What’s Vulnerable › Vulnerabilities

CVE-2024-0688: WebSub (FKA. PubSubHubbub) <= 3.1.4 - Authenticated (Admin+) Stored Cross-Site Scripting

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-01-25 · updated 2026-06-17
• Weakness: CWE-79

Description

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

• joshfraz WebSub (FKA. PubSubHubbub): before 3.2.0 — fixed in 3.2.0

How to fix

Upgrade to a fixed version: joshfraz WebSub (FKA. PubSubHubbub) 3.2.0. Check the vendor advisory for mitigations.

References

• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3024228%40pubsubhubbub&new=3024228%40pubsubhubbub&sfp_email=&sfph_mail=
• https://www.wordfence.com/threat-intel/vulnerabilities/id/f07b166b-3436-4797-a2df-096ff7c27a09?source=cve
• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3024228%40pubsubhubbub&new=3024228%40pubsubhubbub&sfp_email=&sfph_mail=
• https://www.wordfence.com/threat-intel/vulnerabilities/id/f07b166b-3436-4797-a2df-096ff7c27a09?source=cve

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