CVE-2026-18978
HighCVSS 7.2Exploitation Probability (EPSS)
Low risk19th percentile - higher than 19% of all known CVEs
Summary
The LiteSpeed Cache plugin for WordPress up to version 7.8.1 is vulnerable to Stored Cross-Site Scripting via Comment Content. Insufficient input sanitization and output escaping allow unauthenticated attackers to inject arbitrary web scripts that execute when a user accesses an injected page. A payload crafted from decimal numeric character references bypasses WordPress's wp_kses sanitization.
Risk Assessment
Attackers can inject malicious scripts, potentially leading to data theft, session hijacking, or malware distribution. The risk includes compromise of user security and site integrity.
Recommendation
Update the LiteSpeed Cache plugin to the latest patched version. Additionally, consider disabling comments or tightening moderation policies.
Other vulnerabilities in LiteSpeed Cache
See all- CVE-2026-76579Medium
The LiteSpeed Cache plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'esi' parameter in all versions up to and including 7.9 due to insufficient input sanitization and output escaping. This allows unauthenticated attackers to inject arbitrary web scripts that execute if they can trick a user into clicking a link. Exploitation requires a validly signed 'esi' value in the GET query string and a separate attacker-controlled 'esi' payload as a POST body field, relying on PHP's default $_REQUEST merge order.
- CVE-2026-84761High
Unauthenticated Server Side Request Forgery (SSRF) in LiteSpeed Cache versions up to 7.9. An attacker can send requests from the server to internal resources without authentication.
- CVE-2026-3129Medium
The LiteSpeed Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via crafted `<img>` tag attributes in all versions up to, and including, 7.7. This is due to a flawed regular expression used to strip `width` and `height` attributes from images when the "Lazy Load Images" and "Add Missing Sizes" features are enabled.
- CVE-2025-12450Medium
The LiteSpeed Cache plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via URLs in all versions up to, and including, 7.5.0.1 due to insufficient input sanitization and output escaping. This allows unauthenticated attackers to inject arbitrary web scripts that execute if they can trick a user into performing an action such as clicking a link.
Original NVD description (English source)
The LiteSpeed Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Content in all versions up to, and including, 7.8.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. A comment payload crafted exclusively from decimal numeric character references (e.g. ", <, >) placed inside an allowed element such as <code> bypasses WordPress's wp_kses sanitization, as kses does not treat a data-settings="..." substring within text content as an HTML attribute, allowing the malicious payload to reach the vulnerable function. For this to be exploitable, the site must allow users with previously approved comments to write new comments, and the require_name_email setting must be disabled.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS