CVE-2026-28181

AcyMailing SMTP Newsletter <= 10.11.1 - Missing Authorization

2026-08-13 00:00

Strategic Overview

Status: Patched in 11.0.0
Affected Plugin: AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress
Affected Version: <= 10.11.1
CVSS: 4.3Medium
Weakness type: CWE-862 · Missing Authorization
CVE: CVE-2026-28181

View all AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress vulnerabilities

At a glance

CVE-2026-28181 is a medium-severity Missing Authorization vulnerability in the AcyMailing WordPress plugin, affecting versions <= 10.11.1. It carries a CVSS score of 4.3 (reachable over the network; low attack complexity). The root cause is a missing authorization check on a reachable function. The issue is fixed in version 11.0.0; sites on affected versions should update now. Disclosed August 2026, reported by Asim Alshaya.

Vulnerability Overview

The AcyMailing SMTP Newsletter plugin for WordPress is vulnerable to unauthorized access due to a missing capability check on a function in versions up to, and including, 10.11.1. This makes it possible for authenticated attackers, with subscriber-level access and above, to perform an unauthorized action.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user.

CWE-862: Missing Authorization

Reaching this weakness in AcyMailing <= 10.11.1 takes a caller who can reach the endpoint. A missing authorization check means a function is reachable by anyone who can reach the endpoint, because the code never asks whether the caller is allowed to perform the action.

Any user who can reach the endpoint gets to run an action reserved for higher-privileged roles, from reading protected data to changing settings or content. For AcyMailing the fix is 11.0.0: builds <= 10.11.1 are affected, anything from 11.0.0 onward is not.

Remediation

Update to version 11.0.0, or a newer patched version

How does WordSec protect against this?

Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: AcyMailing 11.0.0 closes this, and updating the plugin is the step that ends it.

Login Security
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-28181 https://www.wordfence.com/threat-intel/vulnerabilities/id/894ad797-5143-4493-a3d6-29b22cee1cc6 https://nvd.nist.gov/vuln/detail/CVE-2026-28181

Related records

Same weakness class

Other vulnerabilities in AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress

CVSS Vector

4.3

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityLow
AvailabilityNone

This record contains material that is subject to copyright

CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.

https://www.cve.org/Legal/TermsOfUse

Defiant hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute this software vulnerability information. Any copy of the software vulnerability information you make for such purposes is authorized provided that you include a hyperlink to this vulnerability record and reproduce Defiant's copyright designation and this license in any such copy.

https://www.wordfence.com/wordfence-intelligence-terms-and-conditions/