XSS in Mattermost

CVE-2023-1776

Boards in Mattermost allows an attacker to upload a malicious SVG image file as an attachment to a card and share it using a direct link to the file.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.004 (36.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N.

Affected products

Mattermost — versions 3.3.0, 7.8.0, 7.7.2
Mattermost Mattermost_server — versions 7.7.1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

responsibledisclosure@mattermost.com (Vendor Advisory)

Frequently asked questions

What is CVE-2023-1776?: CVE-2023-1776 is a high-severity vulnerability in Mattermost, classified under Cross-site Scripting. CVSS score: 7.3/10. Published 2023-03-31.
How severe is CVE-2023-1776?: High severity. CVSS v3 base score is 7.3 out of 10.