Quick answers
- Is CVE-2026-91928 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-91928 being exploited in the wild.
- How severe is CVE-2026-91928?
- Medium severity, with a CVSS score of 6.1, published 23 September 2026.
- Which products and versions are affected?
- Apache Sling XSS before 2.4.12.
- Is there a fix for CVE-2026-91928?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-91928 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-91928?
- Check whether you run Apache Sling XSS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
This is an improper input neutralization vulnerability in Apache Sling XSS that allows bypass of XSS protections through unsanitized user input during web page generation. The vulnerability affects versions before 2.4.12 and can be exploited via network access with no authentication required if the affected application processes untrusted input. Exploitation allows an attacker to execute arbitrary JavaScript in the context of affected users' browsers; the issue is resolved in version 2.4.12.
Affected products
- Apache Sling XSS before 2.4.12
Timeline
- 2026-09-23: disclosed