# CVE-2026-53740: Yoast Duplicate Post through 4.6 Stored Cross-Site Scripting via Scheduled Republish Notice

> Attackers can execute arbitrary scripts in an administrator's browser by crafting a post title in the Yoast Duplicate Post plugin.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 10 Jun 2026
- **Updated:** 11 Jun 2026
- **Also known as:** GHSA-c45g-9264-93f4

## What is CVE-2026-53740?

CVE-2026-53740 is a medium-severity cross-site scripting vulnerability in Yoast Duplicate Post, published on 10 Jun 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Yoast Duplicate Post through 4.6 inserts an unescaped post title and permalink into the Classic Editor scheduled republish notice. Attackers can schedule a republish copy with a crafted title to execute script when an administrator views the resulting notice.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-53740?


## How do I fix CVE-2026-53740?

No fix has been published for CVE-2026-53740 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-53740 being exploited?

There is no known exploitation of CVE-2026-53740 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-53740 and fix it if it is affected.

What it is: CVE-2026-53740 is a medium-severity cross-site scripting vulnerability in Yoast Duplicate Post, published on 10 Jun 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-53740 in the wild and no public exploit code.

Affected product: Yoast Duplicate Post. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-53740/ (Markdown: https://insights.sbomify.com/CVE-2026-53740/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-53740
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-53740
- OSV: https://osv.dev/vulnerability/CVE-2026-53740

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-53740/
Summaries are generated and may contain mistakes; the official description above is the record.