Medium severity6.1NVD Advisory· Published Sep 23, 2026· Updated Sep 30, 2026
CVE-2026-91999
CVE-2026-91999
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2- cpe:2.3:a:apache:sling_xss_protection_api:*:*:*:*:*:*:*:*Range: <2.4.12
Patches
Vulnerability mechanics
References
2- www.openwall.com/lists/oss-security/2026/09/23/14nvdMailing ListThird Party Advisory
- lists.apache.org/thread/xpcsdkr80ow9p13f7hp3ykrhzky9d4t4nvdMailing ListVendor Advisory
News mentions
1- Apache: 25 Vulnerabilities Disclosed, Critical Flaws Hit Tomcat on Sep 23-24, 2026Vypr Intelligence · Sep 24, 2026