In WordPress before 4.9.9 and 5.x before 5.0.1, contributors could conduct PHP object…
Priority MEDIUM 64CWE-502Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-502.
Summary
In WordPress before 4.9.9 and 5.x before 5.0.1, contributors could conduct PHP object injection attacks via crafted metadata in a wp.getMediaItem XMLRPC call. This is caused by mishandling of serialized data at phar:// URLs in the wp_get_attachment_thumb_file function in wp-includes/post.php.
Why it matters now
EPSS 0.26819 98th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2018-20148
- 2026-10-03 Alias added: GHSA-jgj7-cghf-2wq9
References
Advisory 8
- https://wordpress.org/support/wordpress-version/version-5-0-1/
- https://codex.wordpress.org/Version_4.9.9
- https://wpvulndb.com/vulnerabilities/9171
- https://www.zdnet.com/article/wordpress-vulnerability-affects-a-third-of-most-popular-websites-online/
- DSA-4401
- https://wordpress.org/news/2018/12/wordpress-5-0-1-security-release/
- [debian-lts-announce] 20190211 [SECURITY] [DLA 1673-1] wordpress security update
- https://www.zdnet.com/article/wordpress-plugs-bug-that-led-to-google-indexing-some-user-passwords/
Sources
- CVE-2018-20148 · CVE Program
- CVE-2018-20148 · NVD
- FIRST EPSS
- GHSA-jgj7-cghf-2wq9 · GitHub Advisory Database · CC BY 4.0
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