---
id: CVE-2026-63171
title: >-
  Omnispace Agora Project before 26.10.0 contains a stored cross-site scripting
  vulnerability that allows authenticated attackers to inject malicious script
  by submitting a crafted forum category description containing a double-quote
  chara…
summary: >-
  Omnispace Agora Project before 26.10.0 contains a stored cross-site scripting
  vulnerability that allows authenticated attackers to inject malicious script
  by submitting a crafted forum category description containing a double-quote
  chara…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T21:17:41.027'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63171'
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-category-description
    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 attackers to inject malicious script by submitting a crafted forum category description containing a double-quote character that breaks out of an HTML input value attribute. Attackers can exploit the HTMLPurifier configuration that preserves double-quotes to escape the attribute context and execute arbitrary script in the browser of users viewing the forum category.

## Remediation

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