CVE-2024-13883: WPUpper Share Buttons <= 3.51 - Cross-Site Request Forgery to Custom CSS Update

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-02-21 · updated 2026-06-17
Weakness: CWE-352

Description

The WPUpper Share Buttons plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 3.51. This is due to missing or incorrect nonce validation on the 'save_custom_css_request' function. This makes it possible for unauthenticated attackers to inject custom CSS to modify a site via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

Affected products

victorfreitas WPUpper Share Buttons: through 3.51

References

https://plugins.trac.wordpress.org/browser/wpupper-share-buttons/trunk/Controller/ajax.controller.php#L94
https://plugins.trac.wordpress.org/changeset/3262537/
https://www.wordfence.com/threat-intel/vulnerabilities/id/5ca55c87-6548-43b8-a23f-d31a51df9533?source=cve

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