CVE-2026-109998

7.2High

Published 16 Oct 2026 · NVD status: Deferred · AI triage by gemini-3.8-flash

7.2High

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Impact: Limited impact
Weakness: CWE-79

Impact

Unauthenticated remote attackers can inject arbitrary JavaScript into pages that executes when users view them. An attacker only needs network access to the public AJAX endpoint without credentials.

Root cause

The wp_ajax_nopriv_mb_template AJAX handler skips nonce verification for content_reply, lacks input/output escaping on the content parameter, and serves JSON with a text/html content type.

Affected systems

Mang Board plugin for WordPress up to, and including, 2.4.3

CVSS v3.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Fix & remediation

Upgrade Mang Board to a version above 2.4.3 once available; if a patched version is not yet released, deactivate the plugin or block unauthenticated requests to admin-ajax.php with action=mb_template at the WAF/web server level.

shell

$ wp plugin deactivate mangboard

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

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NVD description

The Mang Board plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'content' parameter in all versions up to, and including, 2.4.3 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. This is exploitable because the wp_ajax_nopriv_mb_template endpoint is publicly accessible without authentication, nonce verification is not enforced for the content_reply mode, and admin-ajax.php responds with Content-Type: text/html, causing browsers to execute injected tags embedded in the JSON response body.

References

Source: nvd.nist.gov/vuln/detail/CVE-2026-109998