CVE-2026-103863CWE-693CWE-79

CVE-2026-103863: vulnerability in Apache Sling Engine

Apache Sling Engine: Include-protection mitigations bypassable via uncovered response-wrapper paths

Published

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3Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackepss 0.2%
Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Apache Sling Engine. Content-Type, charset, and redirect changes from an included component evade the  protectheaders / checkcontenttype  enforcement through setHeader(), repeated calls to setContentType(), the charset APIs, Servlet 6.1 redirect overloads, and stale config - enabling stored XSS despite enabled protections. This issue affects Apache Sling Engine before 3.0.4. Users are recommended to upgrade to version 3.0.4, which fixes the issue.
Affected products
Apache Software Foundation · Apache Sling Engine
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