Description
The LiteSpeed Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'bbp_reply_content' parameter in all versions up to, and including, 7.9.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Exploitation requires that an administrator has enabled Viewport Images (VPI) and configured a VPI filename that matches an image the attacker can embed in user-generated content — such as a bbPress topic where Subscriber-level Participants are permitted to post replies containing raw img tags.
References6
- github.com/litespeedtech/lscache_wp/commit/0fc5f9ad69a138b8ee1f…
- plugins.trac.wordpress.org/browser/litespeed-cache/tags/7.9.1/s…
- plugins.trac.wordpress.org/browser/litespeed-cache/tags/7.9.1/s…
- plugins.trac.wordpress.org/browser/litespeed-cache/tags/7.9.1/s…
- plugins.trac.wordpress.org/browser/litespeed-cache/tags/7.9.2/s…
- www.wordfence.com/threat-intel/vulnerabilities/id/8bf9b130-bb1e…
Metrics
- CVSS 3.1
-
6.4
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N - EPSS — exploit probability
- 0% percentile: 27 · as of 3 November 2026
- CWE
- CWE-79
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.