Deserialization in Eventprime

CVE-2026-56053

Subscriber PHP Object Injection in EventPrime <= 4.3.4.1 versions.

Vulnerability class: Insecure Deserialization

Published · last modified .

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.005 (41.7th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 41.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-56053: held from 0.005 to 0.005.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-56053?
CVE-2026-56053 is a high-severity vulnerability in Eventprime, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2026-06-25.
How severe is CVE-2026-56053?
High severity. CVSS v3 base score is 8.8 out of 10.