CVE-2026-5200

AcyMailing <= 10.8.2 - Missing Authorization to Authenticated (Subscriber+) Privilege Escalation via 'acymailing_router'

2026-05-19 18:19
Azril Fathoni (kiseki)

Strategic Overview

Status
Patched in 10.9.0
Affected Plugin
AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress
Affected Version
<= 10.8.2
CVSS
8.8High
Weakness type
CWE-862 · Missing Authorization
CVE
CVE-2026-5200
View all AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress vulnerabilities

At a glance

CVE-2026-5200 is a high-severity Missing Authorization vulnerability in the AcyMailing WordPress plugin, affecting versions <= 10.8.2. It carries a CVSS score of 8.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires an authenticated account at Subscriber level or above. The issue is fixed in version 10.9.0; sites on affected versions should update now. Disclosed May 2026, reported by Azril Fathoni (kiseki).

Vulnerability Overview

The AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress plugin for WordPress is vulnerable to Missing Authorization in versions up to, and including, 10.8.2. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with subscriber-level access and above, to modify privileged AcyMailing configuration, export subscriber secret keys, and chain these actions into administrator account takeover when a target administrator email address is known.

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. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.

CWE-862: Missing Authorization

Reaching this weakness in AcyMailing <= 10.8.2 takes an account at Subscriber level or above. 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 10.9.0: builds <= 10.8.2 are affected, anything from 10.9.0 onward is not.

Remediation

Update to version 10.9.0, 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 10.9.0 closes this, and updating the plugin is the step that ends it.

  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-5200https://www.wordfence.com/threat-intel/vulnerabilities/id/f8470662-2247-4159-9dac-f13677c94bdfhttps://nvd.nist.gov/vuln/detail/CVE-2026-5200

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C