CVE-2026-0800

User Submitted Posts – Enable Users to Submit Posts from the Front End <= 20251210 - Unauthenticated Stored Cross-Site Scripting via Custom Field

2026-01-23 19:55
Balamurugan R

Strategic Overview

Status
Patched in 20260110
Affected Plugin
User Submitted Posts – Enable Users to Submit Posts from the Front End
Affected Version
<= 20251210
CVSS
7.2High
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE-2026-0800
View all User Submitted Posts – Enable Users to Submit Posts from the Front End vulnerabilities

At a glance

CVE-2026-0800 is a high-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the User Submitted Posts WordPress plugin, affecting versions <= 20251210. It carries a CVSS score of 7.2 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 20260110; sites on affected versions should update now. Disclosed January 2026, reported by Balamurugan R.

Vulnerability Overview

The User Submitted Posts – Enable Users to Submit Posts from the Front End plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the custom fields in all versions up to, and including, 20251210 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

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 privileges on the target site, and no interaction from a victim user.

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Reaching this weakness in User Submitted Posts <= 20251210 takes no account at all. 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 User Submitted Posts the fix is 20260110: builds <= 20251210 are affected, anything from 20260110 onward is not.

Remediation

Update to version 20260110, or a newer patched version

How does WordSec protect against this?

Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: User Submitted Posts 20260110 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-0800https://www.wordfence.com/threat-intel/vulnerabilities/id/1ec907bc-bd10-4dc5-be35-4f2aaf5ef444https://nvd.nist.gov/vuln/detail/CVE-2026-0800

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C