CVE-2018-1000773
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (8.34%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- 8.8 HIGHCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 8.34% probability · 95th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- wordpress/wordpress
- Source
- cve@mitre.org
EPSS moved from 6.9% on 21 September 2026 to 8.3% on 27 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
References
- http://www.securityfocus.com/bid/105306Third Party Advisory, VDB Entry
- https://www.theregister.co.uk/2018/08/20/php_unserialisation_wordpress_vuln/Third Party Advisory
- https://youtu.be/GePBmsNJw6Y?t=1763Third Party Advisory
- http://www.securityfocus.com/bid/105306Third Party Advisory, VDB Entry
- https://www.theregister.co.uk/2018/08/20/php_unserialisation_wordpress_vuln/Third Party Advisory
- https://youtu.be/GePBmsNJw6Y?t=1763Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.