CVE-2024-12047: The WP Compress – Instant Performance & Speed Optimization plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the ‘custom_server’ parameter in all versions up to, and including,

medium Affects wp-compress-image-optimizer (WordPress plugin). Feed 2026.10.29.1, updated 2026-10-28; published 2025-01-04; advisory modified 2026-06-17.

The WP Compress – Instant Performance & Speed Optimization plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the ‘custom_server’ parameter in all versions up to, and including,

Package: wp-compress-image-optimizer (WordPress plugin) WordPress
Affected versions: <6.30.04
Fixed in: 6.30.04
Severity: medium CVSS 6.1
Exploitation: not on CISA KEV · EPSS 0% (31.1th percentile)
Published: 2025-01-04
Source: nvd

References

CWE-79

NVD record wp-compress-image-optimizer (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

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pipx install phpwarden   &&   phpwarden wordpress /var/www/html

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

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