CVE-2026-91999CWE-79cross-site-scripting

CVE-2026-91999

Medium · published September 23, 2026

CVSS v3.1
6.1
EPSS
0%
Percentile
27.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.1 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00350 · 27.3th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-09-23T14:17Z
Affected products (1)
ProductVersionsFixed in
apache/sling_xss_protection_api< 2.4.122.4.12
References (2)
https://lists.apache.org/thread/xpcsdkr80ow9p13f7hp3ykrhzky9d4t4 · [email protected]http://www.openwall.com/lists/oss-security/2026/09/23/14 · af854a3a-2127-422b-91ae-364da2661108
EPSS history
Timeline
  • 24 SEP 03:25Z
    EPSS moved — → 0%
    epss
  • 23 SEP 09:23Z
    Apache Sling XSS: Improper escaping in the XSS Webconsole plugin
    cvelistv5