Is CVE-2026-54806 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-54806 being exploited in the wild.

How severe is CVE-2026-54806?

Critical severity, with a CVSS score of 9.8, published 17 June 2026.

Which products and versions are affected?

Melapress WP Activity Log <= 5.6.3.1.

Is there a fix for CVE-2026-54806?

A patch was published on 2026-06-17: Patch confirmed available in version 5.6.4 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-54806 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-54806?

Check whether you run Melapress WP Activity Log at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-54806: Melapress WP Activity Log PHP object injection

Q: Is there a fix for CVE-2026-54806?

A patch was published on 2026-06-17: Patch confirmed available in version 5.6.4 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-54806 attacked?

It is attacked over the network, in a network appliance.

Q: Am I affected by CVE-2026-54806?

Check whether you run Melapress WP Activity Log at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-54806 · Severity: critical · CVSS 9.8 · Published 2026-06-17

WP Activity Log is a popular WordPress plugin used to track and log user activity on websites. A critical security flaw allows unauthenticated attackers to inject malicious code into the site. If exploited, this could lead to full site takeover, data theft, or complete service disruption.

Technologies: Melapress WP Activity Log. Vendors: Melapress.

Quick answers

Is CVE-2026-54806 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-54806 being exploited in the wild.
How severe is CVE-2026-54806?: Critical severity, with a CVSS score of 9.8, published 17 June 2026.
Which products and versions are affected?: Melapress WP Activity Log <= 5.6.3.1.
Is there a fix for CVE-2026-54806?: A patch was published on 2026-06-17: Patch confirmed available in version 5.6.4 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-54806 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-54806?: Check whether you run Melapress WP Activity Log at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The WP Activity Log plugin for WordPress is vulnerable to PHP Object Injection in versions up to and including 5.6.3.1. This issue stems from the insecure deserialization of untrusted data (CWE-502). An unauthenticated remote attacker can exploit this by sending specially crafted input to the application. If a suitable Property-Oriented Programming (POP) chain is present on the server, the attacker can achieve remote code execution, perform SQL injection, or access sensitive files. The vulnerability is resolved in version 5.6.4.

Affected products

Melapress WP Activity Log <= 5.6.3.1

Timeline

2026-05-21: other: Reported by researcher daroo
2026-06-16: advisory: Patchstack advisory published
2026-06-17: disclosed: NVD publication date
2026-06-17: patched: Patch confirmed available in version 5.6.4

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.