LiteSpeed Cache <= 7.9.1 - Authenticated (Subscriber+) Stored Cross-Site Scripting via VPI Image Attribute Re-Serialization

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.

References

• https://www.wordfence.com/threat-intel/vulnerabilities/id/8bf9b130-bb1e-43fc-b5c9-337646b8976e?source=cve
• https://plugins.trac.wordpress.org/browser/litespeed-cache/tags/7.9.1/src/media.cls.php#L968
• https://plugins.trac.wordpress.org/browser/litespeed-cache/tags/7.9.1/src/media.cls.php#L936
• https://plugins.trac.wordpress.org/browser/litespeed-cache/tags/7.9.1/src/utility.cls.php#L299
• https://github.com/litespeedtech/lscache_wp/commit/0fc5f9ad69a138b8ee1fe2d07a5e9ac2574e1eb0
• https://plugins.trac.wordpress.org/browser/litespeed-cache/tags/7.9.2/src/media.cls.php

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