Apache Answer 2.0.0 XSS via Unescaped HTML in Email Notifications
CVE-2026-34033 Published on June 9, 2026
Apache Answer: HTML Content Injection in Email
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in Apache Answer.
This issue affects Apache Answer: through 2.0.0.
User-supplied content was included in notification emails without proper escaping, allowing authenticated users to inject arbitrary HTML into emails sent to other users.
Users are recommended to upgrade to version 2.0.1, which fixes the issue.
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-2026-34033 has been classified to as a Basic XSS vulnerability or weakness.
Products Associated with CVE-2026-34033
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Affected Versions
Apache Software Foundation Apache Answer:- Before and including 2.0.0 is affected.