What is CVE-2020-17476?

CVE-2020-17476 is a medium-severity vulnerability in Mibew Messenger, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-08-10.

How severe is CVE-2020-17476?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Mibew Messenger

CVE-2020-17476

Mibew Messenger before 3.2.7 allows XSS via a crafted user name.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-08-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (50.9th percentile), scored 2026-10-05.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 50.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Mibew Messenger

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

mibew.org/announcements/2020/07/09/mibew-messenger-3-2-7-has-been-released (Release Notes, Vendor Advisory)
github.com/Mibew/mibew/commit/84f5bca0a90b2fe470e35e9b5121548ccce0093c (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2020-17476?: CVE-2020-17476 is a medium-severity vulnerability in Mibew Messenger, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-08-10.
How severe is CVE-2020-17476?: Medium severity. CVSS v3 base score is 6.1 out of 10.