PatchSiren cyber security CVE debrief
CVE-2026-53740 Yoast CVE debrief
CVE-2026-53740 is a MEDIUM-severity vulnerability (CVSS Score: 5.1) in the Yoast Duplicate Post plugin for WordPress, affecting versions through 4.6. The vulnerability allows an attacker to inject an unescaped post title and permalink into the Classic Editor scheduled republish notice. By scheduling a republish copy with a crafted title, an attacker can execute a script when an administrator views the resulting notice. The vulnerability was published on [cve-org](https://www.cve.org/CVERecord?id=CVE-2026-53740) and detailed further on [nvd](https://nvd.nist.gov/vuln/detail/CVE-2026-53740).
- Vendor
- Yoast
- Product
- Yoast Duplicate Post
- CVSS
- MEDIUM 5.1
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-06-10
- Original CVE updated
- 2026-06-11
- Advisory published
- 2026-06-10
- Advisory updated
- 2026-06-11
Who should care
Administrators and users of WordPress sites utilizing the Yoast Duplicate Post plugin through version 4.6 should prioritize updating to a patched version to mitigate this vulnerability.
Technical summary
The Yoast Duplicate Post plugin for WordPress inserts an unescaped post title and permalink into the Classic Editor scheduled republish notice. This allows attackers to schedule a republish copy with a crafted title to execute a script when an administrator views the resulting notice, enabling stored Cross-Site Scripting (XSS) attacks.
Defensive priority
High
Recommended defensive actions
- Update the Yoast Duplicate Post plugin to a version beyond 4.6.
- Review and sanitize all post titles and permalinks used in conjunction with the plugin.
- Monitor for suspicious activity related to the Classic Editor scheduled republish notice.
Evidence notes
Evidence suggests that the vulnerability exists within the Yoast Duplicate Post plugin, specifically affecting versions through 4.6. [ref-4](https://wordpress.org/plugins/duplicate-post/) and [ref-5](https://www.vulncheck.com/advisories/yoast-duplicate-post-through-stored-cross-site-scripting-via-scheduled-republish-notice) provide additional context and details about the vulnerability.
Official resources
CVE-2026-53740 was published on 2026-06-10T22:17:02.367Z and modified on 2026-06-11T15:22:26.633Z.