FastX: A security weakness
FastX is affected by a security weakness. Exploitation requires an authenticated subscriber account. The resulting impact depends on how the affected component exposes the vulnerable operation. The published affected range is <= 1.0.2.
- Component
- FastX
- Plugin slug
fastx- Affected
- <= 1.0.2
- Safe version
- See mitigation notes
- Published
- May 22, 2026
- Weakness
- CWE-862 — Missing Authorization
This CVE was published May 22, 2026 and is one of 1 known issue for this theme.
Update, patch or deactivate.
No fixed release is identified. Update FastX when a release after 1.0.2 becomes available; until then, disable and remove it when the site's risk warrants.
No confirmed safe version is listed. Consider a vendor-supported patch or temporarily restricting the affected functionality while you assess the risk.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical description
The FastX theme for WordPress is vulnerable to unauthorized limited plugin installation and activation due to missing capability checks on the 'ultp_install_callback' and 'ultp_activate_callback' functions in all versions up to, and including, 1.0.2. This makes it possible for authenticated attackers, with Subscriber-level access and above, to install and activate the PostX plugin.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N