High severity · published Oct 28, 2026
CVE-2026-1928
Rank Math SEO <= 1.0.276 - Authenticated (Contributor+) PHP Object Injection to Remote Code Execution
New
8.8
CVSS
0.5%
EPSS
No
On KEV
Description
The Rank Math SEO – AI SEO Tools to Dominate SEO Rankings plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 1.0.276 via deserialization of untrusted input in the updateMeta REST API endpoint. This makes it possible forauthenticated attackers, with Contributor-level access and above, to inject a PHP Object. The additional presence of a POP chain allows attackers to achieve remote code execution by writing a webshell to the uploads directory.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 45% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RM
Rank Math SEO – AI SEO Tools to Dominate SEO Rankings · rankmath
through 1.0.276 · source: vendor
Affected product
RM
Rank Math SEO – AI SEO Tools to Dominate SEO Rankings
rankmath
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-1928
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-1928
www.wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/cd4395be-7b4c-46b0-be00-7dedc6691f4a?source=cve
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/seo-by-rank-math/tags/1.0.263/includes/rest/class-shared.php#L446
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/seo-by-rank-math/tags/1.0.263/includes/modules/schema/class-db.php#L66
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/seo-by-rank-math/tags/1.0.263/includes/rest/class-sanitize.php#L110
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/changeset/3666725/
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