HOMEVULNERABILITIESCVE-2018-1000773
HIGH

CVE-2018-1000773

CWE-20Published: September 6, 2018· Updated: Jun 17, 2026

8.8
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2018-1000773 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

WordPress1 product(s)
wordpress
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://www.securityfocus.com/bid/105306
ADVISORYhttps://www.theregister.co.uk/2018/08/20/php_unserialisation_wordpress_vuln/
ADVISORYhttps://youtu.be/GePBmsNJw6Y?t=1763
ADVISORYhttp://www.securityfocus.com/bid/105306
ADVISORYhttps://www.theregister.co.uk/2018/08/20/php_unserialisation_wordpress_vuln/
ADVISORYhttps://youtu.be/GePBmsNJw6Y?t=1763

All References (6)

→
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

Quick Facts

CVE IDCVE-2018-1000773
CVSS Score8.8 / 10
SeverityHIGH
WeaknessCWE-20
CISA KEVNo
Affected1 vendor(s)
PublishedSep 6, 2018

Related CVEs (CWE-20)

CVE-2010-4803
10.0
CVE-2011-1853
10.0
CVE-2011-0661
10.0
CVE-2010-4802
10.0
CVE-2011-1849
10.0
CVE-2011-1268
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-1000773 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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