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PatchSiren cyber security CVE debrief

CVE-2026-53739 Yoast CVE debrief

CVE-2026-53739 is a medium-severity cross-site request forgery vulnerability in Yoast Duplicate Post through version 4.6. The vulnerability exists in the `duplicate_post_dismiss_notice` handler, which fails to verify a nonce or capability. This allows attackers to trick any authenticated user into sending a request that sets the `duplicate_post_show_notice` site option, effectively suppressing admin notices network-wide.

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 the Yoast Duplicate Post plugin, particularly those using version 4.6 or earlier, should be aware of this vulnerability and take necessary actions to mitigate it.

Technical summary

The vulnerability has a CVSS score of 5.1 and is classified as medium severity. It is characterized by the following CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X.

Defensive priority

medium

Recommended defensive actions

  • Update to a patched version of Yoast Duplicate Post (if available).
  • Implement additional security measures to prevent cross-site request forgery attacks.

Evidence notes

The CVE record and NVD detail can be found at resourceLinkAnnotations: [cve-org, nvd]. Additional information is available at: [ref-4, ref-5].

Sources and references

Verified primary and authoritative sources

  • CVE-2026-53739 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-53739

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-53739 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-53739

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.