Arbitrary file upload in External image replace plugin for WordPress

1) Arbitrary file upload

EUVDB-ID: #VU108685

Risk: Medium

CVSSv4.0: 6.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-4279

CWE-ID: CWE-434 - Unrestricted Upload of File with Dangerous Type

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to insufficient validation of file during file upload in the "external_image_replace_get_posts::replace_post" function. A remote user can upload a malicious file and execute it on the server.

Mitigation

Install update from vendor's website.

Vulnerable software versions

External image replace: 1.0.0 - 1.0.8

CPE2.3

• cpe:2.3:a:muromuro:external-image-replace:1.0.0:*:*:*:*:wordpress:*:*
• cpe:2.3:a:muromuro:external-image-replace:1.0.1:*:*:*:*:wordpress:*:*
• cpe:2.3:a:muromuro:external-image-replace:1.0.2:*:*:*:*:wordpress:*:*

External links

https://plugins.trac.wordpress.org/browser/external-image-replace/tags/1.0.8/class.php#L87
https://www.wordfence.com/threat-intel/vulnerabilities/id/ee1624fd-d98b-4953-99dc-a952dda48aa1?source=cve

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.