[ CVE-2026-91999 · Published 23 Sep 2026 ]

Vulnerability in Apache Software Foundation Apache Sling XSS

CVSS 6.1 EPSS <1%No fix listed yet

[ Description ]Official 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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

lists.apache.org/thread/xpcsdkr80ow9p13f7hp3ykrhzky9d4t4Mailing ListVendor Advisory
www.openwall.com/lists/oss-security/2026/09/23/14Mailing ListThird Party Advisory