9.8

CVE-2026-54806: melapress wp_activity_log Deserialization of Untrusted Data

CVSS: 9.8v3.1CriticalDeferred
Published 17-06-2026Last modified 17-06-2026
Open JSON

Vulnerability summary

CVE-2026-54806 is a critical (CVSS 9.8) Deserialization of Untrusted Data vulnerability in melapress wp_activity_log. EPSS estimates a 0.64% chance of exploitation in the next 30 days, higher than 49.7% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.64%
0%100%
Low · -0.06 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 17-06-2026
    PublishedVulnerability first disclosed.
  2. 17-06-2026
    Last modifiedVulnerability information updated.

Description

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

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.64%

Chance of exploitation in the next 30 days

Percentile

50%

Versus all other CVEs

30-day change

-0.06 pp

From 0.70% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.64%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Melapress1 product
Wordpress1 product
  • wp-security-audit-log≤ 5.6.3.1 (fixed in 5.6.4)

2 vendors · 2 products

References

2 links