---
id: CVE-2026-80180
title: "Stored XSS via markdown HTML processing\_in Apache Allura.\n\n\n\nThis issue affects Apache Allura: from through 1.20.0.\n\n\n\nUsers are recommended to upgrade to version\_1.21.0, which fixes the issue."
summary: "Stored XSS via markdown HTML processing\_in Apache Allura.\n\n\n\nThis issue affects Apache Allura: from through 1.20.0.\n\n\n\nUsers are recommended to upgrade to version\_1.21.0, which fixes the issue."
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
published: '2026-09-04'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T14:00:01.800'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80180'
references:
  - url: 'https://lists.apache.org/thread/rjo2hjhp76qhl9f3br8jq909mohvzkpq'
    label: security@apache.org
  - url: 'http://www.openwall.com/lists/oss-security/2026/09/03/3'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00263
epssPercentile: 0.1608
ingestedAt: '2026-09-08T15:33:26.959Z'
---

## Overview

Stored XSS via markdown HTML processing in Apache Allura.



This issue affects Apache Allura: from through 1.20.0.



Users are recommended to upgrade to version 1.21.0, which fixes the issue.

## Remediation

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