---
id: CVE-2026-103863
title: >-
  Apache Sling Engine: Include-protection mitigations bypassable via uncovered
  response-wrapper paths
summary: "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\_/\_checkcontenttyp…"
severity: none
cwe:
  - CWE-79
  - CWE-693
vendor: Apache Software Foundation
product: Apache Sling Engine
affected:
  - apache_sling_engine < 3.0.4
published: '2026-11-05'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T22:05:41.569Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-103863'
references:
  - url: 'https://lists.apache.org/thread.html/rll7kjtbpj2lvh4nzmrw5sdmqww64ldg'
tags:
  - cve.org
ingestedAt: '2026-11-05T21:36:00.837Z'
---

## Overview

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

- `apache_sling_engine < 3.0.4`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.