CVE-2026-103863
Published:November 05, 2026
Updated:November 09, 2026
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 Packages
https://github.com/apache/sling-org-apache-sling-engine.git (GITHUB):
Affected version(s) >=org.apache.sling.engine-2.15.0 <org.apache.sling.engine-3.0.4 || >=org.apache.sling.engine-3.0.0 <org.apache.sling.engine-3.0.4Fix Suggestion:
Update to version org.apache.sling.engine-3.0.4org.apache.sling:org.apache.sling.engine (JAVA):
Affected version(s) >=3.0.0 <3.0.4 || >=2.15.0 <3.0.4Fix Suggestion:
Update to version 3.0.4Related Resources (2)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
LOW
Subsequent System Integrity
LOW
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.4
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE