CVE-2024-0688: Pubsubhubbub Websub

Medium severity, CVSS 4.8. EPSS: 0.3% chance of exploitation in the next 30 days.

The "WebSub (FKA. PubSubHubbub)" plugin for WordPress is vulnerable to Stored Cross-Site Scripting via plugin settings in all versions up to, and including, 3.1.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Affected products

• Pubsubhubbub Websub: before 3.2.0 (fixed in 3.2.0)

Published 2024-01-25. Last modified 2026-06-17.