What is CVE-2022-40778?

CVE-2022-40778 is a medium-severity vulnerability in Opswat Metadefender, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2022-09-19.

How severe is CVE-2022-40778?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Opswat Metadefender

CVE-2022-40778

A stored Cross-Site Scripting (XSS) vulnerability in OPSWAT MetaDefender ICAP Server before 4.13.0 allows attackers to execute arbitrary JavaScript or HTML because of the blocked page response.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2022-09-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (38.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.000

Affected products

Opswat Metadefender

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.opswat.com/products/metadefender/icap (Product, Vendor Advisory)
docs.opswat.com/mdicap/release-notes (Vendor Advisory)

Frequently asked questions

What is CVE-2022-40778?: CVE-2022-40778 is a medium-severity vulnerability in Opswat Metadefender, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2022-09-19.
How severe is CVE-2022-40778?: Medium severity. CVSS v3 base score is 5.4 out of 10.