CVE-2017-1000600

Severity: high (CVSS 8.8 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-09-06 · updated 2026-06-17
Weakness: CWE-20

Description

WordPress version <4.9 contains a CWE-20 Input Validation vulnerability in thumbnail processing that can result in remote code execution. 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. This issue appears to have been partially, but not completely fixed in WordPress 4.9

Affected products

WordPress: before 4.9 — fixed in 4.9

How to fix

Upgrade to a fixed version: WordPress 4.9. Check the vendor advisory for mitigations.

References

http://www.securityfocus.com/bid/105305
https://www.theregister.co.uk/2018/08/20/php_unserialisation_wordpress_vuln/
https://youtu.be/GePBmsNJw6Y?t=1763
http://www.securityfocus.com/bid/105305
https://www.theregister.co.uk/2018/08/20/php_unserialisation_wordpress_vuln/
https://youtu.be/GePBmsNJw6Y?t=1763

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