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.
- 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
- None listed
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
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.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-53740 being exploited?
There is no known exploitation of CVE-2026-53740 in the wild and no public exploit code.
Sources
Also known as GHSA-c45g-9264-93f4.