Vulnerability · Published Jun 17, 2026 · Assigned by Patchstack
CVE-2026-54806WordPress WP Activity Log plugin <= 5.6.3.1 - PHP Object Injection vulnerability
Critical 9.8
In plain English
A critical-severity unsafe deserialization in WP Activity Log from Melapress. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.7%top 46.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC
Official description
Unauthenticated PHP Object Injection in WP Activity Log <= 5.6.3.1 versions.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Melapress | WP Activity Log | n/a – through 5.6.3.1 |
Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H