CVE-2026-80180
Received Received - Intake

Stored XSS via Markdown HTML Processing in Apache Allura

Publication date: 2026-09-04

Last updated on: 2026-09-04

Assigner: Apache Software Foundation

Description
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.

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Meta Information

Published
2026-09-04
Last Modified
2026-09-04
Generated
2026-09-04
AI Q&A
2026-09-04
EPSS Evaluated
N/A
NVD
CVE-2026-80180
EUVD
EUVD-2026-70921

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
apache allura 1.21.0
apache allura From 1.20.0 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This is a stored cross-site scripting (XSS) vulnerability in Apache Allura. It occurs when user-supplied input in markdown is processed as HTML, allowing malicious scripts to be stored and executed in other users' browsers.

Detection Guidance

Detection involves checking for stored XSS in markdown HTML processing. Review user-generated content for suspicious scripts, especially in Apache Allura instances running versions through 1.20.0. Inspect logs for unusual input patterns or script tags in markdown fields.

Impact Analysis

An attacker could exploit this to steal session cookies, perform actions on behalf of users, or deface pages. Users viewing affected content could have their accounts compromised or sensitive data exposed.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR's integrity and confidentiality principles or HIPAA's safeguards for protected health information. Organizations may face compliance penalties if exploited.

Mitigation Strategies

Upgrade Apache Allura to version 1.21.0 or later to fix the stored XSS vulnerability via markdown HTML processing.

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