CVE-2026-91852: Apache Sling XSS: CWE-79 multiple raw-string break-outs and ReDOS in XSSImpl
Published Sep 23, 2026
·Updated
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.
Affected Software
1 affected component
Apache Sling XSS<2.4.12
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Apache Sling XSSto a version that resolves this vulnerability.Fixed in 2.4.12
Event History
Sep 23, 2026
CVE Published
via MITRE·09:29 AM
Data Sourced
via MITRE·09:29 AM
DescriptionWeakness
Data Sourced
via NVD·10:17 AM
DescriptionSeverityWeakness
Frequently Asked Questions
1
Which deployments need to be upgraded?
Deployments using Apache Sling XSS versions before 2.4.12 are affected. Upgrade to Apache Sling XSS 2.4.12.
2
What is the documented remediation?
The provided advisory recommends upgrading to version 2.4.12, which fixes the issue.