What’s Vulnerable › Vulnerabilities

CVE-2026-63171: Omnispace Agora Project < 26.10.0 Stored XSS via Category Description

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-13 · updated 2026-10-27
• Weakness: CWE-79

Description

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.

Affected products

• Omnispace Agora Project: before 26.10.0 — fixed in 26.10.0

How to fix

Upgrade to a fixed version: Omnispace Agora Project 26.10.0. Check the vendor advisory for mitigations.

References

• https://github.com/xech/agora-project/releases/tag/26.10
• https://www.agora-project.net/
• https://www.vulncheck.com/advisories/omnispace-agora-project-stored-xss-via-category-description

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