Critical severity · published Jun 17, 2026
CVE-2026-54806
WordPress WP Activity Log plugin <= 5.6.3.1 - PHP Object Injection vulnerability
9.8
CVSS
0.7%
EPSS
No
On KEV
Description
Unauthenticated PHP Object Injection in WP Activity Log <= 5.6.3.1 versions.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 53% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WA
WP Activity Log · Melapress
through 5.6.3.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-54806
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-54806
patchstack.com
https://patchstack.com/database/wordpress/plugin/wp-security-audit-log/vulnerability/wordpress-wp-activity-log-plugin-5-6-3-1-php-object-injection-vulnerability?_s_id=cve
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