CVE-2026-91999
Received Received - Intake

Cross-Site Scripting in Apache Sling XSS

Publication date: 2026-09-23

Last updated on: 2026-09-23

Assigner: Apache Software Foundation

Description
Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Apache Sling XSS. This issue affects Apache Sling XSS: before 2.4.12. Users are recommended to upgrade to version 2.4.12, which fixes the issue.

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Meta Information

Published
2026-09-23
Last Modified
2026-09-23
Generated
2026-09-23
AI Q&A
2026-09-23
EPSS Evaluated
N/A
NVD
CVE-2026-91999
EUVD
EUVD-2026-85175

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
apache sling_xss to 2.4.12 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This is a cross-site scripting (XSS) vulnerability in Apache Sling XSS. It occurs when user input is not properly neutralized during web page generation, allowing attackers to inject malicious scripts into web pages viewed by other users.

Impact Analysis

This vulnerability could allow attackers to steal user sessions, deface websites, or perform actions on behalf of users. It primarily affects users interacting with vulnerable Apache Sling XSS instances before version 2.4.12.

Mitigation Strategies

Upgrade Apache Sling XSS to version 2.4.12 or later to fix the cross-site scripting vulnerability.

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