CVE-2026-91999

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.

Score

CVSS 3.1 6.1 Medium

Status

Analyzed - security@apache.org

Published

2026-09-23

Last modified

2026-09-23

Weaknesses

CWE-79

Affected products

• Sling Xss Protection Api (Apache)
• Apache Sling Xss (Apache Software Foundation)

References

• https://lists.apache.org/thread/xpcsdkr80ow9p13f7hp3ykrhzky9d4t4
• http://www.openwall.com/lists/oss-security/2026/09/23/14