Review the current pre-login notice content via the admin settings for embedded script tags or event handlers.

## Fix

- Upgrade openEQUELLA to `2026.2` or later.
- Remove EDIT_SYSTEM_SETTINGS from the guest user and the Everyone group.
- Rotate credentials for any administrator accounts if a suspicious notice was found.

## Timeline

- 2026-10-29T02:36:48+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-66092

## From the sources

In openEQUELLA before 2026.2, the pre-login notice is stored as HTML and rendered on the legacy logon page without encoding or sanitisation. A user holding the EDIT_SYSTEM_SETTINGS permission can set a notice containing an arbitrary script (PUT /api/preloginnotice), resulting in stored cross-site scripting on the login page. Unauthenticated exploitation is possible where EDIT_SYSTEM_SETTINGS has been granted to the guest user or Everyone

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_