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Vulnerability record · CVE-2018-1000773 · published 6 September 2018

CVE-2018-1000773: Wordpress improper input validation vulnerability

Wordpress · Wordpress

WordPress version 4.9.8 and earlier contains a CWE-20 Input Validation vulnerability in thumbnail processing that can result in remote code execution due to an incomplete fix for CVE-2017-1000600. This attack appears to be exploitable via thumbnail upload by an authenticated user and may require additional plugins in order to be exploited however this has not been confirmed at this time.

8.8 CVSS 3.0 High EPSS 8.3% · top 5.2% CWE-20 · Improper input validation
8.8CVSS 3.0 base score, v2 6.5
8.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

WordPress version 4.9.8 and earlier contains a CWE-20 Input Validation vulnerability in thumbnail processing that can result in remote code execution due to an incomplete fix for CVE-2017-1000600. This attack appears to be exploitable via thumbnail upload by an authenticated user and may require additional plugins in order to be exploited however this has not been confirmed at this time.

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/105306 Third Party AdvisoryVDB Entry
https://www.theregister.co.uk/2018/08/20/php_unserialisation_wordpress_vuln/ Third Party Advisory
https://youtu.be/GePBmsNJw6Y?t=1763 Third Party Advisory
http://www.securityfocus.com/bid/105306 Third Party AdvisoryVDB Entry
https://www.theregister.co.uk/2018/08/20/php_unserialisation_wordpress_vuln/ Third Party Advisory
https://youtu.be/GePBmsNJw6Y?t=1763 Third Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2018-1000773), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.