What is CVE-2020-35563?

CVE-2020-35563 is a medium-severity vulnerability in Mbconnectline Mbconnect24, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-02-16.

How severe is CVE-2020-35563?

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

XSS in Mbconnectline Mbconnect24

CVE-2020-35563

An issue was discovered in MB CONNECT LINE mymbCONNECT24 and mbCONNECT24 through 2.6.2. There is an incomplete XSS filter allowing an attacker to inject crafted malicious code into the page.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-02-16 · 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 (42.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

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

Affected products

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

mbconnectline.com/security-advice/ (Vendor Advisory)
cert.vde.com/de-de/advisories/vde-2021-003 (Third Party Advisory)

Frequently asked questions

What is CVE-2020-35563?: CVE-2020-35563 is a medium-severity vulnerability in Mbconnectline Mbconnect24, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-02-16.
How severe is CVE-2020-35563?: Medium severity. CVSS v3 base score is 5.4 out of 10.