CVE-2026-91999
Medium
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.
SeverityMedium
CVSS6.1
Exploit probability—
Product
Apache Sling Xss Protection Api
PublishedSep 23, 2026
First seenSep 23, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- apache sling_xss_protection_api2.4.12 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| apache sling_xss_protection_api | v < 2.4.12 | 2.4.12 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.