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Medium, CVSS 5.4

Yoast Duplicate Post has an Authenticated (Contributor+) Missing Authorization to Arbitrary Post Duplication and Overwrite

CVE-2026-1217GHSA-g9w4-m5fx-x3wv

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (yoast/duplicate-post 4.6), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
5.4 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
EPSS
  • CVE-2026-1217: 0.18% estimated exploitation activity in the next 30 days; percentile 7.44 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

The Yoast Duplicate Post plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the clonebulkactionhandler() and republishrequest() functions in all versions up to, and including, 4.5. This makes it possible for authenticated attackers, with Contributor-level access and above, to duplicate any post on the site including private, draft, and trashed posts they shouldn't have access to. Additionally, attackers with Author-level access and above can use the Rewrite & Republish feature to overwrite any published post with their own content.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-g9w4-m5fx-x3wv

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-1217

Advisory: Yoast Duplicate Post has an Authenticated (Contributor+) Missing Authorization to Arbitrary Post Duplication and Overwrite
IDs: CVE-2026-1217, GHSA-g9w4-m5fx-x3wv
Record: https://patchnext.com/advisories/cve-2026-1217 (revision 1, source checked 26 Oct 2026, 14:38 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: yoast/duplicate-post 4.6. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist yoast/duplicate-post: affected <= 4.5; fixed in 4.6

## Suggested inspection (read-only)
- Packagist yoast/duplicate-post: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on yoast/duplicate-post.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-g9w4-m5fx-x3wv (GitHub-reviewed advisory GHSA-g9w4-m5fx-x3wv lists affected ranges: Packagist yoast/duplicate-post >=0 <=4.5)

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