Known vulnerabilities in WebSub (FKA. PubSubHubbub)

A WebSub plugin for WordPress that enables real-time publishing and subscription capabilities.

1Reported vulnerabilities

4.8Highest CVSS score

4.0.1Latest version

100,000+Active installs

What to do now

Update WebSub (FKA. PubSubHubbub) to 3.2.0 or later. 1 of these have a fixed version available. Updating resolves them.

Plugin last updated: August 21, 2026 / Tested up to WordPress: 7.1.2 / View on wordpress.org

Reported vulnerabilities

Ordered by how urgently they need attention — whether a vulnerability is actually being exploited, and how likely exploitation is, rather than CVSS severity alone.

CVE	Severity	Exploit probability next 30 days	Affected versions	Fixed in	Published
CVE-2024-0688	Medium 4.8	0.3%	Before 3.2.0	`3.2.0`	January 25, 2024

Sources: vulnerability records from NVD, exploitation from CISA KEV, exploit probability from EPSS. Affected versions come from CPE ranges or from the reporting CNA.