CVE-2026-88903: CWE-79 Cross-Site Scripting (XSS) in Topcontent
Description
The Topcontent WordPress plugin through 1.2.1 does not properly authorise one of its request handlers and disables HTML sanitisation before storing the submitted content, allowing unauthenticated attackers to publish arbitrary posts containing malicious JavaScript on any site where its API key has never been configured.
CVSS v3.1
Score 8.8high
Affected software
Topcontent
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-88903 is a cross-site scripting (CWE-79) vulnerability in the Topcontent WordPress plugin through version 1.2.1. The vulnerability occurs due to improper authorization of a request handler combined with disabled HTML sanitization before storing user-submitted content. This allows unauthenticated attackers to inject and publish arbitrary posts with malicious JavaScript on affected sites lacking a configured API key.
Potential Impact
An attacker can exploit this vulnerability to inject malicious JavaScript into posts on affected WordPress sites, potentially leading to client-side script execution in users' browsers. This could facilitate attacks such as session hijacking, defacement, or distribution of malware. The vulnerability affects sites where the Topcontent plugin is installed with versions up to 1.2.1 and the API key has never been configured.
Mitigation Recommendations
No official patch or fix is currently documented. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, site administrators should consider disabling or removing the Topcontent plugin if the API key is not configured, or restrict access to the affected request handlers. Monitor vendor channels for updates and apply patches promptly once released.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-09-10T12:14:29.360Z
- State
- PUBLISHED
Threat ID: 6acb2de52cdf04f656b78d13
Added to database: 10/11/2026, 06:34:13 UTC
Last enriched: 10/11/2026, 06:49:08 UTC
Last updated: 10/11/2026, 21:33:29 UTC
Views: 18
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