A HIGH-severity vulnerability identified as CVE-2026-5200 has been published on May 20, 2026 with a CVSS base score of 8.8. This security advisory provides a detailed breakdown of the vulnerability, its potential impact, weakness classification, and actionable steps to protect your systems.
Vulnerability Details
CVE ID: CVE-2026-5200
Severity: HIGH
CVSS Score: 8.8
Published: May 20, 2026
Weakness (CWE): CWE-862
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | Low |
| User Interaction | None |
| Confidentiality Impact | High |
| Integrity Impact | High |
| Availability Impact | High |
Technical Description
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.
Potential Impact
If exploited, this high-severity vulnerability could allow an attacker to compromise sensitive data confidentiality, tamper with system integrity, cause a denial of service. Organizations running affected software should treat this as a priority remediation item.
Recommended Action
No official patch is available yet. Until one is released:
- Monitor the official NVD page and vendor channels for patch announcements.
- Restrict access to the affected system or service where possible.
- Apply network-level mitigations such as firewall rules or WAF policies.
- Enable logging and alerting for anomalous activity related to this vulnerability.
- Review your incident response plan in case of active exploitation.
References
Related Security Advisories
- [HIGH] CVE-2026-42377 — CVSS 7.3 (April 29, 2026) — HIGH / CVSS 7.3
- [HIGH] CVE-2026-25312 — CVSS 7.5 (March 19, 2026) — HIGH / CVSS 7.5
- [HIGH] CVE-2026-47314 — CVSS 7.8 (May 19, 2026) — HIGH / CVSS 7.8
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