---
id: CVE-2026-63169
title: >-
  Omnispace Agora Project before 26.10.0 contains a stored cross-site scripting
  vulnerability that allows authenticated users to post messages containing
  attacker-controlled iframes through the messenger's HTMLPurifier SafeIframe
  branch
summary: >-
  Omnispace Agora Project before 26.10.0 contains a stored cross-site scripting
  vulnerability that allows authenticated users to post messages containing
  attacker-controlled iframes through the messenger's HTMLPurifier SafeIframe
  branch. A…
severity: medium
cvss: 6.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T21:17:40.893'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63169'
references:
  - url: 'https://github.com/xech/agora-project/releases/tag/26.10'
    label: disclosure@vulncheck.com
  - url: 'https://www.agora-project.net/'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/omnispace-agora-project-stored-xss-via-messenger-iframe
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-13T21:58:14.183Z'
---

## Overview

Omnispace Agora Project before 26.10.0 contains a stored cross-site scripting vulnerability that allows authenticated users to post messages containing attacker-controlled iframes through the messenger's HTMLPurifier SafeIframe branch. Attackers can craft a message with a malicious iframe that is stored and automatically rendered to other channel members, enabling zero-click drive-by downloads and framed JavaScript execution in recipients' browsers.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.