CVE-2021-24751: The GenerateBlocks WordPress plugin before 1.4.0 does not validate the generateblocks/container block's tagNam

Q: How do I fix CVE-2021-24751?

generateblocks: upgrade to 1.4.0. Exact commands for each OS are on this page.

Q: Is CVE-2021-24751 being exploited?

CVE-2021-24751 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-2021-24751 affect?

CVE-2021-24751 affects generateblocks. Severity is medium (CVSS 5.4). The GenerateBlocks WordPress plugin before 1.4.0 does not validate the generateblocks/container block's tagName attribute, which could allow users with a role as low as contributor to perform Cross-Site Scripting attacks.

Q: How urgent is CVE-2021-24751?

Priority 36/100. Public exploit reference

Routine

MEDIUM 5.4UPGRADE

CVE-2021-24751 is a medium-severity flaw (CVSS 5.4) affecting generateblocks. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The GenerateBlocks WordPress plugin before 1.4.0 does not validate the generateblocks/container block's tagName attribute, which could allow users with a role as low as contributor to perform Cross-Site Scripting attacks.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-11-29
Last modified	2026-06-17

Publisher (CNA): WPScan · Vendor: generateblocks

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

Am I affected?

Timeline

2021-11-29 09:15 UTCPublished CVE record published
2026-06-17 03:40 UTCUpdated Record last modified

generateblocks generateblocks UPGRADE

Affected: < 1.4.0

Fixed in: 1.4.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.4.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade generateblocks

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-2021-24751?

generateblocks: upgrade to 1.4.0. Exact commands for each OS are on this page.

Is CVE-2021-24751 being exploited?

CVE-2021-24751 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-2021-24751 affect?

CVE-2021-24751 affects generateblocks. Severity is medium (CVSS 5.4). The GenerateBlocks WordPress plugin before 1.4.0 does not validate the generateblocks/container block's tagName attribute, which could allow users with a role as low as contributor to perform Cross-Site Scripting attacks.

How urgent is CVE-2021-24751?

Priority 36/100. Public exploit reference

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2024-1452 MEDIUM 4.3 UPGRADE The GenerateBlocks plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to,

References

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