phpwarden
FeaturesComparePricingAdvisoriesBlogDocsChangelogLog in
Log inStart free

CVE-2021-24760: The Gutenberg PDF Viewer Block WordPress plugin before 1.0.1 does not sanitise and escape its block, which could allow users with a role as low as Contributor to perform Cross-Site Scripting attacks.

medium Affects pdf-viewer-block-for-gutenberg (WordPress plugin). Feed 2026.10.29.4, updated 2026-10-29; published ; advisory modified .

The Gutenberg PDF Viewer Block WordPress plugin before 1.0.1 does not sanitise and escape its block, which could allow users with a role as low as Contributor to perform Cross-Site Scripting attacks.

Package
pdf-viewer-block-for-gutenberg (WordPress plugin) WordPress
Affected versions
<1.0.1
Fixed in
1.0.1
Severity
medium  CVSS 5.4
Exploitation
not on CISA KEV · EPSS 1% (51.0th percentile)
Published
2021-10-18
Source
nvd

References

CWE-79
NVD recordpdf-viewer-block-for-gutenberg (WordPress plugin) advisories

Am I affected?

Find out in one command. phpwarden checks your WordPress install against this advisory and 20,000+ others, ranked by real-world exploitation (CISA KEV + EPSS). Free, offline, open data.

# PHP projects (recommended)
composer require --dev phpwarden/phpwarden
# then
vendor/bin/phpwarden wordpress /var/www/html

# or, without Composer
pipx install phpwarden   &&   phpwarden wordpress /var/www/html

Or keep it checked automatically with the GitHub Action or a nightly cron; see WordPress docs.

Install docs   How findings are ranked

Related advisories