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CVE-2024-39310: WordPress Basil Theme Authenticated (Contributor+) Persistent Cross-Site Scripting Vulnerability

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-07-01 · updated 2026-06-17
• Weakness: CWE-79

Description

The Basil recipe theme for WordPress is vulnerable to Persistent Cross-Site Scripting (XSS) via the `post_title` parameter in versions up to, and including, 2.0.4 due to insufficient input sanitization and output escaping. This vulnerability allows authenticated attackers with contributor-level access and above to inject arbitrary web scripts in pages that will execute whenever a user accesses a compromised page. Because the of the default WordPress validation, it is not possible to insert the payload directly but if the Cooked plugin is installed, it is possible to create a recipe post type (cp_recipe) and inject the payload in the title field. Version 2.0.5 contains a patch for the issue.

Affected products

• XjSv Basil: through 2.0.4

References

• https://github.com/XjSv/Basil/commit/e2b1dbf1637d1ec2663f9aa1a563b02dc76a8146
• https://github.com/XjSv/Basil/security/advisories/GHSA-cr7v-8v2h-49vx
• https://github.com/XjSv/Basil/commit/e2b1dbf1637d1ec2663f9aa1a563b02dc76a8146
• https://github.com/XjSv/Basil/security/advisories/GHSA-cr7v-8v2h-49vx

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