What is CVE-2025-56422?

CVE-2025-56422 is a critical-severity vulnerability in Limesurvey, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-03-10.

How severe is CVE-2025-56422?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Deserialization in Limesurvey

CVE-2025-56422

A deserialization vulnerability in LimeSurvey before v6.15.0+250623 allows a remote attacker to execute arbitrary code on the server.

Vulnerability class: Insecure Deserialization

Published 2026-03-10 · last modified 2026-07-05.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (56.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 56.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Limesurvey

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

limesurvey.com (Product)
github.com/hongancalif/security-advisories/blob/main/CVE-2025-56422.md (Third Party Advisory)

Frequently asked questions

What is CVE-2025-56422?: CVE-2025-56422 is a critical-severity vulnerability in Limesurvey, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-03-10.
How severe is CVE-2025-56422?: Critical severity. CVSS v3 base score is 9.8 out of 10.