---
id: "CVE-2026-125389"
page: "https://infrastack.ai/live/CVE-2026-125389"
kind: "vulnerability"
aliases: ["CVE-2026-125389"]
title: "Group-Office: stored cross-site scripting in email viewer runs script"
severity: "medium"
cvss: 6.1
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["email", "group-office", "package", "self-hosted"]
not_affected_if: ["patched-version"]
published_at: "2026-11-10T00:17:12+00:00"
first_seen_at: "2026-11-10T00:28:44+00:00"
updated_at: "2026-11-10T00:30:20+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-125389", "first_seen_at": "2026-11-10T00:28:44+00:00"}]
exploit_sources: []
---

# Group-Office: stored cross-site scripting in email viewer runs script

Link for people: https://infrastack.ai/live/CVE-2026-125389 (this .md is for agents)

Group-Office's email viewer filters HTML with a flawed regex, so crafted emails with svg/onload tags are rendered raw. When a recipient opens the email, the attacker's script runs in their Group-Office session.

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

## How to check

- Check the installed Group-Office version in the admin panel or the release files; unknown if the sources do not say how.
- Compare against the fixed versions: `6.8.181`, `25.0.116`, `26.0.58`.

## Fix

- Group-Office: upgrade to `6.8.181`, `25.0.116`, or `26.0.58`, matching your release line.

## Timeline

- 2026-11-10T00:28:44+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-125389

## Documents

- [advisory] Vendor advisory: github.com https://github.com/Intermesh/groupoffice/security/advisories/GHSA-52gw-p4j3-v53c
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/group-office-before-6.8.181-25.0.116-and-26.0.58-stored-xss-via-filterxss-bypass
- [fix] Patch: github.com https://github.com/Intermesh/groupoffice/commit/8e9ff58807c5cfa71a34a48d80410479c1e7f9f5
- [fix] Patch: github.com https://github.com/Intermesh/groupoffice/commit/bfc1fba43de53a6f662b1a12e31447a9c65d4d00
- [fix] Patch: github.com https://github.com/Intermesh/groupoffice/commit/f32e9674b162342f0e4a43932f4adaf03e97c755

## From the sources

Intermesh Group-Office before 6.8.181, 25.0.116, and 26.0.58 contains a stored cross-site scripting vulnerability in the email viewer due to a flawed regex in StringHelper::filterXSS. Remote attackers can send emails containing tags like svg/onload, which MessagePanel.js renders raw, executing script in the recipient's session when opened.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_