CVE-2026-116535

SEOPress <= 10.3 - Authenticated (Subscriber+) Stored Cross-Site Scripting via 'display_name' Profile Field via %%archive_title%% Template Tag

2026-10-30 18:56
Yuto Hyakumoto

Strategic Overview

Status
Patched in 10.4
Affected Plugin
SEOPress – AI SEO Plugin & On-site SEO
Affected Version
<= 10.3
CVSS
6.4Medium
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation
CVE
CVE-2026-116535
View all SEOPress – AI SEO Plugin & On-site SEO vulnerabilities

At a glance

CVE-2026-116535 is a medium-severity Improper Neutralization of Input During Web Page Generation vulnerability in the SEOPress WordPress plugin, affecting versions <= 10.3. It carries a CVSS score of 6.4 (reachable over the network; low attack complexity). Exploitation requires an authenticated account at Subscriber level or above. The issue is fixed in version 10.4; sites on affected versions should update now. Disclosed October 2026, reported by Yuto Hyakumoto.

Vulnerability Overview

The SEOPress – AI SEO Plugin & On-site SEO plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'display_name' parameter in all versions up to, and including, 10.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This is exploitable by any Subscriber who sets their display_name to a string containing the literal %%archive_title%% token alongside HTML event-handler payloads, as WordPress stores display names without HTML filtering and the plugin substitutes the token after escaping has already occurred.

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

SEOPress <= 10.3 carries this weakness at display_name, and reaching it takes an account at Subscriber 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 SEOPress the fix is 10.4: builds <= 10.3 are affected, anything from 10.4 onward is not.

Remediation

Update to version 10.4, or a newer patched version

How does WordSec protect against this?

An attacker needs Subscriber 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: SEOPress 10.4 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-116535https://www.wordfence.com/threat-intel/vulnerabilities/id/6651c932-aa60-485b-bb5b-b66d5a8963aehttps://nvd.nist.gov/vuln/detail/CVE-2026-116535

Related records

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