CVE-2024-0688: The "WebSub (FKA

Q: How do I fix CVE-2024-0688?

websub: upgrade to 3.2.0. Exact commands for each OS are on this page.

Q: Is CVE-2024-0688 being exploited?

CVE-2024-0688 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2024-0688 affect?

CVE-2024-0688 affects websub. Severity is medium (CVSS 4.4). 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 pos

Q: How urgent is CVE-2024-0688?

Priority 21/100. No elevated risk signals yet.

Routine

MEDIUM 4.4UPGRADE

CVE-2024-0688 is a medium-severity flaw (CVSS 4.4) affecting websub. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.4 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	High
User interaction	None
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-79
Published	2024-01-25
Last modified	2026-06-17

Publisher (CNA): Wordfence · Vendor: pubsubhubbub

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-01-25 02:15 UTCPublished CVE record published
2026-06-17 06:54 UTCUpdated Record last modified

pubsubhubbub websub UPGRADE

Affected: < 3.2.0

Fixed in: 3.2.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy websub || rpm -q websub || websub --version

2. UPGRADE to 3.2.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade websub

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade websub

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-0688?

websub: upgrade to 3.2.0. Exact commands for each OS are on this page.

Is CVE-2024-0688 being exploited?

CVE-2024-0688 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-0688 affect?

CVE-2024-0688 affects websub. Severity is medium (CVSS 4.4). 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 pos

How urgent is CVE-2024-0688?

Priority 21/100. No elevated risk signals yet.

Software pages

WordPress vulnerabilities

References

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