Post SMTP permits low-privilege settings changes
Post SMTP 4.0.0 through beta.1 does not enforce the required authorization on a settings-changing operation. A low-privilege authenticated user can alter protected settings and disrupt affected mail functionality.
- Component
- Post SMTP
- Plugin slug
post-smtp- Affected
- 4.0.0 through beta.1
- Safe version
4.0.1- Published
- Aug 31, 2026
- Weakness
- CWE-862 — Missing Authorization
This CVE was published Aug 31, 2026 and is one of 29 known issues for this plugin.
Update, patch or deactivate.
Update Post SMTP to 4.0.1 or later and review configuration changes and activity by low-privilege accounts.
A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.
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
Missing Authorization vulnerability in WPExperts Post SMTP allows Exploiting Incorrectly Configured Access Control Security Levels. This issue affects Post SMTP: from 4.0.0 through beta.1.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L