CVE-2026-81278: WordPress Post SMTP plugin 4.0.0-beta.1 - Settings Change vulnerability

Medium severity · published Aug 31, 2026

CVE-2026-81278

WordPress Post SMTP plugin 4.0.0-beta.1 - Settings Change vulnerability

5.4

CVSS

0.3%

EPSS

On KEV

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.

CVSS vector

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

Attack vector

Network

Complexity

Low

Privileges

Low

User interaction

None

Confidentiality

None

Integrity

Low

Availability

Low

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.3% · higher than 21% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

Post SMTP · WPExperts

4.0.0 through beta.1 · source: vendor

Affected product

Post SMTP

WPExperts

All Post SMTP CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-81278

CVE.org

https://www.cve.org/CVERecord?id=CVE-2026-81278

patchstack.com

https://patchstack.com/database/wordpress/plugin/post-smtp/vulnerability/wordpress-post-smtp-plugin-4-0-0-beta-1-settings-change-vulnerability?_s_id=cve