XSS in Markdown Handling in Apache Allura 1.10.0-1.19.0
CVE-2026-73237 Published on August 12, 2026
Apache Allura: XSS in markdown pipeline
XSS vulnerability in Markdown handling in Apache Allura.
This issue affects Apache Allura: from 1.10.0 before 1.19.1.
Users are recommended to upgrade to version 1.19.1, which fixes the issue.
Vulnerability Analysis
CVE-2026-73237 can be exploited with network access, requires user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is a Basic XSS Vulnerability?
The software receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages. This may allow such characters to be treated as control characters, which are executed client-side in the context of the user's session. Although this can be classified as an injection problem, the more pertinent issue is the improper conversion of such special characters to respective context-appropriate entities before displaying them to the user.
CVE-2026-73237 has been classified to as a Basic XSS vulnerability or weakness.
Products Associated with CVE-2026-73237
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Affected Versions
Apache Software Foundation Apache Allura:- Version 1.10.0 and below 1.19.1 is affected.