CVE-2026-77807

AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress <= 11.0.4 - Unauthenticated Arbitrary File Read via 'user[name]' Parameter

2026-09-10 11:10
daroo

Strategic Overview

Status
Patched in 11.0.5
Affected Plugin
AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress
Affected Version
<= 11.0.4
CVSS
7.5High
Weakness type
CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CVE
CVE-2026-77807
View all AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress vulnerabilities

At a glance

CVE-2026-77807 is a high-severity Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in the AcyMailing WordPress plugin, affecting versions <= 11.0.4. It carries a CVSS score of 7.5 (reachable over the network; low attack complexity; high confidentiality impact). Exploitation requires no authentication. The issue is fixed in version 11.0.5; sites on affected versions should update now. Disclosed September 2026, reported by daroo.

Vulnerability Overview

The AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress plugin for WordPress is vulnerable to Directory Traversal in all versions up to, and including, 11.0.4 via the `user[name]` Parameter. This makes it possible for unauthenticated attackers to read the contents of arbitrary files on the server, which can contain sensitive information. Exploitation requires "Embed images" option in AcyMailing configuration being enabled.

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 privileges on the target site, and no interaction from a victim user. A successful exploit has high impact on confidentiality.

CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Reaching this weakness in AcyMailing <= 11.0.4 takes no account at all. Path traversal happens when user-controlled text is used to build a filesystem path without being constrained to an intended directory, so sequences like ../ walk the resolved path somewhere else.

Depending on the operation, it means reading files outside the intended folder — wp-config.php being the usual target — or writing to and deleting paths the web server can touch. For AcyMailing the fix is 11.0.5: builds <= 11.0.4 are affected, anything from 11.0.5 onward is not.

Remediation

Update to version 11.0.5, or a newer patched version

How does WordSec protect against this?

Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: AcyMailing 11.0.5 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-77807https://www.wordfence.com/threat-intel/vulnerabilities/id/19a9b952-84db-4911-bb50-52d74ec01cb8https://nvd.nist.gov/vuln/detail/CVE-2026-77807

Related records

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