Yoast Duplicate Post <= 3.2.3 - Authenticated (Admin+) Stored Cross-Site Scripting
Strategic Overview
- Status
- Patched in 3.2.4
- Affected Plugin
- Yoast Duplicate Post
- Affected Version
< 3.2.4- CVSS
- 5.5Medium
- Weakness type
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CVE
CVE-2019-25314
At a glance
CVE-2019-25314 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Yoast Duplicate Post WordPress plugin, affecting versions < 3.2.4. It carries a CVSS score of 5.5 (reachable over the network; low attack complexity). Exploitation requires an authenticated account at Admin level or above. The issue is fixed in version 3.2.4; sites on affected versions should update now. Disclosed September 2019, reported by Unk9vvN.
Vulnerability Overview
The Yoast Duplicate Post plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 3.2.3. This makes it possible for high-level authenticated users, such as administrators, to inject arbitrary web scripts into administrative pages via several parameters such as 'duplicate_post_title_prefix'. This only affects multi-site installations and installations where unfiltered_html has been disabled.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user.
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Yoast Duplicate Post < 3.2.4 carries this weakness at duplicate_post_title_prefix, and reaching it takes an account at Admin level or above. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.
Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Yoast Duplicate Post the fix is 3.2.4: builds < 3.2.4 are affected, anything from 3.2.4 onward is not.
Remediation
Update to version 3.2.4, or a newer patched version
How does WordSec protect against this?
An attacker needs Admin access first, so the firewall sees the attempt as traffic from a logged-in account: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Yoast Duplicate Post 3.2.4 closes this, and updating the plugin is the step that ends it.
- Firewall
- Alerts
External References
Related records
Same weakness class
Other vulnerabilities in Yoast Duplicate Post
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