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CVE-2026-54806

WordPress WP Activity Log plugin <= 5.6.3.1 - PHP Object Injection vulnerability

9.8 CriticalPublic exploit

CVE-2026-54806 is a critical vulnerability (CVSS 9.8) in Melapress Wp Activity Log, published June 17, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.70%, the 53rd percentile. No source names a fixed version.

What does this mean?
Severity
9.8 CriticalCVSS 3.1, CVE List
Exploit chance
0.70%EPSS, 53rd percentile
Exploitation
None known1 public exploit
Fixed in
No fix listedNo source names one

Description

Unauthenticated PHP Object Injection in WP Activity Log <= 5.6.3.1 versions.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.70%Up 0.2 points since Jun 18, 2026
90%50%10%1%

Affected products

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
PoC in GitHubjoshuavanderpoll/CVE-2026-548062026-06-22

What each source reports

CVE List Score used9.8

WordPress WP Activity Log plugin <= 5.6.3.1 - PHP Object Injection vulnerability

Unauthenticated PHP Object Injection in WP Activity Log <= 5.6.3.1 versions.

Record
CVE-2026-54806
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-502
Updated
2026-11-02
EUVDEUVD-2026-376429.8

Unauthenticated PHP Object Injection in WP Activity Log <= 5.6.3.1 versions.

Record
EUVD-2026-37642
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-5hfr-j85r-7cqx9.8

Unauthenticated PHP Object Injection in WP Activity Log <= 5.6.3.1 versions.

Unauthenticated PHP Object Injection in WP Activity Log <= 5.6.3.1 versions.

Record
GHSA-5hfr-j85r-7cqx
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-502
Updated
2026-11-02
NVD9.8

Unauthenticated PHP Object Injection in WP Activity Log <= 5.6.3.1 versions.

Record
CVE-2026-54806
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-502
Updated
2026-11-02

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

References

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