# CVE-2026-15889: Aruba HiSpeed Cache stored cross-site scripting in post content

Source: https://junglewise.ai/threats/cve-2026-15889-aruba-hispeed-cache-stored-cross-site-scripting-in-post-content  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-10. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-15889 · Severity: medium · CVSS 6.4 · Published 2026-09-10

The Aruba HiSpeed Cache plugin for WordPress allows authenticated users with Contributor-level access to inject malicious scripts into post content. When published, these scripts execute in the browsers of all site visitors viewing that page, potentially stealing credentials, hijacking sessions, or defacing content. This affects websites running the plugin through version 3.0.14.

Vendors: [Aruba](https://junglewise.ai/threats/vendors/aruba).

## Quick answers

**Is CVE-2026-15889 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-15889 being exploited in the wild.

**How severe is CVE-2026-15889?** Medium severity, with a CVSS score of 6.4, published 10 September 2026.

**Which products and versions are affected?** Aruba HiSpeed Cache up to and including 3.0.14.

**Is there a fix for CVE-2026-15889?** 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-2026-15889 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-15889?** Check whether you run Aruba HiSpeed Cache 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

The vulnerability is a Stored Cross-Site Scripting (XSS) flaw caused by insufficient input sanitization and output escaping of user-supplied post content within the HiSpeed Cache plugin. An authenticated attacker with Contributor-level access or higher can inject arbitrary JavaScript payloads into posts, which are stored in the database and executed in the browsers of all users viewing those pages. The attack requires authentication but no special privileges beyond the standard Contributor role. No patch availability is mentioned in the advisory.

## Affected products

- Aruba HiSpeed Cache up to and including 3.0.14

## Timeline

- 2026-09-10: disclosed

## References

- [https://plugins.trac.wordpress.org/changeset/3674227/](https://plugins.trac.wordpress.org/changeset/3674227/)
- [https://www.wordfence.com/threat-intel/vulnerabilities/id/59650bce-1b7c-4d3f-b4b0-594108510453?source=cve](https://www.wordfence.com/threat-intel/vulnerabilities/id/59650bce-1b7c-4d3f-b4b0-594108510453?source=cve)