Quick answers
- Is CVE-2026-53739 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-53739 being exploited in the wild.
- How severe is CVE-2026-53739?
- Medium severity, with a CVSS score of 4.3, published 10 June 2026.
- Which products and versions are affected?
- Yoast Duplicate Post through 4.6.
- Is there a fix for CVE-2026-53739?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-53739 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-53739?
- Check whether you run Yoast Duplicate Post at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A Cross-Site Request Forgery (CSRF) vulnerability exists in the Yoast Duplicate Post plugin for WordPress through version 4.6. The 'duplicate_post_dismiss_notice' handler fails to implement nonce verification or check for user capabilities. By inducing an authenticated user (typically an administrator) to visit a malicious URL, an attacker can trigger a request that modifies the 'duplicate_post_show_notice' site option. This results in the suppression of administrative notices across the network. The attack requires network connectivity and user interaction but no prior authentication by the attacker.
Affected products
- Yoast Yoast Duplicate Post through 4.6
Timeline
- 2026-06-10: advisory: NVD and VulnCheck published the advisory