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Vulnerability record · CVE-2026-4297 · published 24 June 2026

CVE-2026-4297: Missing authorization vulnerability

The Welcome Software Publishing plugin for WordPress is vulnerable to Arbitrary Options Update in all versions up to and including 0.0.31. This is due to a missing capability check in the nc_setOption() function, which is exposed via the nc.setOption XML-RPC method. The function authenticates the user via $wp_xmlrpc_server->login() (verifying credentials are valid) but does not perform any authorization check such as current_user_can('manage_options'). This makes it possible for authenticated attackers, with Subscriber-level access and above, to update arbitrary WordPress options via XML-RPC requests. This can be leveraged to change the default_role option to 'administrator' and then register a new administrator account, achieving full privilege escalation and site takeover.

8.8 CVSS 3.1 High EPSS 0.67% · top 50.0% CWE-862 · Missing authorization Deferred
8.8CVSS 3.1 base score
0.67%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
9References
25 Jun 2026Last modified by NVD

Description

The Welcome Software Publishing plugin for WordPress is vulnerable to Arbitrary Options Update in all versions up to and including 0.0.31. This is due to a missing capability check in the nc_setOption() function, which is exposed via the nc.setOption XML-RPC method. The function authenticates the user via $wp_xmlrpc_server->login() (verifying credentials are valid) but does not perform any authorization check such as current_user_can('manage_options'). This makes it possible for authenticated attackers, with Subscriber-level access and above, to update arbitrary WordPress options via XML-RPC requests. This can be leveraged to change the default_role option to 'administrator' and then register a new administrator account, achieving full privilege escalation and site takeover.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
https://plugins.trac.wordpress.org/browser/newscred-publishing/tags/0.0.31/newscred.php#L264
https://plugins.trac.wordpress.org/browser/newscred-publishing/tags/0.0.31/newscred.php#L265
https://plugins.trac.wordpress.org/browser/newscred-publishing/tags/0.0.31/newscred.php#L272
https://plugins.trac.wordpress.org/browser/newscred-publishing/tags/0.0.31/newscred.php#L44
https://plugins.trac.wordpress.org/browser/newscred-publishing/trunk/newscred.php#L264
https://plugins.trac.wordpress.org/browser/newscred-publishing/trunk/newscred.php#L265
https://plugins.trac.wordpress.org/browser/newscred-publishing/trunk/newscred.php#L272
https://plugins.trac.wordpress.org/browser/newscred-publishing/trunk/newscred.php#L44
https://www.wordfence.com/threat-intel/vulnerabilities/id/47e53fd3-4e3f-433a-8e70-3a58c864184a?source=cve

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Source: NIST National Vulnerability Database (record CVE-2026-4297), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.