The LiteSpeed Cache WordPress plugin before 4.4.4 does not properly verify that requests are coming from QUIC.cloud servers, allowing attackers to make requests to certain endpoints by using a specific X-Forwarded-For header value. In addition, one of the endpoint could be used to set CSS code if a setting is enabled, which will then be output in some pages without being sanitised and escaped. Combining those two issues, an unauthenticated attacker could put Cross-Site Scripting payloads in pages visited by users.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Litespeed Cache Plugin | — | Update litespeed-cache plugin to version 4.4.4, or a newer patched version | May 15, 2025 | Nov 30, 2021 |
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