CVE-2026-1800
Published: 21 March 2026
Summary
CVE-2026-1800 is a high-severity SQL Injection (CWE-89) vulnerability in Wordpress (inferred from references). Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 29.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 RA-5 (Vulnerability Monitoring and Scanning) and SI-10 (Information Input Validation).
Deeper analysis
CVE-2026-1800 is a time-based SQL injection vulnerability in the Fonts Manager | Custom Fonts plugin for WordPress, affecting all versions up to and including 1.2. The flaw occurs via the 'fmcfIdSelectedFnt' parameter due to insufficient escaping of user-supplied input and lack of sufficient preparation in the existing SQL query, allowing attackers to append additional SQL queries. It has a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N) and is associated with CWE-89 (SQL Injection). The vulnerability was published on 2026-03-21.
Unauthenticated attackers can exploit this vulnerability remotely over the network with low complexity and no user interaction required. By injecting payloads into the vulnerable parameter, they can leverage time-based blind SQL injection techniques to extract sensitive information from the WordPress database, such as user credentials or other site data.
References include code locations in the plugin's source at lines such as fmcf_stylish_font.php#L99 and fmcf-stylish-fonts-functions.php#L552, #L573, and #L626, along with a Wordfence threat intelligence entry detailing the vulnerability.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-14011
Vulnerability details
The Fonts Manager | Custom Fonts plugin for WordPress is vulnerable to time-based SQL Injection via the ‘fmcfIdSelectedFnt’ parameter in all versions up to, and including, 1.2 due to insufficient escaping on the user supplied parameter and lack of sufficient…
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preparation on the existing SQL query. This makes it possible for unauthenticated attackers to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
SQL injection in public-facing WordPress plugin directly enables remote exploitation of web application (T1190) and extraction of data/credentials from the backend database (T1213.006).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Requires validation of user-supplied parameters like 'fmcfIdSelectedFnt' to block malicious SQL injection payloads before they reach the database query.
Mandates identification, reporting, and patching of flaws such as the insufficient escaping in the Fonts Manager plugin to eliminate the SQL injection vulnerability.
Enables vulnerability scanning of web applications and plugins to identify SQL injection issues like CVE-2026-1800 for timely remediation.